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Managing Difficult to Control Tarnished Plant Bugs

Managing Difficult to Control Tarnished Plant Bugs. Jeff Gore – USDA-ARS, Stoneville. Overview. Sources of Infestations Area-wide Management Variety Selection Spray Intervals and Rotations Insecticides and Coverage. Tarnished Plant Bug Control: Mississippi. No. Applications.

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Managing Difficult to Control Tarnished Plant Bugs

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  1. Managing Difficult to Control Tarnished Plant Bugs Jeff Gore – USDA-ARS, Stoneville

  2. Overview • Sources of Infestations • Area-wide Management • Variety Selection • Spray Intervals and Rotations • Insecticides and Coverage

  3. Tarnished Plant Bug Control: Mississippi No. Applications

  4. Tarnished Plant Bug ControlMid-South States – 102 TestsOrthene and Bidrin Maximum Percent Control Data adapted from Arthropod Management Tests 1994-2005

  5. Acephate Resistance Survey Did not lose resistance during the winter Mean LC50

  6. Examples of early-spring broadleaf hosts of tarnished plant bug Buttercup Annual Fleabane Evening Primrose Butterweed Sourdock Vetch Crimson Clover Cutleaf Primrose

  7. Area-wide Plant Bug Management One herbicide application from late-Feb. through March.

  8. Area-Wide Plant Bug ControlDelta No. per 100 sweeps Week in June Week in July

  9. Area-Wide Plant Bug ControlHills No. per 100 sweeps Sample Date

  10. Economic Benefit Dollars per Acre

  11. Plant Bugs in DP 444 vs 555 Nymph per 6 ft.

  12. Nectariless CottonBailey et al. 1980 Yield

  13. Foliar Plant Bug Control Percent Control

  14. Plant Bug Control With Experimentals Percent Control

  15. Insecticide Application Intervals 4 DAT with Orthene (0.5 lb) Percent Nymphs/6 ft. Pre-treatment

  16. Insecticide Rotations 4 DAT with Orthene (0.5 lb) Nymphs/6 ft. Nymphs/6 ft. Pre-treatment

  17. Insecticide Rotations 4 DAT with Orthene (0.5 lb) Nymphs/6 ft. Nymphs/6 ft. Pre-treatment

  18. Insecticide Rotations Number/6 ft. 9 days 5 days

  19. Tarnished Plant Bug Control Nymphs per 6 ft. 1st Application 7-14-05

  20. Impact of Leaf Type on TPB Control4 DAT1 with Orthene (0.5 lb) + Diamond (6 oz.) Nymphs/6 ft. Percent Control

  21. Impact of Nozzle Type on Insect ControlPlant Bug Control, Orthene (0.5 lb) Percent Mortality (48 HAT) 40 psi, 5 mph, 9.4 GPA

  22. Impact of Nozzle Type on Insect ControlPlant Bug Control, Centric (2 oz.) Percent Mortality (48 HAT) 40 psi, 5 mph, 9.4 GPA

  23. TPB Distribution in Cotton Bidrin = 14 TPB Nontreated = 32 TPB Bidrin = 12 TPB Nontreated = 5 TPB Frequency Node Below Terminal

  24. Temik Side Band Applications 10-31% No. Nymphs per 6 row ft. 60-80%

  25. Summary and Conclusions • Control with insecticides will become less consistent. • Spray intervals and rotations will be important. • Spray only when absolutely necessary and use accurate scouting methods and thresholds.

  26. Summary and Conclusions • No “silver bullets” in the near future. • Other factors that reduce plant bug numbers will need to be considered and integrated with foliar insecticides. • Variety selection: short season vs. long season nectaried vs. nectariless • Plant bug sources: wild hosts other crops

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