Managing Foliar W heat Diseases on a Budget Bob Hunger Extension W - PowerPoint PPT Presentation

Managing Foliar W heat Diseases on a Budget Bob Hunger Extension W heat Pathologist Oklahom a State University Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

W heat Foliar Diseases Leaf rust ( Dr. J. Edw ards) Tan spot Pow dery m ildew Septoria/ Stagonospora leaf & glum e blotch Stripe rust ( Dr. P. Lipps) Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

Longevity of Control Follow ing W heat Foliar Fungicide Application - 2 0 1 5 Wheat trial @ Chickasha; 4 ‐ 24 ‐ 2015; Stripe rust; left 4.5 reps received fungicide Photo credit – Brian Arnall Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

Chickasha Standard vs. I ntensive W heat Managem ent Com parison Grain yield (bu/ac) Test weight (lb/bu) Standard Intensive Difference Standard Intensive Difference Pete 10 78 68 ‐‐‐‐ 59.7 ‐‐‐‐ Ruby Lee 25 64 39 44.7 53.9 9.2 Endurance 37 64 26 48.9 54.4 5.6 Doublestop CL + 41 60 19 53.7 52.0 ‐ 1.7 Billings 59 78 19 56.1 58.8 2.7 Gallagher 58 75 17 55.7 58.0 2.3 Deliver 52 64 12 53.9 55.0 1.1 Centerfield 47 59 11 51.7 55.0 3.3 Mean of all 50 45 70 25 52.7 56.0 3.3 varieties + lines From : Oklahom a Sm all Grains Variety Perform ance Tests 2 0 1 4 -2 0 1 5 , J. Edw ards, et al. Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

W heat Disease Control follow ing Fungicide Application – 2 0 1 5 – prim arily leaf rust ‐ Fungicides applied on 10 ‐ Apr (GS 10) 120 PM=powdery mildew LR=leaf rust ‐ PM rated on 29 ‐ Apr ‐ LR read on 12 ‐ May (32DAA) and 18 ‐ May (38DAA) 100 Disease Severity (%) 80 60 PM 40 LR32DAA 20 LR38 DAA 0 Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

Yield and Test W eight I m pact follow ing W heat Foliar Fungicide Application - 2 0 1 5 100 Yield (bu/A) & TW (lb/bu) 90 80 70 60 50 Yield 40 30 TW 20 10 0 Average yield • increase = 32% Average TW • increase = 7% Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

2 0 1 4 W heat Disease Control using Fungicides For Yield & TW – no differences between fungicides 59 58 Yield (bu/A) & test 57 weight (lb/bu) 56 55 54 53 Yield 52 TW 51 50 Fungicides ‐ Priaxor FB TwinLine applied on 19 ‐ Mar (GS 6) FB TwinLine on 25 ‐ Apr (GS 10.3) ‐ All other fungicides applied on 25 ‐ Apr (GS 10.3) ‐ No ratable disease observed in trial

Return on Fungicide Use – North Carolina/Virginia Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

Return on Fungicide Use – North Carolina/Virginia Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

Return on Fungicide Use – North Carolina/Virginia Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

Average Benefit on Fungicide Use – North Carolina “Routine application of any of the three fungicide classes to wheat fields every year was a losing proposition.” “But the average long ‐ term net returns from only applying fungicides when disease was over threshold were excellent; ranging from $9 to $13 per acre. ” Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

W heat Foliar Fungicides in Oklahom a ( Not a com plete listing) Rate PHI A Product ( oz/ A) ( days/ GS) TRI AZOLE ( FRAC Group 3 ) Tilt – Syngenta 4 1 0 .5 Generics are Folicur – Bayer CropScience 4 3 0 Prosaro – Bayer CropScience 6 .5 -8 .2 3 0 available for STROBI LURI N ( FRAC Group 1 1 ) Tilt and Folicur Headline – BASF 6 -9 1 0 .5 Evito – Arysta LifeScience 2 -4 4 0 Aproach - DuPont 6 -1 2 4 5 / 1 0 .5 This inform ation is provided only as a guide. I t is the responsibility TRI AZOLE + STROBI ( FRAC Groups 3 + 1 1 ) of the pesticide applicator by law to read and follow all current Quilt Xcel - Syngenta 1 0 .5 -1 4 1 0 .5 label directions. No endorsem ent Stratego YLD – Bayer CropScience 4 3 5 is intended for products listed, Tw inLine – BASF 7 -9 3 0 / 1 0 .5 nor is criticism m eant for Aproach Prim a – DuPont 3 .4 -6 .8 4 5 products not listed. Fortix – Arysta LS/ Chem inova 4 -6 4 0 SDH I NHI BI TOR ( FRAC Group 7 ) Vertisan – DuPont 1 0 -2 4 0 ( forage/ hay) / 1 0 .5 .1 SDH I NHI BI TOR + STROBI ( FRAC Groups 7 + 1 1 ) Priaxor – BASF 4 -8 1 0 .5 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ A PHI = pre-harvest interval; num ber of days required betw een last application & harvest Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

Economics of Wheat Foliar Fungicide Use Current Report CR 7668 10% X 30 bu/A X $4.00/bu ‐ $8.00/A = +$4.00/A 10% X 40 bu/A X $4.00/bu ‐ $8.00/A = +$8.00/A 10% X 40 bu/A X $4.00/bu ‐ $16.00/A = $0.00/A 10% X 60 bu/A X $4.00/bu ‐ $16.00/A = +$8.00/A Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University

Fungicide Observations/ Conclusions Foliar fungicides w ill protect yield that is present at • the tim e of application – better to spray a little early than a little late Apply w ith ground rig or aerial – key is to apply in a • tim ely fashion Not only protects yield, but also results in higher test • w eight/ quality Consider early application ( GS 6 -7 ) if have lots of • w heat residue and see tan spot, pow dery m ildew , and/ or Septoria early, or see num erous stripe rust hot spots Know the reaction of your planted varieties to foliar • diseases, scout your fields, and m onitor w hat is happening to the south Dr. Bob Hunger Department of Entomology & State Extension Wheat Pathologist Plant Pathology 405 ‐ 744 ‐ 9958 127 Noble Research Ctr Bob.hunger@okstate.edu Oklahoma State University