MICHIGAN POTATO RESEARCH REPORT

Transcription

1 AGRICULTURAL EXPERIMENT STATION IN COOPERATION WITH THE MICHIGAN POTATO INDUSTRY COMMISSION MICHIGAN POTATO RESEARCH REPORT Volume 5 Click Here to Open the Potato Research Report

2 INTRODUCTION POTATO VARIETY EVALUATIONS Funding: Fed. Grant/MPIC D.S. Douches, J. Coombs, L. Frank, J. Driscoll, J. Estelle, K. Zarka, R. Hammerschmidt and W. Kirk Departments of Crop and Soil Sciences and Plant Pathology Michigan State University East Lansing, MI 4884 Each year we conduct a series of variety trials to assess advanced potato selections from the Michigan State University and other potato breeding programs. The objectives of the evaluations are to identify superior varieties for fresh market or for processing and to develop recommendations for the growing of those varieties. The varieties were compared in groups according to the tuber type and skin color and to the advancement in selection. Each season, total and marketable yields, specific gravity, tuber appearance, incidence of external and internal defects, chip color (from field, 4 F and 5 F storage), as well as susceptibilities to late blight (foliar and tuber), common scab, and blackspot bruising are determined. PROCEDURE Eight field experiments were conducted at the Montcalm Research Farm in Entrican, MI. They were planted as randomized complete block designs with four replications. The plots were feet long and spacing between plants was inches. Interrow spacing was 4 inches. Supplemental irrigation was applied as needed. This year the new land which was leased to MSU was used for the field trials. The round white tuber types were divided into chipprocessors and tablestock and were harvested at two dates (DateofHarvest trial: Early and Late). The other field experiments were the Russet, North Central Regional, Adaptation (tablestock and chipprocessors), and Preliminary (tablestock and chipprocessors) trials. In each of these trials, the yield was graded into four size classes, incidence of external and internal defects in >.5 in. diameter or oz. potatoes were recorded, and samples for specific gravity, chipping, disease tests, bruising, and cooking tests were taken. Chip quality was assessed on 5tuber samples, taking two slices from each tuber. Chips were fried at 65 F. The color was measured visually with the SFA 5 color chart. Tuber samples were also stored at 4 F and 5 F for chipprocessing out of storage in January and March. Advanced selections are also placed in the Commercial Demonstration Storage for monthly sampling. The scab nursery at the MSU Soils Farm and the late blight trial at the Muck Soils Research Farm are used for scab and foliar late blight assessment of lines in the agronomic trials. 8

3 RESULTS A. Round White Varieties: Chipprocessors (Tables and ) There were 7 entries that were compared at two harvest dates. Atlantic, Snowden and four Frito Lay clones were used as checks. The plot yields were below average in the early harvest (99 days), and most lines increased between 65 cwt/a in yield for the second harvest date (45 days). The results are summarized in Tables and. Tuber specific gravity readings were significantly average to above average for. Incidence of internal defects was generally low, but Atlantic and Snowden had a higher frequency of hollow heart in both early and late harvests. In the early harvest trial, MSJ47 had the highest yield, while FL8, MSH6 and AC874 W were similar in yield behind MSJ47. At the later harvest, different lines were found at the top tier for yield. MSG7 and MSJ46 were new additions, along with AC874W and MSH6. MSF78 (Boulder), MSF99 and MSH6 were also high in specific gravity along with Atlantic, MSH67, and MSH954. MSF99 and UEC were also the top yielding lines in the onfarm processing trials. MSJ46 is a promising chipprocessing line with strong foliar resistance to late blight. It also has tablestock cooking quality. Liberator, Pike and MSG7 continue to be the lines with the highest scab resistance along with chipprocessing ability. UEC, Dakota Pearl and FL9 demonstrated scab tolerance in. Chipprocessing quality was high among all the entries in the outofthefield samples. UEC, Liberator and W are in the 5 cwt bins of the Commercial Demonstration Storage this year. Variety Characteristics LIBERATOR a MSU selection for chipprocessing with strong scab resistance. Yield and specific gravity over the past 6 years were comparable to Snowden. It has performed well in other states (Nebraska, Pennsylvania and California). It was in the national SFA and the North Central regional trials. Liberator was released in and is in the Commercial Demonstration Storage. MSG7 a MSU chipprocessing selection with strong scab resistance. It has a specific gravity acceptable for chipprocessing, excellent chip quality and coldchipping potential. The tubers are smoothshaped with a flattened round appearance that is attractive. It has chipprocessed well from the 4 F MPIC demonstration storage studies. It has yielded well in some onfarm trials. This line will be considered for release in 4. MSF99 a MSU chipprocessing selection. It has high specific gravity, smooth attractive tubers, and excellent chip quality and will chipprocess from 45 F cold storage. In it was one of the best chipprocessors in the 4 F MPIC demonstration storage. It yielded well on the onfarm trials, but the large tubers tended to elongate. It is also scab susceptible. MSF99 is in the and Commercial Demonstration Storage. MSJ46 an exciting, new MSU chipprocessing selection with strong foliar resistance to late blight and maturity similar to Snowden. It has excellent chipprocessing quality, smooth round shape and average yield, but an intermediate specific gravity. Has good tablestock quality too. 9

