Managing Pink Rot. Pink Rot Management. Pink Rot Trials 2/15/2012. Fungicides for Pink Rot Management. Pink Rot Phytophthora erythroseptica
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- Wilfrid Hines
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1 2/15/212 Pink Rot Phytophthor erythroseptic Mnging Pink Rot Jeff Miller, Terry Miller, Trent Tysom, nd Scott Anderson Pink Rot Mngement 1. Field selection/crop rottion 2. Adjust soil ph y lime ppliction in low ph soils 3. Use less susceptile vrieties 4. Proper irrigtion mngement 5. Use pproprite fungicides 6. Avoid disese fvorle conditions t hrvest 7. Apply post hrvest fungicides 8. Reduce tuer pulp tempertures to 55 F or lower 9. Grde out infected tuers going into storge Fungicides for Pink Rot Mngement Mefenoxm/metlxyl products Ultr Flourish MetStr Phosphorous cid Rnmn (cyzofmid) Presidio (fluopicolide) Others? Serende, Gvel PA Fungicides with Reserch Results in Potto for Pink Rot Ctmrn Phostrol Confine Prophyt Phiticide (Crop phite) Rmprt Fosphite Resist 57 Topz Pink Rot Trils Premier Russet Plnted My 6: 36 rows, 14 seed, 19 cwt/cre Trils estlished in field with continuous potto Pink rot incidence determined t hrvest Bolded products hve post hrvest lel. Red the lel prior to use! Not ll products llow the use of rtes effective ginst pink rot. 5 1
2 2/15/212 Effect of Irrigtion on Pink Rot Proper Irrigtion Mngement Avoid excess wtering lte in the growing seson, especilly in wrm (>75 F) wether. How do we define excess? Numer of irrigtions? Amount of irrigtions? ers % PR Tue Effect of Irrigtion Frequency on PR Incidence X,.75" 2X, 1.12" 1X, 2.25" Test conducted 21 in Minidok, ID with nturl infection. Proper Irrigtion Mngement Effect of Irrigtion on Pink Rot 211 cre cwt/c Effect of Irrigtion Frequency on Yield 3X,.75" 2X, 1.12" 1X, 2.25" MetStr UTC 1X, X, X,.75 Test conducted 21 in Minidok, ID with nturl infection. Effect of Irrigtion on Yield 211 Irrigtion Tril Summry Less wter more often generlly resulted in less pink rot. 35 cwt/cr re X, X, X,.75 MetStr UTC MetStr performnce ws greter when pottoes were irrigted more frequently with reltively less wter. Impct of totl wter pplied not evluted. 2
3 2/15/212 Effect of Fungicide Progrms on Pink Rot, 28 Resistnt Popultion Effect of Fungicide Progrms on Pink Rot, 29 My 11 My 25 June 23 July 7 July 21 My 11 June 23 July 7 Rnmn + Silwet Rnmn Phostrol Phostrol Rnmn Phostrol Phostrol + Silwet Resist 57 Resist 57 Resist 57 c c MetStr MetStr c Brvo Brvo Brvo Brvo c In furrow Dime size DS Rnmn Phostrol Phostrol % Tuers Affected In furrow Hilling Dime size DS + 14 DS % Tuers Affected Effect of Fungicide Progrms on Pink Rot, 21 Effect of Fungicide Progrms on Yield, 21 My 4 My 27 July 5 July 19 Aug 2 Aug 16 My 4 My 27 July 5 July 19 Aug 2 Aug 16 (Untreted check) (Untreted check) 343 cd 384 Cu, 2l c Cu, 2l 382 MetStr, 12.8 fl oz MetStr, 12.8 fl oz 382 Crop-phite, 1 pt d Crop-phite, 1 pt 385 Crop-phite, 7.5 pt cd Crop-phite, 7.5 pt 386 Rnmn Rnmn Phostrol c Rnmn Rnmn Phostrol 392 Crop-phite c Crop-phite 46 In furrow Hilling Dime size DS + 14 DS + 28 DS In furrow Hilling Dime size DS + 14 DS + 28 DS Effect of Fungicide Progrms on Pink Rot, 211 Effect of Fungicide Progrms on Yield, 211 In furrow Dime size DS + 14 DS + 28 DS + 42 My 6 July 1 July 15 July 28 Aug 12 % Tuers Infected In furrow Dime size DS + 14 DS + 28 DS + 42 My 6 July 1 July 15 July 28 Aug 12 cwt/cre (Untreted check) (Untreted check) Brvo, 2.5 pt Brvo, 2.5 pt Brvo, 2.5 pt Brvo, 2.5 pt Resist 57, 1 pt Resist 57, 1 pt Resist 57, 1 pt Resist 57, 1 pt Resist 57, 8 pt Resist 57, 8 pt Disese ws highly vrile within the tril re. Disese ws highly vrile within the tril re. 3
4 2/15/212 Fungicides Leled for Pink Rot Control Phos Acid Products Tested in Idho In furrow t plnting products (mefenoxm) MetStr (metlxyl) Rnmn Presidio Hilling Rnmn Presidio Folir products (mefenoxm) MetStr (metlxyl) Phosphorous cid Resist 57 Phostrol Fosphite Phiticide (Crop phite) Effect of Rescue Tretment on Pink Rot Phytotoxicity Cn Occur UTC PA Rescue RG Rescue RG On time Reports from folir (eril) ppliction Lck of consistency Only oserved with erly morning pps Not oserved with chemigtion 5 Norkoth Burnk Inciden ce Effect of Post Hrvest Applictions on Pink Rot 1 Ton Bin Tril c UTC HPPA 1:25 PA (3.2) PA (6.4) PA (12.8) Sfe to Apply to Seed Hrvested tuers going into storge to e used for seed No chnge in seed performnce Avoid ppliction to short dormncy vrieties tht my sprout coming out of field Do not pply s seed tretment
5 2/15/212 Logistics of Post Hrvest Appliction Flow rte of tuers Supply of wter Approprite pressure Droplet size Numer of spry rs Nozzle type Plcement of spry Belts Pooling Trnsport of product Other demnds of hrvest Others? Self ppliction vs. hiring service compny Miller Reserch LLC 28 Post hrvest spry ppliction volumes Dry nd.25 gl/t Dry nd.5 gl/t Dry nd 1. gl/t 29 Dry nd 2. gl/t 3 5
6 2/15/212 1 Effect of Post inocultion Intervl on Incidence of Pink Rot ence Incide Untreted HPPA PA Post-inocultion Intervl (Hours) 32 Appliction through Humidifiction System Phosphorous Acid s Therml Aerosol Low lte light pressure UTC = 37% incidence Resist 57 = 8% (P<.1) Silver scurf nd dry rot study in storge Smll scle work to dte Cn it relly move through pile? Recent ddition to Resist 57 lel Esier mngement Timing my e wrong 33 1 C (212 F) 12 C oserved to oil little or no vpor ws evident 13 C to 15 C some wter vpor nd slt residue left in the ppliction plte 15 C to 19 C rpid voltiliztion of wter vpor leving ehind slt residue 25 C nd ove= true vporiztion occurred generting gs with strong grlic odor (phosphine gs). Also ignited! 34 No effects on processing qulity UTC Phos cid (1:5) Glucose (% fwt) Sucrose (% fwt) Men fry color* Russet Burnk fter 158 dys in storge fter tretment. *USDA fry color rting #1 44, #2 < 44 ut 35, #3 = < 35 ut 26 reflectnce How clen re your pottoes?
7 2/15/212 Acknowledgments Idho Potto Commission Actgro Aryst LifeSciences FMC FMC Syngent Crop Protection 7
H. Randall Smith; Ph.D. Agronomy and Wayne Porter: Ph.D. Horticulture Mississippi State University Extension Service
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