Using All the Tools in the Pink Rot Management Tool Box. Jeff Miller
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1 Using All the Tools in the Pink Rot Mngement Tool Box Jeff Miller
2 Pink Rot Phytophthor erythroseptic
3 Pink rot Pythium lek Combintions of the two
4 Missing tools mke it hrd to get the job done.
5 Pink Rot Mngement 1. Field selection/crop rottion 2. Adjust soil ph by lime ppliction in low ph soils 3. Plnt less susceptible vrieties 4. Proper irrigtion mngement 5. Use pproprite fungicides 6. Avoid disese-fvorble conditions t hrvest 7. Apply post-hrvest fungicides 8. Reduce tuber pulp tempertures to 55 F or lower 9. Grde out infected tubers going into storge
6 IC IC 2. Adjust soil ph by lime pplictions in low ph soils b bc cd 0.80 b 0.80 d ph C (mg/l) From Benson et l., 2009, Am. J. Potto Res. 86: nd Benson et l., 2009, Am. J. Potto Res. 86:
7 3. Plnt less susceptible vrieties Gem Russet Bnnock Russet Atlntic Russet Burbnk Summit Defender Alturs Rnger Russet FL1533 Umtill Yukon Gold Id Rose Chipet Shepody Norkoth Ivory Crisp % Tubers with Pink Rot Test conducted 2002 in Rexburg, ID with nturl infection.
8 % PR Tubers cwt/cre 4. Proper Irrigtion Mngement 10 8 Effect of Irrigtion Frequency on PR Incidence b b Effect of Irrigtion Frequency on Yield b b X, 0.75" 2X, 1.12" 1X, 2.25" X, 0.75" 2X, 1.12" 1X, 2.25" Irrigting more frequently with less wter decreses pink rot pressure. Test conducted 2010 in Minidok, ID with nturl infection.
9 5. Use Approprite Fungicides Timing Two Anlogies Dose
10 Effect of Fungicide Progrms on Pink Rot, 2010 My 4 In-furrow July 5 Dime-size (DS) July 19 DS + 14 dys Aug 2 DS + 28 dys Aug 16 DS + 42 dys (Untreted check) Ridomil Gold bcd Ridomil Gold Cu, 2lb bc MetStr, 12.8 fl oz b Crop-phite, 10 pt d Crop-phite, 7.5 pt cd Mixed popultion (mefenoxm sensitive nd resistnt)
11 % Pink Rot Tubers Effect of Phosphite Rte nd Timing on Pink Rot Russet Norkoth, nturl infection, Minidok, ID, c Untreted Phostrol (10) Phostrol (5) Phostrol (5) 3 pplictions 6 pplictions 5 pplictions Dime-size tubers, Dime-size tubers, Dime-size tubers, +14 dys, + 14 dys Every 7 dys Every 14 dys bc b
12 % Pink Rot Tubers Effect of Fungicide Timing on Pink Rot UTC Phos Acid "Rescue" RG "Rescue" RG On time Norkoth On time = June 21, July 3 Rescue = July 30, August 6, August 13 All tretments significntly similr Burbnk On time = June 26, July 9 Rescue = July 30, August 6, August 13 12
13 % Pink Rot Tubers Effect of Irrigtion Frequency on Pink Rot X b 2X 1X 0 UTC MetStr Sme mount of wter pplied ech week. Difference ws frequency of irrigtion. Fungicides my not sve you from the effects of improper irrigtion.
14 % Pink Rot Tubers Pink Rot Fungicide Tril, b 2 1 cde cd 0 Check 1 Orondis Gold (10.8) Ridomil Gold Brvo (2.5) Rnmn IFAP Folir 2X IFAP
15 5. Use Approprite Fungicides Mefenoxm/metlxyl Cyzofmid Ridomil Gold products Rnmn Ultr Flourish MetStr Phosphorous cid Phostrol Resist 57 Phiticide Others Oxthipiprolin + Mefenoxm (in-furrow only) Orondis Gold
16 Incidencce 6. Avoid Disese Fvorble Conditions t Hrvest 60 F 70 F High Medium Low b High Medium Low 60 b Wound c Non-wound 20 0 Wound c b Non-wound Wounding increses likelihood of disese. Wrmer pulp tempertures increse likelihood of disese.