4 UEC an unknown eastern chip processing line thought to be from USDABeltsville. It has high yield potential and scab tolerance along with excellent chipprocessing quality. It is in the 5 cwt and Commercial Demonstration Storage bins. Boulder (MSF78) a high yielding selection with acceptable specific gravity for chipprocessing. It will chip outofthefield and from 5 F storage. Produces large tubers with a low incidence of internal defects. Performance is good under dry land conditions. Scab tolerance is intermediate. MSH954 a midseason maturing line with excellent chip quality and bruise susceptibility equal to Snowden. It was comparable to Atlantic for yield and solids at the Montcalm Research Farm. It is intermediate in scab tolerance between Atlantic and MSG7. B. Round White Varieties: Tablestock (Tables and 4) There were 9 entries that were compared at two harvest dates. Onaway was used as a check. The plot yields were average in the early harvest (99 days), and a yield increase was observed for the second harvest date (4 days). Tuber specific gravity readings were average. The results are summarized in Tables and 4. In the early harvest trial, Onaway, Michigan Purple, MSE8, MSE and MSH5 were the top yielding lines. There was very little incidence of internal defects in the early harvest. In the later harvest, MSE8, Onaway, and Michigan Purple were the top yielding lines. Overall, incidence of internal defects was low in comparison to previous years. MSE and Onaway were the only lines to classify as scab tolerant. Jacqueline Lee, MSI5A and MSJ7 are late blight resistant. Michigan Purple is also a strong performing line under dryland conditions. Variety Characteristics MICHIGAN PURPLE a tablestock selection with an attractive purple skin. This selection has high yield potential and the tubers have a low incidence of internal defects. The vine maturity is midseason to midearly. Do not let the tubers oversize. We regard this as a variety that can compete in the red market. MSH5 a MSU tablestock/chip selection with high yield potential, attractive round shape and bright skin. It has also performed well in North Carolina. It is not scab resistant. MSE a MSU tablestock selection. It has high yield potential as seen in the MSU and onfarm trials in other years. General appearance is good, but it has a netted appearance similar to Superior. It has strong resistance to scab. JACQUELINE LEE an MSU oval/oblong tablestock selection with a high tuber set. The tubers have the bright skinned, smooth and attractive appearance that is typical of many European cultivars. The tubers have very low incidence of internal defects and good baking quality. The strength of this selection is its strong foliar resistance to the US8 genotype of late blight. Vine maturity is similar to Snowden. There is interest in California to market this variety.

5 C. Russet Varieties (Table 5) The russet trial had 9 lines evaluated in. GoldRush and Russet were the standard varieties in the trial and the results are summarized in Table 5. Scab resistance was prevalent among the lines tested. Internal quality was high except for hollow heart in CO96RUS and ATX84786RUS. Specific gravity measurements were below average with Russet Burbank and GoldRush having.74 and.68 readings. The yield of the overall trial was below average for. Off type and cull tubers were found in all lines tested with Russet Burbank, ATX84786RU and A95 being the greatest. The earliest maturing lines were MSE98RUS, Silverton Russet and CO9RU. Variety Characteristics MSE98RUS a MSU tablestock selection. The tubers have an attractive russeting and shape. The vine is small which may make this line uncompetitive in small plot trials. The tuber type suggests that it be considered a replacement for Russet Norkotah. The tubers have a clean white flesh that does not darken after cooking. Scab resistance is better than Russet Norkotah. It has performed well in taste tests. MSERUS a MSU dualpurpose russet selection. It has a late maturity and high yield potential. Its specific gravity is equivalent to Russet Burbank and the tubers are long with a lighter, but attractive russet skin. Scab resistance is also high. It performed well in Minnesota in. D. North Central Regional Trial (Table 6) The North Central Trial is conducted in a wide range of environments ( locations) to provide adaptability data for the release of new varieties from North Dakota, Minnesota, Wisconsin, Michigan and Canada. Twentytwo breeding lines and 7 check varieties were tested in Michigan. The results are presented in Table 6. The range of yield was very wide (55 cwt 7 cwt) and specific gravities of the lines were high in. The MSU lines MSG7, MSE, MSE RUS and MSH5 were all included in the North Central Trial. Similar to, ND58C7 was very high yielding, but was susceptible to hollow heart. This line also has some Colorado potato beetle resistance. ND477 was also a high performing line and chipprocessed out of the field. MSG7 and W777 offer good chipprocessing and scab resistance. A94RUS is an excellent russet selection for yield and type. The toprated redskinned line was W75R because of its combination of good skin color, round shape and uniform small red tubers. MSE, a scab resistant MSU tablestock selection, was also a promising selection in the trial. E. Adaptation Trial (Tables 7A and 7B) The Adaptation trial was divided into chipprocessing and tablestock trials. Three cultivars (Snowden, Pike and Atlantic) and 5 advanced breeding lines are reported in the chipprocessing trial. The trial was harvested after 4 days and the results are summarized in Table 7A. The high yielding lines identified in were MSJ6A, MSJ454, MSK498Y and MSL757. The specific gravity readings were high with the check varieties at or above.86. Many MSU selections had specific gravity readings similar or higher than Atlantic. Other lines of interest were

