Slide Presentation
TITLE
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Herbicide Drift Symptomology
AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
Herbicide Drift Symptomology
What is pesticide drift??
Common Causes of Drift (My Opinion)
Percentage of Time Wind Speed is <10 MPH During the Day
My Approach
Herbicide Injury or Something Else?
Herbicide Injury??
Herbicide Injury or Fertilizer Injury?
Roundup Drift?
Roundup Drift or LCB??
Herbicide Injury?
Herbicide Injury or Soil pH/Zn?
Herbicide Injury or Soil Fertility
Herbicide Injury or Soil Fertility
Drift or Potassium?
Herbicide Injury??
Herbicide Injury or Disease?
Most Common Drift Problems
Glyphosate
Glyphosate
Glyphosate
Peach - NCSU
Vegetable Sensitivity to Glyphosate
Tomato
Glyphosate
Liberty (glufosinate)
Liberty (glufosinate)
Liberty (glufosinate)
Liberty (glufosinate)
Liberty (glufosinate)
Paraquat
Paraquat
Paraquat
Blackberry
Pecan
Paraquat
Growth Regulators (2,4-D, dicamba, triclopyr, picloram, etc.)
dicamba
2,4-D
picloram
dicamba
dicamba
2,4-D
2,4-D
2,4-D
Oak Tree
Vegetables sensitivity to Phenoxys is high
Phenoxys
Phenoxys
Phenoxys
Aim (carfentrazone)
Strawberry
Valor (flumioxazin)
Valor
Staple (pyrithiobac)
Staple
Staple
Staple
Halex GT/Callisto (mesotrione)
mesotrione
Command (clomazone)
What is our role in a drift complaint?
Questions?
SLIDE CONTENTS
Herbicide Drift Symptomology Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Department of Crop & Soil Sciences
What is pesticide drift?? the movement of the pesticide away from the target area. physical drift vapor drift
Common Causes of Drift (My Opinion) Too windy Boom heights too high Tractor (Warp) speeds Nozzle selection
My Approach Obvious or not? Patterns Crop history Things you can easily prove or rule out pH Fertility nematodes
Herbicide Injury or Something Else?
Herbicide Injury??
Herbicide Injury or Fertilizer Injury? Phosphite Fertilizer
Roundup Drift?
Roundup Drift or LCB??
Herbicide Injury?
Herbicide Injury or Soil pH/Zn? July 2007 pH = 5.04 Zn = 14-17 lbs/a
Herbicide Injury or Soil Fertility
Herbicide Injury or Soil Fertility Old Pasture, no fertilizer was applied, medium soil test K (40 lbs/A) but K deficient (was 0.34% should be 1.7-3.0%) leaf sample
Drift or Potassium?
Herbicide Injury?? Johnson County August 2010
Herbicide Injury or Disease? Johnson County August 2010 Anthracnose
Most Common Drift Problems
Glyphosate
Peach - NCSU
Vegetable Sensitivity to Glyphosate
Tomato – NCSU/Ontario Ministry of Ag
Erick Larson - MSU
Liberty (glufosinate)
Paraquat
Blackberry - NCSU
Pecan – Lenny Wells (UGA)
Growth Regulators (2,4-D, dicamba, triclopyr, picloram, etc.)
dicamba
2,4-D
picloram
dicamba
dicamba
2,4-D (P. Dotray, Texas Tech)
Oak Tree - Bill Vencill - UGA
Vegetables sensitivity to Phenoxys is high
Aim (carfentrazone)
Strawberry – Univ. of California
Valor (flumioxazin)
Staple (pyrithiobac)
Halex GT/Callisto (mesotrione) Halex GT
mesotrione
Command (clomazone)
What is our role in a drift complaint? UGA Identification Effects/outcome Education GDA Samples Enforcement Litigation???
Questions? www.gaweed.com