Slide Presentation

TITLE    (click title to view slides)
Herbicide Resistance: Protecting the PPO's

AUTHOR
Eric P. Prostko
Extension Weed Specialist
Dept. of Crop and Soil Sciences
The University of Georgia

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TABLE OF CONTENTS
  1. Herbicide Resistance: Protecting the PPO's
  2. Herbicide Resistance Definition
  3. Herbicide Resistance Why????
  4. PPO Inhibiting Herbicides
  5. Glyphosate and ALS resistance is forcing GA growers to rely on PPO herbicides!!!
  6. Palmer Amaranth Control in Peanuts Macon County, GA - 2007 (38 DAT)
  7. GR-Palmer Amaranth Control in Soybean - 2007 (83 DAT)
  8. What the heck is Prefix???
  9. High Potential to Overuse (Abuse) Reflex and Valor
  10. PPO Resistance Already Exists!
  11. Preventing PPO Resistance in GA
  12. Preventing PPO Resistance in GA
  13. Preventing PPO Resistance in GA
  14. UGA Weed Science



SLIDE CONTENTS
  1. Herbicide Resistance: Protecting the PPO's Eric P. Prostko Extension Weed Specialist Dept. of Crop & Soil Sciences The University of Georgia
  2. Herbicide Resistance Definition WSSA definition “the inherited ability of a plant to survive and reproduce following exposure to a dose of herbicide normally lethal to the wild type” ALS-Resistant Palmer Amaranth in Peanuts
  3. Herbicide Resistance Why???? Selection Pressure Overuse of single product or MOA Pollen Drift Resistant trait moves thru pollen Palmer Amaranth Pollen
  4. PPO Inhibiting Herbicides PPO or Protox Protoporphyrinogen oxidase Enzyme found in chloroplast and mitochondria needed for formation of chlorophyll Cell membrane destruction Many common herbicides have this mode of action!! Ultra Blazer, Cobra, Goal, Reflex, Ronstar, Resource, Aim, Valor, Storm, Spartan, ET
  5. Glyphosate and ALS resistance is forcing GA growers to rely on PPO herbicides!!! GR-Palmer Amaranth ALS-Palmer Amaranth
  6. Palmer Amaranth Control in Peanuts Macon County, GA – 2007 (38 DAT) NTC Valor SX 51WG @ 3 oz/A
  7. GR-Palmer Amaranth Control in Soybean – 2007 (83 DAT) Untreated Prefix 5.29EC @ 2 pt/A SB-01-07
  8. 5.29 SC formulation 4.34 lbs Dual Magnum 0.95 lb Reflex Use rate is 2 pt/A ($10.50) At 2 pts/A you get the following……. 1.085 lb ai of Dual Magnum (18.2 ozs/A) 0.2375 lb ai of Reflex (15.2 ozs/A) What the heck is Prefix???
  9. High Potential to Overuse (Abuse) Reflex and Valor
  10. PPO Resistance Already Exists! Common waterhemp 2001 (KS) Resistant to POST but not PRE 2002 (IL) 2005 (MO) Common ragweed 2005 (DE) Wild poinsettia 2004 (Brazil) *
  11. Preventing PPO Resistance in GA Know modes of action Should we save the PPO herbicides for our 2 most important row crops (cotton, peanuts)??? 1.7 million acres (cotton + peanuts) vs. 0.78 million acres (soybeans + corn) Rotate crops Corn (atrazine, Callisto, 2,4-D, Status) Soybeans (Dual Magnum, Sencor) Try not to use a PPO more than once per crop per year i.e. Do not use Valor and Reflex on cotton in the same year 2-1-2 program??? What about peanuts???? Valor, Cobra, Ultra Blazer, Storm
  12. Preventing PPO Resistance in GA Include other residual herbicides with PPO's Dual Magnum, Intrro, Outlook Treflan, Prowl, Sonalan Boundary (Sencor + Dual Magnum) Prefix (Reflex + Dual Magnum)
  13. Preventing PPO Resistance in GA Use other weed control tactics Cultivation No known cases of steel-resistance have been reported Diesel fuel prices and time are major deterrents Hand-rogueing (seed-bank control) Do not want to but may have to!!!
  14. www.gaweed.com