6 observed. MSJ6A, MSK64, MSG9, MSK49 and MSK476 has some scab resistance and chipprocessing ability. MSJ454, MSL757 and MSJ4564 have strong foliar late blight resistance. In the tablestock trial Onaway and Yukon Gold were the check varieties and 7 advanced breeding lines and new varieties are summarized in the table. The trial was harvested after 4 days and the results are summarized in Table 7B. Seven redskinned entries were compared. NDTX475R and ND58RED had the best combination of shape and red skin color. MSI49A was the highest yielding line and was also a strong performing line in the dry land trial. MSK6 is a round white selection with chipprocessing and strong foliar resistance to late blight. MSI5Y is a scab tolerant yellowfleshed selection that shows promise. MSK5 has some late blight tolerance (not resistance) and high yield potential. MSJ4 and MSL75 are round white selections with bright attractive tuber skins and may have some scab tolerance. F. Preliminary Trial (Tables 8A, 8B and 8C) The Preliminary trial is the first replicated trial for evaluating new advanced selections from the MSU potato breeding program. Fiftynine advanced selections and three check varieties were tested and reported in three separate Preliminary trials. The division of the trials was based upon chipprocessing, late blight resistance pedigree and tablestock utilization. The chipprocessing trial is summarized in Table 8A was harvested after 9 days. Most lines chipprocessed well from the field. Specific gravities were high, but yield was below average. The top yielding line was MSK7AY. MSM5, MSM98, MS464, MSL7B and MSM88 are promising lines that demonstrated some scab tolerance along with chipprocessing ability. MSM98 and MSM85 have some tolerance to Colorado potato beetle damage in the field. Table 8B summarizes the chipprocessing lines with late blight resistant pedigrees. This trial was harvested and evaluated after 9 days. Eight of the lines were late blight resistant. Despite the late blight resistance, the vine maturities were not late in all cases. Seven different late blight resistance sources were also represented. The most promising lines combining chipprocessing and late blight resistance are MSM47A, MSL77A, MSK8A and MSL79AY. MSL79AY also has an attractive bright skin that would serve the tablestock market well. Table 8C summarizes the results from the Preliminary tablestock trial. Harvest was completed after days. Of the entries evaluated, had foliar late blight resistance. The most promising lines with late blight resistance were MSM4, MSM7A, MSL59AY and MSL. MSL5ARUS is a russet selection with good type and MSL8 is selection with purple splashes. MSL59AY also chipprocesses out of the field. G. Potato Scab Evaluation (Table 9) Each year a replicated field trial at the MSU Soils Farm is conducted to assess resistance to common and pitted scab. We are using a modified scale of a 5 ranking based upon a combined score for scab coverage and lesion severity. Usually examining one year's data does not indicate which varieties are resistant but it should begin to identify ones that can be classified as susceptible to scab. Our goal is to evaluate important advanced selections and varieties in the study at least three years to obtain a valid estimate of the level of resistance in each line. Table 9 categorizes many of the varieties and advanced selections tested in at the MSU Soils Farm Scab Nursery. This

7 disease trial is a severe test. The varieties and lines are placed into six arbitrary categories based upon scab infection level and lesion severity. A rating of indicates zero infection. A score of. indicates a trace amount of infection. A moderate resistance (..8) correlates with <% infection. Scores of 4. or greater are found on lines with >5% infection and severe pitted lesions. In the scab disease incidence at the nursery was typical compared to other years, and the data were separated into three categories (Resistant =..; Moderately Resistant =..8; and Susceptible = or higher).the check varieties Russet Burbank, GoldRush, Superior, Onaway, Pike, Red Pontiac, Yukon Gold, Atlantic and Snowden can be used as references (bolded in Table 9). This year s results indicate that we have been able to breed numerous lines for the chipprocessing and tablestock markets with resistance to scab. Most notable scab resistant MSU lines are Liberator, MSG7, MSE98RUS, MSERUS, MSE, MSG9, MSH86, MSK49, MSK476, and MSJ6A. The greater number of MSU lines in the resistant and moderately resistant categories indicates we are making progress in breeding more scab resistant lines for the chipprocessing and tablestock markets. Scab results from the disease nursery are also found in the Trial Summaries (Tables, 48C). H. Late Blight Trial (Table ) In, a late blight trial was conducted at the Muck Soils Research Farm. Over entries were evaluated in replicated plots. The field was planted on 4 June and inoculated 5 July with isolate 957, and ratings were taken throughout August. Most lines were highly susceptible to the US8 genotype of late blight. Included in this trial are the varieties and lines from the MSU trials at the Montcalm Research Farm. The partial results are summarized in Table. The first column lists the lines classified as resistant, while the second column lists select varieties that are susceptible. The late blight differential lines LBR8 and LBR9 were resistant in as in previous years (not shown in table). Twentyone MSU lines were highly resistant to late blight. In addition 5 MSU lines (Jacqueline Lee, MSJ46, MSI5A, MSJ7 and MSJ454) were highly resistant in a separate National Breeder Trial. Resistance of the MSU lines is derived from Tollocan (a Mexican variety), B78 (USDA clone), AWN9658 (USDA clone), Stirling (Scottish variety), NY (Cornell University clone) and Jacqueline Lee (MSU variety). These resistant progeny indicate that we can continue to breed for resistance using this group of resistant clones. Some of the most promising late blight resistant clones are MSJ46, MSL59AY, MSL79AY, MSM7A, MSI5A and MSK6. We find these late blight resistant lines valuable because many of them also have marketable maturity. Many of these lines also have other desirable traits such as scab tolerance resistance and/or chipprocessing quality. Tuber late blight resistance is being evaluated on many of the selections with foliar late blight resistance. I. Blackspot Susceptibility (Table ) Increased evaluations of advanced seedlings and new varieties for their susceptibility to blackspot bruising have been implemented in the variety evaluation program over the past decade. Based upon the results collected over the past three years we decided to eliminate the check sample from our bruise assessment. Therefore a composite bruise sample of each line in the trials was collected. The sample consisted of 5 tubers (a composite of 4 reps) from each line at the time of grading. The 5 tuber sample was held in 5 F storage overnight and then was placed in a hexagon plywood drum and tumbled times to provide a simulated bruise. The samples were peeled in an

