NORTH IDAHO ALFALFA VARIETY TRIALS DOUG FINKELNBURG UI EXTENSION
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1 NORTH IDAHO ALFALFA VARIETY TRIALS DOUG FINKELNBURG UI EXTENSION
2 IMPORTANCE TO IDAHO AGRICULTURE Statewide 1 million $735 million Northern Idaho ~50,000 acres Boundary, Bonner & Kootenai Co. ~18,000 acres, $2.9 $5.8 million annually
3 SUCCESSFUL ALFALFA Good Establishment Site preparation Soil test based fertility and acidity management program Certified, inoculated seed and a well adapted variety Sources of Alfalfa Info: Idaho Forage Handbook - Northern Idaho Fertilizer Guide Alfalfa -
4 EVALUATING ALFALFA VARIETIES Growing constraints Climate Temperature Precipitation Place Soil Management goals Long term hay Rotation crop Weed control Desirable traits Cold hardiness Disease resistance Herbicide resistance Sources of Alfalfa Info: National Alfalfa and Forage Alliance -
5 VARIETY CONSIDERATIONS Winter Survival (WS) Tendency to survive low temps (severe winter conditions) Ranked little damage 6-plant death Winter Survival Ratings* NAFA Category Check Variety Score Superior ZG Very Good Good WL325HQ 3 Moderate G Low Archer 5 Non Winter hardy Cuf 101 6
6 VARIETY CONSIDERATIONS Fall Dormancy (FD) Tendency to stop growing in fall 1 11 ranking, 1 very dormant, 11 non-dormant Higher FD = higher yield potential Fall Dormancy Ratings *NAFA Check Variety Rating Maverick 1 Vernal Legend 4 Archer 5 ABI700 6 Dona Ana 7 Pierce 8 CUF101 9 UC UC
7 VARIETY CONSIDERATIONS Diseases Anthracnose Diamond-shaped lesions on stems Hot moist conditions favorable Not observed in Idaho
8 VARIETY CONSIDERATIONS Diseases Aphanomyces Root Rot Stunts/kills seedlings, caused chronic root disease in established stands Common in wet soils Symptoms resemble nitrogen deficiency Plants slow to recover from cutting, dormancy Two races (race-1, race-2) Control with rotation, resistance
9 VARIETY CONSIDERATIONS Bacterial Wilt Most severe where nematodes/root feeding insects are a problem Plants are stunted, yellow/brown discoloration inside the root. Worsens with age of stand. Control with resistant varieties, cultural practices limiting crown/root damage
10 VARIETY CONSIDERATIONS Verticillium Wilt Occurs in cooler climates Spread by plant material on equipment Stunts plants; yellow V at leaf tips. Leaves may curl along midrib, turn pink. Stems remain green after leaves die. Resistant varieties; clean equipment, cut younger stands first. Bleach (10%) cutter bars
11 VARIETY CONSIDERATIONS Fusarium Wilt More common in warm climates, can be severe with nematode/root feeding insect issues Stunted plants, red/reddish brown discoloration inside roots. More sever with age of stand. Control with resistant varieties, root rot nematode resistance, reduced crown/root damage Photo by Dennis H. Hall.
12 VARIETY CONSIDERATIONS Pea Aphid Common ID-dark bands on antennae Turn leaves yellow, stunt plant growth Control with resistant varieties, early cutting, insecticides - University of Idaho -
13 VARIETY CONSIDERATIONS Spotted Alfalfa Aphid Likes warm, dry conditions late summer, older leaves Injects toxic substance, causes yellowing leaf veins, lower economic threshold than pea aphid Control with resistant varieties, early cutting, insecticides -
14 VARIETY CONSIDERATIONS Stem Nematodes Prefers heavy, wet soils Lives in plant matter mainly Transported in infested seed, plant residue, manure, irrigation water, equipment Symptoms: stunted patches, bare patches, areas of poor growth in spring, swollen distorted buds, gall-like outgrowths on crown Resistant varieties, sanitation, fall burning, crop rotation (2-4 yrs out, cereals good option except oats), cutting when soils are dry (top 2-3 inches)
15 VARIETY CONSIDERATIONS Northern Root Knot Nematode Wide host range rotation not practical mitigation method Causes galls and lateral root growth Varietal resistance is best option Photo by William Wergin and Richard Sayre. Colorized by Stephen Ausmus. U.S. Department of Agriculture - d Variety Trials
16 NORTH IDAHO ALFALFA VARIETY TRIALS Conducted by: UI-Personnel - Jim Church, Ken Hart, Doug Finkelnburg, and Glen Shewmaker Cooperators - Joe and Stephen Baerloecher (Idaho County) Mart and Marty Thompson (Lewis County)
17 NORTH IDAHO ALFALFA TRIALS 33 dryland alfalfa varieties planted 1 sanfoin mix seeded in plots
18 IDAHO COUNTY TRIAL Field Management: Seeding date = May 29, 2012 Seeded on a field following oats No fertilizer applied at seeding & 1 st yr 150 lbs of applied ea. yr Sprayed with Gramoxone each spring
19 LEWIS COUNTY TRIAL Field Management: Seeded May 30, 2012 Fall 2011 = 100 lbs Gypsum Fall 2012 = 4.2N 20P 20S 1.5Boron Fall 2013 = 100 Gyp-18S- 1 Boron Fall 2014 = 100 Gyp- 4.23N-20P-20K-18S-15chloride
20 ALFALFA TRIALS HARVEST DATES Idaho County June 14, 2013 June 20, 2014 June 18, 2015 June 16, 2016 Lewis County June 28, 2013 June 20, 2014 June 19, 2015 June 13, 2016
21 CLIMATE Panhandle ppt Camas Prairie ppt
22 TRIAL RESULTS Top yielding non-rr varieties Eight Site-Year Average Variety 1st Cutting Yield Protien lbs/acre tons/acre % Rugged Big Sky Ladak Magnum Melton AgRMS AgRMS TS Shaw PGI PGI LSD (0.05) CV (%)
23 TRIAL RESULTS Roundup Resistant Varieties Higher price Weed control tool Eight Site-Year Average Variety 1st Cutting Yield Protien lbs/acre tons/acre % WL 355RR MsSunstra AgRMS Hybri Force FGR47M Graze N Hay 3.1RR DKA DKA34-17RR R FGR48M LSD (0.05) CV (%)
24 SUMMARY Getting the most from alfalfa Know your climate, soil, fertility, disease pressures Manage for success Avoid compaction/damaging stand Clean equipment, don t spread a problem around Choose a well adapted variety that suits your operations management goals
25 CONTACT INFORMATION Doug Finkelnburg Nez Perce County Extension
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