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Label Group Numbers

Understand the importance of resistance management in pesticide use with this informative guide. Learn how to identify resistant weed species and implement strategies to delay resistance. Get recommendations on herbicide classes and their modes of action. Stay informed to maintain effective pest control.

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Label Group Numbers

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  1. Label Group Numbers Guides to Resistance Management

  2. Label Group Numbers How they made it to Labels Where they come from Understanding them Using them

  3. Purpose of the group numbers Resistance management guidelines for pesticides. Resistance: A pest once controlled by a pesticide and is no longer controlled by that pesticide. Michigan now has 24 resistant weed species!

  4. Group numbers are for several pesticides - this presentation is focused on herbicides

  5. On the Label - upper right corner

  6. A long journey to the label August, 2001 EPA issued guidance for voluntary pesticide resistance management labeling guidelines Align with other global resistance management systems - international harmonization

  7. Resistance Action Committees Industry technical committees: HRAC - Herbicide Resistance Action Committee Alliance with Weed Science Society of America HRAC system is alphabetic WSSA system is numeric - Canada started with numeric Both groups support a world-wide data base of herbicide resistance: http://www.weedscience.com

  8. The other Resistance Action Committees IRAC - Insecticide Resistance Action Committee FRAC -Fungicide Resistance Action Committee

  9. EPA’s Goal Ensure users are fully informed about resistance management while making clear that compliance is not required Direction For Use headings: “Resistance Management Recommendations” “box” the statements to clearly segregate the information from mandatory use instrictions

  10. Label herbicide resistance management statements - What can happen This is a Group _ herbicide. Any weed population may contain or develop plants naturally resistant this product and others in Group _ . Weed species with acquired resistance to group _ herbicides may eventually dominate the weed population if Group _ herbicides are used repeatedly in the same field or in successive years as the primary method of control for the target species. Total loss of control of the target species product or others in the Group is possible.

  11. Label herbicide resistance management statements - How to delay resistance Avoid consecutive use of the product and others in the Group.

  12. How to delay resistance Tank mix or use premixes of herbicides from different Groups

  13. How to delay resistance Base herbicide use on a comprehensive IPM program

  14. How to delay resistance Monitor application sites for weeds not dying

  15. How to delay resistance Contact your extension specialist, certified crop advisors and/or the manufacturer for integrated weed management recommendations for specific sites or resistant weed biotypes

  16. ACCase inhibitors Mode of Action - Lipid synthesis inhibitor Prevents the formation of fatty acids, which are essential for the production of lipids. Lipids are vital in the integrity of cell walls and thus new plant growth AI (Trade names) sethoxydim(Poast, Poast Plus) clethodim (Select Max) quizalifop(Assure II) fluazifop(Fusilade II & DX, component in Fusion), fenoxaprop (component in Fusion) A grass burndown herbicide - no resistant species in MI

  17. Amino Acid Synthesis Inhibitors ALS Inhibitors - metabolic pathway blockers imazapyr (Arsenal, Habitat, Sahara - w/diuron) imazapic (Plateau) halosulfuron (Manage, Sedge Hammer) sulfosulforon (Certainty) Resistant species: Palmer Amaranth Giant Foxtail Tall Water Hemp Kochia Common Ragweed Marestail/Horseweed

  18. Amino Acid Synthesis Inhibitors EPSP Synthase inhibitor - metabolic pathway blocker glyphosate (Roundup, Roundup QuickPro, Rodeo, Trailblazer) Resistant species: Palmer Amaranth Giant Foxtail Tall Water Hemp Kochia Common Ragweed Marestail/Horseweed

  19. Seedling Growth Inhibitors Inhibits a protein called tubulin which prevents mitosis pendimethalin (Pre-Em, Penncap) trifluralin (Treflan) pronamide (Barricade,Kerb) Noresistant species reported in Michigan

  20. Growth Regulators Synthetic auxins 2,4-D (Weedone, 2,4_D Amine &Ester + others) MCPA (Weedar + others) MCPP (MCPP4 Amine + others aminocyclopyrachlor (Perspective, Streamline) aminopyralid (Milestone) clopyralid (Confront, Lontrel, Transline) dicamba (Vision + others) quinclorac (Drive, QuinPro) fluroxypyr (Escalade) triclopyr (Garlon 3 &Garlon Ultra 4L,

  21. Growth Regulators Synthetic Auxins - these herbicides disrupt hormone balance and protein synthesis in plants, leading to a variety of plant growth abnormalities Resistant species Wild Carrot Lambsquarter

  22. Dicamba vs. Acorn Squash

  23. Photosynthesis Inhibitors These herbicides block the photosynthetic process, thereby preventing the conversion of sunlight into chemical energy - block photosynthetic electron transport atrazine (AAtrex - RUP) Resistant species - Velvetleaf, Powell Amaranth, simazine (Princep) Purslane, Groundsel, Prostrate Pigweed bentazon (Basagran) bromoxynil (Buctril, Moxy, others) diuron (Direx, Karmex) will be RUP in MI

  24. Cell Membrane Disrupters These herbicides disrupt cell membranes - “Burn Downs” Carfentrazone-ethyl (Quicksilver T&O, Square One w/quinclorac) Sulfentrazone (Speed Zone, Q-4. Dismiss, Oust) Flumioxazin (BroadStar, SureGuard) Lactofen (Cobra) diquat (Reward) paraquat (Gramoxone -RUP) Some reported resistance in aquatic - duckweed, Eurasian Watermilfoil

  25. Pigment Inhibitors -Bleachers HPPD inhibitors - Recent developments for resistant weeds mesotrione (Tenacity, Calisto) isoxaflutole (Balance) Right now limited Section 18 for Ag

  26. Mesotrione vs. Tomatoes

  27. Pigment Inhibitors PDS Inhibitor fluridone (Sonar) -Aquatic Herbicide

  28. Nitrogen Metabolism Inhibitor - bleaching Glutamine Assimilation Inhibitors - This herbicide blocks the enzyme glutamine synthetase, thus preventing the conversion of ammonia into amino acids Ammonia builds to toxic levels glufosinate (Finale, Liberty)

  29. Glufosinate vs. Flowers

  30. Label Group Numbers How they made it to Labels Where they come from Understanding them Using them

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