8 abrasive peeler in October and individual tubers were assessed for the number of blackspot bruises on each potato. These data are shown in Table. The bruise data are represented in two ways: percentage of bruise free potatoes and average number of bruises per tuber. A high percentage of bruisefree potatoes is the desired goal; however, the numbers of blackspot bruises per potato is also important. Cultivars which show blackspot incidence greater than Atlantic are approaching the bruisesusceptible rating. In addition, the data is grouped by trial, since the bruise levels can vary between trials. Conducting the simulated bruise on 5 F tubers is helping to standardize the bruise testing. We are observing less variation between trials since we standardized the handling of the bruise sample. However, these results become more meaningful when evaluated over years that reflects different growing seasons and harvest conditions. In the bruise levels were lower than other years. The most bruise resistant lines this year were FL9, Keystone Russet, GoldRush, Onaway, Silverton Russet, MSERUS, and MSE. The most susceptible lines were MSH954, UEC, Norvalley, FL8, Snowden, Atlantic, Jacqueline Lee and MSI5Y. 4

9 Table ROUND WHITE CHIP POTATOES: EARLY HARVEST MONTCALM RESEARCH FARM AUGUST 4, (99 DAYS) YR AVG CWT/A PERCENT OF TOTAL CHIP TUBER QUALITY TOTAL US# LINE US# TOTAL US# Bs As OV PO SP GR SCORE HH VD IBS BC CUT CWT/A MSJ FL MSH AC874W FL ATLANTIC MSJ FL MSF DAKOTA PEARL * MSG MSF MSH SNOWDEN LIBERATOR UEC * MSH * FL MSJ46 LBR MSH MSH MSH MSJ MEAN LSD * TwoYear Average LBR Line(s) demonstrated foliar resistance to Late Blight ( Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm. SIZE: B: <"; A:.5"; OV: >.5"; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. CHIP SCORE: Snack Food Association Scale (Out of the field); Ratings: 5; : Excellent, 5: Poor. 5 Planted May 7,

10 Table ROUND WHITE CHIP POTATOES: LATE HARVEST MONTCALM RESEARCH FARM SEPTEMBER 9, (45 DAYS) LINE YR AVG CWT/A PERCENT OF TOTAL CHIP TUBER QUALITY TOTAL US# US# TOTAL US# Bs As OV PO SP GR SCORE HH VD IBS BC CUT SCAB 4 MAT 5 CWT/A FL879 AC874W MSJ8 MSF78 ATLANTIC MSH6 MSF99 MSG7 MSJ46 UEC FL8 MSH954 MSH67 MSH86 LIBERATOR MSJ47 SNOWDEN DAKOTA PEARL MSH948 FL9 FL867 MSH6 MSJ * 8 54* MEAN LSD * TwoYear Average LBR Line(s) demonstrated foliar resistance to Late Blight ( Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm. SIZE: B: <"; A:.5"; OV: >.5"; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. CHIP SCORE: Snack Food Association Scale (Out of the field); Ratings: 5; : Excellent, 5: Poor. 4 SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. 5 MATURITY RATING: Taken August 8, ; Ratings 5; : Early (vines completely dead); 5: Late (vigorous vine, some flowering) Planted May 7, 6

11 Table ROUND WHITE TABLESTOCK POTATOES: EARLY HARVEST MONTCALM RESEARCH FARM AUGUST 4, (99 DAYS) YR AVG CWT/A PERCENT OF TOTAL TUBER QUALITY TOTAL US# LINE US# TOTAL US# Bs As OV PO SP GR HH VD IBS BC CUT CWT/A ONAWAY MICHIGAN PURPLE MSE MSH MSE JACQUELINE LEE LBR MSG MSI5A LBR * MSJ MSJ7 LBR MEAN 5.76 LSD * TwoYear Average LBR Line(s) demonstrated foliar resistance to Late Blight ( Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm. SIZE: B: <"; A:.5"; OV: >.5"; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. Planted May 7, 7

12 Table 4 ROUND WHITE TABLESTOCK POTATOES: LATE HARVEST MONTCALM RESEARCH FARM SEPTEMBER 5, (4 DAYS) LINE YR AVG CWT/A PERCENT OF TOTAL TUBER QUALITY TOTAL US# US# TOTAL US# Bs As OV PO SP GR HH VD IBS BC CUT SCAB MAT 4 CWT/A MSE8 ONAWAY MICHIGAN PU MSG5 JACQUELINE L MSJ97 MSI5A LBR MSH5 MSJ7 LBR MSE RPLE EE LBR * MEAN LSD * TwoYear Average LBR Line(s) demonstrated foliar resistance to Late Blight ( Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm SIZE: B: <"; A:.5"; OV: >.5"; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. 4 MATURITY RATING: Taken August 8, ; Ratings 5; : Early (vines completely dead); 5: Late (vigorous vine, some flowering) Planted May 7, 8

