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

▶
managing foliar w heat diseases on a budget
SMART_READER_LITE
LIVE PREVIEW

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

Jun 25, 2023 289 likes •444 views

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

slide-1
SLIDE 1
  • Dr. Bob Hunger

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

Managing Foliar W heat Diseases on a Budget

Bob Hunger Extension W heat Pathologist Oklahom a State University

slide-2
SLIDE 2
  • Dr. Bob Hunger

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

W heat Foliar Diseases

Leaf rust ( Dr. J. Edw ards)

Pow dery m ildew Tan spot Septoria/ Stagonospora leaf & glum e blotch

Stripe rust ( Dr. P. Lipps)

slide-3
SLIDE 3
  • Dr. Bob Hunger

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

slide-4
SLIDE 4
  • Dr. Bob Hunger

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

slide-5
SLIDE 5
  • Dr. Bob Hunger

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

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 varieties + lines 45 70 25 52.7 56.0 3.3

Chickasha Standard vs. I ntensive W heat Managem ent Com parison

From : Oklahom a Sm all Grains Variety Perform ance Tests 2 0 1 4 -2 0 1 5 , J. Edw ards, et al.

slide-6
SLIDE 6
  • Dr. Bob Hunger

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

20 40 60 80 100 120 PM LR32DAA LR38 DAA

Disease Severity (%)

PM=powdery mildew LR=leaf rust

W heat Disease Control follow ing Fungicide Application – 2 0 1 5 – prim arily leaf rust

‐Fungicides applied on 10‐Apr (GS 10) ‐PM rated on 29‐Apr ‐LR read on 12‐May (32DAA) and 18‐May (38DAA)

slide-7
SLIDE 7
  • Dr. Bob Hunger

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

10 20 30 40 50 60 70 80 90 100 Yield TW

Yield and Test W eight I m pact follow ing W heat Foliar Fungicide Application - 2 0 1 5

Yield (bu/A) & TW (lb/bu)

  • Average yield

increase = 32%

  • Average TW

increase = 7%

slide-8
SLIDE 8

50 51 52 53 54 55 56 57 58 59 Yield TW

2 0 1 4 W heat Disease Control using Fungicides

Yield (bu/A) & test weight (lb/bu)

For Yield & TW – no differences between fungicides 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

slide-9
SLIDE 9
  • Dr. Bob Hunger

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

Return on Fungicide Use – North Carolina/Virginia

slide-10
SLIDE 10
  • Dr. Bob Hunger

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

Return on Fungicide Use – North Carolina/Virginia

slide-11
SLIDE 11
  • Dr. Bob Hunger

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

Return on Fungicide Use – North Carolina/Virginia

slide-12
SLIDE 12
  • Dr. Bob Hunger

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

Average Benefit on Fungicide Use – North Carolina

“Routine application

  • f any of the three

fungicide classes to wheat fields every year was a losing proposition.” “But the average long‐ term net returns from

  • nly applying

fungicides when disease was over threshold were excellent; ranging from $9 to $13 per acre. ”

slide-13
SLIDE 13
  • Dr. Bob Hunger

State Extension Wheat Pathologist 405‐744‐9958 Bob.hunger@okstate.edu Department of Entomology & Plant Pathology 127 Noble Research Ctr 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 Folicur – Bayer CropScience 4 3 0 Prosaro – Bayer CropScience 6 .5 -8 .2 3 0 STROBI LURI N ( FRAC Group 1 1 ) Headline – BASF 6 -9 1 0 .5 Evito – Arysta LifeScience 2 -4 4 0 Aproach - DuPont 6 -1 2 4 5 / 1 0 .5 TRI AZOLE + STROBI ( FRAC Groups 3 + 1 1 ) Quilt Xcel - Syngenta 1 0 .5 -1 4 1 0 .5 Stratego YLD – Bayer CropScience 4 3 5 Tw inLine – BASF 7 -9 3 0 / 1 0 .5 Aproach Prim a – DuPont 3 .4 -6 .8 4 5 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 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _

APHI = pre-harvest interval; num ber of days required betw een last application & harvest

Generics are available for Tilt and Folicur

This inform ation is provided only as a guide. I t is the responsibility

  • f the pesticide applicator by law

to read and follow all current label directions. No endorsem ent is intended for products listed, nor is criticism m eant for products not listed.

slide-14
SLIDE 14
  • Dr. Bob Hunger

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

slide-15
SLIDE 15
  • Dr. Bob Hunger

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