17 7. Apply Post-Hrvest Fungicides Phosphorous cid: 12.8 fl oz/ton tubers Apply in 0.5 gl wter/ton tubers
18 7. Apply Post-Hrvest Fungicides
19 Disinfect vs. Disinfest
20 Incidence 100 Effect of Post-Hrvest Applictions on Pink Rot 1-Ton Bin Tril b b c UTC HPPA 1:25 PA (3.2) PA (6.4) PA (12.8) Dilution rte Product rte in fl oz/ton
21 Incidence Effect of Post-inocultion Intervl on Incidence of Pink Rot Untreted HPPA PA Post-inocultion Intervl (Hours) 21
22 8. Reduce Tuber Pulp Tempertures in Storge Operte fns nd humidity s soon s the first duct is covered. Reduce tuber pulp tempertures to 55 F in stir step mnner, setting temps 2 cooler thn your coolest tubers. During the rmping period, ensure the temperture differentil between the top nd bottom of the pile is F. Nor Olsen, University of Idho
23 9. Grde Out Infected Tubers Prior to Storge
24 Pink Rot Mngement 1. Field selection/crop rottion 2. Adjust soil ph by lime ppliction in low ph soils 3. Plnt less susceptible vrieties 4. Proper irrigtion mngement 5. Use pproprite fungicides 6. Avoid disese-fvorble conditions t hrvest 7. Apply post-hrvest fungicides 8. Reduce tuber pulp tempertures to 55 F or lower 9. Grde out infected tubers going into storge
25 Cittions nd Additionl Informtion Johnson, D.A., Inglis, D.A., nd Miller, J.S Control of tuber rots cused by Oomycetes with folir pplictions of phosphorous cid. Plnt Disese 88: Lmbert, D.H. nd Sls, B Pink Rot. In WR Stevenson, R Lori, GD Frnc, nd DP Weingrtner (eds.), Compendium of Potto Diseses. Americn Phytopthologicl Society, St. Pul, MN. pp Merkens, C.L., Stck R.W., Gudmestd N.C., nd Secor G.A Occurrence of pink rot in both irrigted nd non-irrigted pottoes in Phytopthology (Abstr) 85: Miller, J.S., Miller T.D., Schneider A.T., nd Poteet R. 2004b. Influence of mefenoxm ppliction method on pink rot incidence s determined by lbortory ssys. Americn Journl of Potto Reserch (Abstr) 81: 74. Miller, J.S., Olsen, N., Woodell, L., Porter, L.D., nd Clyson, S Post-hrvest ppliction of zoxmide nd phosphite for control of potto tuber rots cused by oomycetes t hrvest. Americn Journl of Potto Reserch 83: Peters, R.D. nd Sturz, A.V A rpid technique for the evlution of potto germplsm for susceptibility to pink rot. Plnt Disese 85: Peters, R.D., Sturz, A.V., Pltt, H.W.B., nd Arsenult, W.J. 2004b. Recent investigtions regrding the soil-borne pthogen Phytophthor erythroseptic nd the mngement of potto pink rot. Recent Res.Devel.Crop Sci. 1: Sls, B., Secor, G.A., Tylor, R.J., nd Gudmestd, N.C Assessment of resistnce of tubers of potto cultivrs to Phytophthor erythroseptic nd Pythium ultimum. Plnt Disese 87: Sls, B., Stck, R.W., Secor, G.A., nd Gudmestd, N.C. 2000b. The effect of wounding, temperture, nd inoculum on the development of pink rot of pottoes cused by Phytophthor erythroseptic. Plnt Disese 84: Tylor, R.J., Sls, B., Secor, G.A., River, V., nd Gudmestd, N.C Sensitivity of North Americn isoltes of Phytophthor erythroseptic nd Pythium ultimum to mefenoxm (metlxyl). Plnt Disese 86: Tylor, R.J., Sls, B., nd Gudmestd, N.C Differences in etiology ffect mefenoxm efficcy nd the control of pink rot nd lek tuber diseses of potto. Plnt Disese 88:
26 Post-hrvest spry ppliction volumes Dry nd 0.25 gl/t Dry nd 0.50 gl/t Dry nd 1.0 gl/t Dry nd 2.0 gl/t 26
27 % tuber infected Effect of Wounding/Temperture on Pythium Lek Wounded Non-wounded
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