13 Table 5 RUSSET TRIAL MONTCALM RESEARCH FARM SEPTEMBER 8, (8 DAYS) LINE YR AVG CWT/A PERCENT OF TOTAL TUBER QUALITY TOTAL US# US# TOTAL US# Bs As OV PO SP GR HH VD IBS BC CUT SCAB 4 MAT 5 CWT/A CO96RU A854BRUS KEYSTONE RUSSET ALTURAS RUSSET RUSSET BURBANK A95 AC89565RU AC969RU A959 CO9RU GOLDRUSH MSE98RUS SILVERTON RUSSET AC994RU ATX8476RU A94 MSERUS CO8564RU ATX84786RU * 66 9 MEAN LSD * TwoYear Average SIZE: B: < 4oz.; A: 4oz.; OV: > oz.; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. 4 SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. 5 MATURITY RATING: Taken August 8, ; Ratings 5; : Early (vines completely dead); 5: Late (vigorous vine, some flowering). 6 BRUISE: These lines demonstrated blackspot bruise susceptibility in simulated bruise testing in. Planted May, 9

14 Table 6 NORTH CENTRAL REGIONAL TRIAL MONTCALM RESEARCH FARM SEPTEMBER, ( DAYS) ENTRY CWT/A PERCENT OF TOTAL CHIP TUBER QUALITY TOTAL US# TOTAL US# Bs As OV PO SP GR SCORE HH VD IBS BC CUT SCAB 4 MAT 5 MERIT 6 ND58C7 RED PONTIAC SNOWDEN ND477 A94RUS W777 MSG7 V56 W CV89R W86RUS MN87RUS UEC ATLANTIC MSE V79 MSH5 PACIFIC RUSSET ( MN56LR MN955R MN8747RUS NORVALLEY MSERUS RED NORLAND ing page: W RUS W W RUS V68) RD continued on follow

15 Table 6 continued NORTH CENTRAL REGIONAL TRIAL MONTCALM RESEARCH FARM SEPTEMBER, ( DAYS) CWT/A PERCENT OF TOTAL CHIP TUBER QUALITY TOTAL ENTRY US# TOTAL US# Bs As OV PO SP GR SCORE HH VD IBS BC CUT SCAB 4 MAT 5 MERIT 6 continued: ND96R RD RUSSET BURBANK W75R RD STAMPEDE RUSSET (AC) RUS RUSSET NORKOTAH MEAN LSD SIZE: B: <"; A:.5"; OV: >.5"; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. CHIP SCORE: Snack Food Association Scale (Out of the field); Ratings: 5; : Excellent, 5: Poor. 4 SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. 5 MATURITY RATING: Taken August 8, ; Ratings 5; : Early (vines completely dead); 5: Late (vigorous vine, some flowering). 6 MERIT: A Merit rating was given for the best entries within each market class (rank order, = best). Planted May,

16 Table 7A ADAPTATION TRIAL, CHIPPROCESSING LINES MONTCALM RESEARCH FARM SEPTEMBER 5, (4 DAYS) CWT/A PERCENT OF TOTAL CHIP TUBER QUALITY TOTAL LINE US# TOTAL US# Bs As OV PO SP GR SCORE HH VD IBS BC CUT SCAB 4 MAT 5 MSJ6A MSJ454 LBR ATLANTIC MSK498Y MSL757 LBR MSJ6A SNOWDEN MSK MSK MSK47A MSK MSJ MSH56A MSG PIKE MSJ4564 LBR MSH MSJ69Y MEAN LSD LBR Line(s) demonstrated foliar resistance to Late Blight (Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm. SIZE: B: <"; A:.5"; OV: >.5"; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. CHIP SCORE: Snack Food Association Scale (Out of the field); Ratings: 5; : Excellent, 5: Poor. 4 SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. 5 MATURITY RATING: Taken August 8, ; Ratings 5; : Early (vines completely dead); 5: Late (vigorous vine, some flowering) Planted May 4,

17 Table 7B ADAPTATION TRIAL, TABLESTOCK LINES MONTCALM RESEARCH FARM SEPTEMBER 5, (4 DAYS) CWT/A PERCENT OF TOTAL CHIP TUBER QUALITY TOTAL LINE US# TOTAL US# Bs As OV PO SP GR SCORE HH VD IBS BC CUT SCAB MAT 4 MSI49A MSK STIRLING LBR NDTX475R MSE495Y ONAWAY MSI5Y CO8997RED NDTX44R MSK6 LBR MSJ CO976RED DAKOTA ROSE NDC58RED MSK MSL A859R YUKON GOLD MSG MSJ6Y MEAN LSD LBR Line(s) demonstrated foliar resistance to Late Blight (Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm. SIZE: B: <"; A:.5"; OV: >.5"; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. 4 MATURITY RATING: Taken August 8, ; Ratings 5; : Early (vines completely dead); 5: Late (vigorous vine, some flowering) Planted May 7,

