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Insect Management Tools

Insect Management Tools. Ric Bessin Extension Entomologists University of Kentucky Lexington. Insecticide Changes. Premixes Cobalt, Hero New Chemistry Belt, Oberon, Radiant New formuations Force CS, Regent TS (?). Pest Management Changes. Higher input costs/moderate prices

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Insect Management Tools

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  1. Insect Management Tools Ric Bessin Extension Entomologists University of Kentucky Lexington

  2. Insecticide Changes • Premixes • Cobalt, Hero • New Chemistry • Belt, Oberon, • Radiant • New formuations • Force CS, Regent TS (?)

  3. Pest Management Changes • Higher input costs/moderate prices • Seed costs as high as $350/unit • Dec 09 corn $3.72 • Effect of Economic thresholds? • Preventive Controls • Bt crops • Seed treatments • More stacked Bts

  4. Bt Types for Corn Pests

  5. Fall ArmywormWhorl Feeding, 1-9 ScaleLeonard, LSU AgCenter, 2007

  6. 500 450 400 350 300 250 200 150 100 50 0 VT Pro YieldGard Herculex Non Bt Southwestern Corn BorerTotal Tunnel Length per 20 Plants Musser, Mississippi State University, 2006

  7. SmartStax PerformanceFayette Co. 2008

  8. Future of Bt Corn • Resistance Management • Redundant Bt genes • SmartStax • New refuge strategies (??) • AcresMax • Reduced refuges • SmartStax, AcresMax • Broader-spectrum • More genes • YieldGard VT Pro

  9. What is the size your “B.t.” corn refuge? • 0 % • 1 to 19 % • 20 to 40 % • 41 to 60 % • More than 60 % Early Bird Meetings Turning Point Data 90 respondents 2008

  10. Are you worried about resistance to “B.t.” traits ? • Yes • No Early Bird Meetings Turning Point Data 101 respondents 2008

  11. HxXTRAMycogen 2T787, Urbana, IL, July 9, 2007: Mike Gray, Univ. of IL

  12. Resistance Management • High-dose refuge strategy • Goal 500 : 1 ratio of susceptible to resistant • KEY ASSUMPTIONS • Random mating • High dose event at correct time/tissue in plant • Frequency of resistance initially low • No more than 80% Bt corn • Refuge within ½ mile for CB Bt’s • Refuge immediately adjacent for RW and CB/RW Bt lines

  13. When is Bt Corn Needed (for KY)? • Bt CB – • Late planted corn • Corn planted after May 5 • Bt RW – • Corn following corn >2 yrs • Bt CB + RW – • When both of the above is true

  14. Bt-Corn Summary New Bt corn traits will probably: • Not effect on yield in most cases • Better ECB & SWCB resistance management • May have reduced refuge (SmartStax) • Improved control of CEW & FAW • Potential mycotoxin reduction • Reduce corn earworm populations if widely adopted – benefit soybean and corn

  15. Seed Treatments • On virtually all corn seed • Providing insect control to help with stand establishment • Other benefits • Seedling vigor?

  16. Environmental Issues with Seed Treatments • Effect on Coleomegillamaculata, a lady beetle • Effect on Honey bees

  17. Direction of Seed Treatments • Vigor enhancement • Nematode control • Resistance management – new classes of insecticides for seed treatments

  18. Heavy Pressure Consider RW seed treatments Consider soil-applied insecticides (in furrow), rootworm rates Light to Moderate Consider seed treatments (secondary pest rates) In-furrow soil-applied insecticides Wireworm Recommendations • Don’t plant early into high risk sites

  19. Are you worried about resistance to seed applied Insecticides? • Yes • No Early Bird Meetings Turning Point Data 65 respondents 2008

  20. Resistance Management • Resistance likely to play a larger role in pest management in coming years. • Many of the most commonly used pesticide belong to only two chemical groups, pyrethroids and neonicotinyls.

  21. Pyrethroids Ambush Asana Baythroid Capture Danitol Decis Mustang Max Pounce Proaxis Renounce Warrior Neonicotinoids Actara Admire Assail Calypso Clutch Cruiser Gaucho Platinum Poncho Prescribe Provado Venom Two most common groups

  22. Is Resistance Appearing? • Corn earworm (aka tomato fruitworm, soybean podworm, cotton bollworm) and pyrethroids? • Whiteflies – Bemisiatabaci Q biotype found in Kentucky.

  23. Insecticide Resistance: Rule 1 • Do not treat successive generations of a pest with chemicals of the same mode of action (use sequences of products) • Do not tank mix products with same MOA • Know the chemical class / Mode of action (IRAC codes!!) • Know the life cycle of the pest

  24. Soybean Pests • Soybean aphid • Dectes stem borer • Red-shouldered stink bug • Megacoptacribraria • Western bean cutworm • Variant corn rootworm

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