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Managing Difficult to Control Tarnished Plant Bugs Jeff Gore – USDA-ARS, Stoneville
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Overview Sources of Infestations Area-wide Management Variety Selection Spray Intervals and Rotations Insecticides and Coverage
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Tarnished Plant Bug Control: Mississippi No. Applications
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Tarnished Plant Bug Control Mid-South States – 102 Tests Orthene and Bidrin Maximum Percent Control Data adapted from Arthropod Management Tests 1994-2005
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Acephate Resistance Survey Mean LC50 Did not lose resistance during the winter
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Examples of early-spring broadleaf hosts of tarnished plant bug Buttercup Evening Primrose Butterweed Annual Fleabane Sourdock VetchCrimson CloverCutleaf Primrose
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Area-wide Plant Bug Management One herbicide application from late-Feb. through March.
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Area-Wide Plant Bug Control Delta Week in June No. per 100 sweeps Week in July
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Area-Wide Plant Bug Control Hills Sample Date No. per 100 sweeps
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Economic Benefit Dollars per Acre
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Plant Bugs in DP 444 vs 555 Nymph per 6 ft.
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Nectariless Cotton Bailey et al. 1980 Yield
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Foliar Plant Bug Control Percent Control
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Plant Bug Control With Experimentals Percent Control
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Insecticide Application Intervals Percent Nymphs/6 ft. Pre-treatment 4 DAT with Orthene (0.5 lb)
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Insecticide Rotations Nymphs/6 ft. Pre-treatment 4 DAT with Orthene (0.5 lb)
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Insecticide Rotations Nymphs/6 ft. Pre-treatment 4 DAT with Orthene (0.5 lb)
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Insecticide Rotations Number/6 ft. 5 days 9 days
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Tarnished Plant Bug Control Nymphs per 6 ft. 1 st Application 7-14-05
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Impact of Leaf Type on TPB Control 4 DAT1 with Orthene (0.5 lb) + Diamond (6 oz.) Nymphs/6 ft. Percent Control
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Impact of Nozzle Type on Insect Control Plant Bug Control, Orthene (0.5 lb) Percent Mortality (48 HAT) 40 psi, 5 mph, 9.4 GPA
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Impact of Nozzle Type on Insect Control Plant Bug Control, Centric (2 oz.) Percent Mortality (48 HAT) 40 psi, 5 mph, 9.4 GPA
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TPB Distribution in Cotton Node Below Terminal Frequency Bidrin = 14 TPB Nontreated = 32 TPB Bidrin = 12 TPB Nontreated = 5 TPB
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Temik Side Band Applications No. Nymphs per 6 row ft. 60-80% 10-31%
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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.
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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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