18 Table 8A PRELIMINARY TRIAL, CHIPPROCESSING LINES MONTCALM RESEARCH FARM SEPTEMBER, (9 DAYS) CWT/A PERCENT OF TOTAL CHIP TUBER QUALITY TOTAL LINE US# TOTAL US# Bs As OV PO SP GR SCORE HH VD IBS BC CUT SCAB 4 MAT 5 MSK7AY MSM ATLANTIC MSK85A SNOWDEN MSM MSK9B MSR MSI MSM MSM8A MSL64A MSM44Y MSM MSL7B MSM MSM44CY MSK7B MSK6B MSM MSM MSM PIKE MSM44Y LBR MSM MSM9Y MEAN LSD LBR Line(s) demonstrated foliar resistance to Late Blight (Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm. SIZE: B: <"; A:.5"; OV: >.5"; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. CHIP SCORE: Snack Food Association Scale (Out of the field); Ratings: 5; : Excellent, 5: Poor. 4 SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. 5 MATURITY RATING: Taken August 8, ; Ratings 5; : Early (vines completely dead); 5: Late (vigorous vine, some flowering) Planted May 4, 4

19 Table 8B PRELIMINARY TRIAL, CHIPPROCESSING LINES WITH LATE BLIGHT RESISTANT PEDIGREES MONTCALM RESEARCH FARM SEPTEMBER, (9 DAYS) CWT/A PERCENT OF TOTAL CHIP TUBER QUALITY TOTAL LINE US# TOTAL US# Bs As OV PO SP GR SCORE HH VD IBS BC CUT SCAB 4 MAT 5 ATLANTIC MSM47A LBR SNOWDEN MSM64Y MSM7D MSL77A LBR MSK7C LBR MSK8A LBR MSK4A LBR MSL45AY LBR MSL79AY LBR MSLB MSL58CY MSM49Y LBR MSL76A PIKE MEAN LSD.5 NS NS.8 LBR Line(s) demonstrated foliar resistance to Late Blight ( Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm. SIZE: B: <"; A:.5"; OV: >.5"; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. CHIP SCORE: Snack Food Association Scale (Out of the field); Ratings: 5; : Excellent, 5: Poor. 4 SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. 5 MATURITY RATING: Taken August 8, ; Ratings 5; : Early (vines completely dead); 5: Late (vigorous vine, some flowering) 5 Planted May 4,

20 Table 8C PRELIMINARY TRIAL, TABLESTOCK LINES MONTCALM RESEARCH FARM SEPTEMBER, ( DAYS) CWT/A PERCENT OF TOTAL CHIP TUBER QUALITY TOTAL LINE US# TOTAL US# Bs As OV PO SP GR SCORE HH VD IBS BC CUT SCAB 4 MAT 5 MSM4 LBR MSM485 LBR MSM7A LBR MSM8 LBR MSM MSK9B ONAWAY MSM MSL75B MSL MSM5A MSLA MSL59AY LBR MSM4CY MSM8 LBR MSM4B MSL LBR A MSL5ARUS MSM88Y A LB LBR A9795LB LBR MSM86EY MEAN LSD LBR Line(s) demonstrated foliar resistance to Late Blight ( Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm. SIZE: B: <"; A:.5"; OV: >.5"; PO: Pickouts. QUALITY: HH: Hollow Heart; BC: Brown Center; VD: Vascular Discoloration; IBS: Internal Brown Spot. CHIP SCORE: Snack Food Association Scale (Out of the field); Ratings: 5; : Excellent, 5: Poor. 4 SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. 5 MATURITY RATING: Taken August 8, ; Ratings 5; : Early (vines completely dead); 5: Late (vigorous vine, some flowering) 6 Planted May 4,

21 Table 9 SCAB DISEASE TRIAL SCAB NURSERY, EAST LANSING, MI Potato Line Mean Rating (5) Worst Rating (5) Potato Line Mean Rating (5) Worst Rating (5) RESISTANT CATEGORY: MODERATELYRESISTANT CATEGORY: A854BRUS. DAKOTA PEARL. A959. FL9. AC89565RU. MSJ6A. AC969RU. MSJ475. LIBERATOR. MSJ69Y. MSG9. MSJ454 LBR. AC994RUS. MSL8. MN87RUS. MSM64Y. MSE98RUS. MSM88. MSERUS. MSM6. SILVERTON RUSSET. MSR6. STAMPEDE RUSSET. UEC. A94.5 ONAWAY.4 ATX84786RU.5 DAKOTA ROSE.5 KEYSTONE RUSSET.5 FL867.5 RUSSET BURBANK.5 MN8747LW.5 MSH86.7 MSL64A.5 MSK49.7 MSM5Y.5 MSL7B.7 PIKE.5 MSL9AY.7 A859R.7 MSL5ARUS.7 A95.7 MSM464.7 ALTURAS RUSSET.7 MSM6.7 FL8.7 RED NORLAND.7 MSG5.7 W777.7 MSH5.7 W86RUS.7 MSH954.7 MSG7.8 MSH56A.7 A94RUS. MSJ4.7 CO96RU. MSJ47.7 GOLDRUSH. MSJ97.7 MN955R. MSJ6A.7 MSE. MSM57A.7 MSH5. MSM58.7 MSI5Y. MSM44Y.7 MSJ4. MSM485 LBR.7 MSK476. ND58C7.7 MSL LBR. NDTX44R.7 MSM5. V68.7 MSM664. W.7 MSM98. CO9RUS.8 4 ND96R. W75R. *SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. LSD.5 =. LBR Line(s) demonstrated foliar resistance to Late Blight ( Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm. 7

22 Table 9 continued SCAB DISEASE TRIAL SCAB NURSERY, EAST LANSING, MI Potato Line Mean Worst Rating Rating (5) (5) Potato Line Mean Rating (5) Worst Rating (5) Potato Line Mean Rating (5) SUSCEPTIBLE CATEGORY: SUSCEPTIBLE CATEGORY: SUSCEPTIBLE CATEGORY: ATX8476Rus. MSK5. A CO976R. MSL766. CO8997R. LADY ROSETTA. 5 ATLANTIC. 4 CV89. 4 MSE8. A LB LBR. MSI5A LBR. MSE495Y. CO8564Rus. MSK9B. MSF78. MICHIGAN PURPLE. 4 MSL45AY LBR. MSG4. MN56R. MSL8A. 4 MSH67. MSH948. MSLA. MSI6. MSH6. MSL77CY. MSJ8. MSH6. MSM7. MSJ88. MSI49A. MSM48. MSJ67. 4 MSJ4564 LBR. MSM5A. 4 MSJ46 LBR. MSK85A. MSM88AY. MSK64. MSM5. MSM44Y LBR. 4 MSK6 LBR. NDC58R. ND477. MSK47A. V56. SPUNTA. 5 MSK469. YUKON GOLD. RED PONTIAC. 4 MSL4. SNOWDEN.4 MSI75. 4 MSL75. JACQUELINE LEE LBR.5 MSK68. 4 MSL75B. MSI.5 MSK48A. 4 MSL58CY. MSK7B.5 MSLB. 4 MSL65BY. MSL757 LBR.5 4 MSM7D. 4 MSL76A. MSM8A.5 MSM85. 5 MSM77. MSM88Y.5 A9795LB LBR.7 4 MSM9Y. SPUNTA G.5 4 MSJ7 LBR.7 4 MSM44CY. SPUNTA G.5 4 B78 LBR 4. 4 MSM47A. AC874W.7 4 MSK4A LBR 4. 4 MSM7A LBR. MSF MSL77A LBR 4. 4 MSM86EY. MSI6B.7 4 MSM47A LBR 4. 5 NDTX475R. MSJ6Y.7 RUSSET NORKOTAH. MSJ44.7 MSJ456Y LBR.7 MSK7C LBR.7 4 MSK6B.7 4 MSK88AY.7 MSK9B.7 4 MSK4Y.7 MSK498Y.7 4 MSL59AY LBR.7 MSL79AY LBR.7 4 MSL75AR.7 MSM8 LBR.7 MSM49Y LBR.7 STIRLING.7 4 *SCAB DISEASE RATING: MSU Scab Nursery; : No Infection; : Low Infection <5%; : Intermediate; 5: Highly Susceptible. LSD.5 =. Worst Rating (5) 8

23 Table LATE BLIGHT VARIETY TRIAL MUCK SOILS RESEARCH FARM RAUDPC LINE MEAN Table LINE RAUDPC MEAN Foliar Resistance Category: Foliar Susceptibility Category (select lines) : A9795LB MSL59AY MSL79AY MSM8 MSL766 MSK8A MSL65BY MSM4B MSM8 STIRLING MSL45AY MSL MSM4 A LB MSL77A MSM7A MSI5A MSK6 MSM5Y MSL Table 8C Table 8C Table 8B Table 8C Table 8B Table 8C Table 7B Table 8B Table 8C Table 8C Table 8C Table 8B Table 8C Tables,4 Table 7B Table 7A SNOWDEN KEYSTONE RUSSET ALTURAS RUSSET FL879 SILVERTON RUSSET GOLDRUSH NORVALLEY FL8 PIKE W UEC RUSSET BURBANK FL867 STAMPEDE RUSSET YUKON GOLD RED NORLAND RUSSET NORKOTAH ATLANTIC ONAWAY FL MSJ454. Table 7A MSK4A 4.5 Table 8B MSK7C 4.6 Table 8B MSM Table 8C LSD Ratings indicate the average plot RAUDPC (Relative Area Under the Disease Progress Curve). Agronomic performance data of this line may be found on the referenced table. potato varieties and advanced breeding lines were tested in all. For brevity purposes, only selected varieties and breeding lines are listed. Varieties and breeding lines with a mean RAUDPC value of 8.4 and less are considered resistant in. Phytopthora infestans isolate 957 was inoculated 5 July. Planted as a randomized complete block design consisting of replications of 4 hill plots on 4 June 9

24 Table BLACKSPOT BRUISE SUSCEPTIBILITY TEST SIMULATED BRUISE SAMPLES* NUMBER OF SPOTS PER TUBER PERCENT (%) BRUISE AVERAGE ENTRY 4 5+ FREE SPOTS/TUBER ROUND WHITES: CHIPPROCESSING LINES FL DAKOTA PEARL AC874W B MSJ LIBERATOR MSH MSJ MSJ46 LBR 5.5 MSF MSH FL MSG MSH MSF MSJ MSH MSH FL SNOWDEN 5 5. ATLANTIC MSH * Twentyfive Asize tuber samples were collected at harvest, held at 5 F at least hours, and placed in a sixsided plywood drum and rotated ten times to produce simulated bruising. Samples were abrasivepeeled and scored on October 4,. The table is presented in ascending order of average number of spots per tuber. LBR Line(s) demonstrated foliar resistance to Late Blight (Phytopthora infestans ) in inoculated field trials in at the MSU Muck Soils Research Farm. 4

25 Table BLACKSPOT BRUISE SUSCEPTIBILITY TEST SIMULATED BRUISE SAMPLES* NUMBER OF SPOTS PER TUBER PERCENT (%) BRUISE AVERAGE ENTRY 4 5+ FREE SPOTS/TUBER ROUND WHITES: TABLESTOCK LINES MSE MICHIGAN PURPLE MSH MSJ7 LBR ONAWAY MSI5A LBR 5.6 MSJ MSG MSE JACQUELINE LEE LBR RUSSET TRIAL ATX8476RU ALTURAS RUSSET 9. KEYSTONE RUSSET 9. A GOLDRUSH 88. MSERUS 88. SILVERTON RUSSET A854BRUS 5 8. AC969RU 88. RUSSET BURBANK 4 8. AC89565RU MSE98RUS CO96RU A ATX84786RU AC994RU A CO8564RU CO9RU

26 Table BLACKSPOT BRUISE SUSCEPTIBILITY TEST SIMULATED BRUISE SAMPLES* NUMBER OF SPOTS PER TUBER PERCENT (%) BRUISE AVERAGE ENTRY 4 5+ FREE SPOTS/TUBER NORTH CENTRAL REGIONAL TRIAL MSERUS RED NORLAND STAMPEDE RUSSET (AC) MN87RUS 9. W75R 9. MN955R 5 8. MN56LR RUSSET NORKOTAH 84. MN8747RUS 84. RED PONTIAC CV89R ND96R MSG MSH PACIFIC RUSSET (V68) RUSSET BURBANK W86RUS A94RUS ND V V ATLANTIC W ND58C W 8.9 MSE NORVALLEY 7 5. B SNOWDEN

27 Table BLACKSPOT BRUISE SUSCEPTIBILITY TEST SIMULATED BRUISE SAMPLES* NUMBER OF SPOTS PER TUBER PERCENT (%) BRUISE AVERAGE ENTRY 4 5+ FREE SPOTS/TUBER ADAPTATION TRIAL, CHIPPROCESSING LINES MSG9 5. MSK47A MSJ69Y 9. MSJ6A MSL757 LBR PIKE 84. MSK MSJ MSK MSK498Y MSJ4564 LBR MSH MSK MSJ6A SNOWDEN ATLANTIC MSH56A MSJ454Y LBR ADAPTATION TRIAL, TABLESTOCK LINES DAKOTA ROSE 9. MSL NDTX44R 88. ONAWAY 88. MSJ6Y NDC58RED 88. A859R 88. CO8997RED MSK YUKON GOLD 8. CO976RED MSG NDTX475R MSE495Y MSI49A MSK6 LBR MSJ MSI5Y MSK STIRLING LBR

28 Table BLACKSPOT BRUISE SUSCEPTIBILITY TEST SIMULATED BRUISE SAMPLES* NUMBER OF SPOTS PER TUBER PERCENT (%) BRUISE AVERAGE ENTRY 4 5+ FREE SPOTS/TUBER PRELIMINARY TRIAL, CHIPPROCESSING LINES MSM7 88. MSM MSM MSK7B 4 8. PIKE MSI MSK85A MSM MSM44CY MSK9B MSM MSM MSM9Y MSM MSM MSM44Y LBR MSR MSM MSK6B MSM8A 4.8 ATLANTIC MSK7AY MSL7B SNOWDEN MSL64A MSM44Y

29 Table BLACKSPOT BRUISE SUSCEPTIBILITY TEST SIMULATED BRUISE SAMPLES* PERCENT (%) NUMBER OF SPOTS PER TUBER BRUISE AVERAGE ENTRY 4 5+ FREE SPOTS/TUBER PRELIMINARY TRIAL, CHIPPROCESSING LINES with LATE BLIGHT RESISTANT PEDIGREES MSL79AY MSK8A MSL77A MSM49Y PIKE MSM7D MSL58CY MSLB MSL45AY LBR MSK7C LBR MSK4A LBR 44.8 MSM47A LBR ATLANTIC SNOWDEN MSL76A MSM64Y PRELIMINARY TRIAL, TABLESTOCK LINES MSM86EY 5. MSL5ARUS 9. MSM88Y 9. MSLA 88. MSL75B 5 8. MSM MSM4B 5 8. A9795LB LBR MSL LBR MSL MSM7A LBR ONAWAY A LB LBR MSM4CY MSM8 LBR MSK9B MSM4 LBR MSM5A MSM MSL59AY LBR A9556 LBR? MSM485 LBR MSM8 LBR

30 Table BLACKSPOT BRUISE SUSCEPTIBILITY TEST SIMULATED BRUISE SAMPLES* PERCENT (%) NUMBER OF SPOTS PER TUBER BRUISE AVERAGE ENTRY 4 5+ FREE SPOTS/TUBER SNACK FOOD ASSOCIATION: BRUISE SAMPLES AF SNOWDEN 9. MSF99 9. NDTX495W 88. A ATLANTIC 5 8. MSH MSG ND58C ND W W 48.6 SNACK FOOD ASSOCIATION: CHECK SAMPLES A AF ATLANTIC 5. MSF99 5. MSG7 5. ND NDTX495W 5. SNOWDEN 5. W 5. W55 5. MSH ND58C