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IPM of Western Flower Thrips my discussion points

Control of Western Flower Thrips Through Integrated Pest Management in Tomato and Pepper P resented by: Dr. Charles Mellinger, Glades Crop Care, Inc. August 29, 2008. IPM of Western Flower Thrips my discussion points. 1. Vector of Tomato Spotted Wilt Virus (TSWV)

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IPM of Western Flower Thrips my discussion points

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  1. Control of Western Flower Thrips Through Integrated Pest Management in Tomato and PepperPresented by: Dr. Charles Mellinger, Glades Crop Care, Inc.August 29, 2008

  2. IPM of Western Flower Thripsmy discussion points 1. Vector of Tomato Spotted Wilt Virus (TSWV) 2. Current infestation areas of thrips & TSWV 3. IPM • Correct identification required for correct response • Economic thresholds with and without TSWV • Control measures • Resistance management • Preventative practices

  3. 2. Current Situation - Thrips & TSWV • TSWV reservoirs—inadequate knowledge • Positive TSWV Identification in: • Tampa area peppers & ornamentals • Homestead tomatoes • Emilia • Georgia Transplants • Summary – very little at this point compared to Southeastern U.S.

  4. TSWV Symptoms

  5. Emilia with TSWV Symptoms

  6. 2. Current Situation - Thrips in South Florida 1985 - 2005 • Historically only Florida flower thrips • Recently small pockets of Western flower thrips • Homestead & adjacent areas with Thrips palmi • Populations changing and moving • New large populations of WFT-east coast • Significant population of other important thrips • Summary – thrips are becoming very important in South Florida crops 2006 - Present

  7. Thrips palmi F. occidentalis F. fusca F. tritici F. bispinosa

  8. 3. IPM • Correct identification of thrips’ genus/species required for correct response • Economic thresholds are different • Chemical control choices are different • No pyrethroids • Rotation and resistance management are different

  9. Insecticide Treatment for WFT Larvae Control in Spring Tomatoes Dr. Tom Kuhar – VA Eastern Shore

  10. WFT Adults & Minute Pirate Bugs (MPB) Collected from Pepper Blooms Ft. Pierce, FL, Spring 2007

  11. 3. IPM-Preventive Practices • Monitoring • Pre-planting: weeds and surrounding fallow • During crop production • During crop and post crop destruct - Impact on adjacent crops and fields • Varietal resistance—few varieties in pepper to TSWV • Reflective mulch---reduced #’s and incidence • Adjacent grower notifications • Conservation of the Thrips predator—The Minute Pirate Bug—Orius insidiosus

  12. Minute Pirate Bug (MPB) Orius insidiosus Larva Adult

  13. Sunflowers in pepper for thrips control: more Orius, fewer thrips

  14. Orius density in field without sunflower Gray: <0.01-0.05Green: 0.05-0.1Blue: 0.1-0.5Red: >0.5 Orius per pepper flower

  15. Orius densityin field with sunflower Gray: 0.01-0.05Green: 0.05-0.1Blue: 0.1-0.5Red: >0.5 Orius per pepper flower

  16. Thrips density in field without sunflower Gray: <1-5Green: 5-15Blue: 15-30Red: >30 Thrips per flower

  17. Thrips density in field with sunflower Gray: <1-5Green: 5-15Blue: 15-30Red: >30 Thrips per flower

  18. Summary • WFT expanding in South Florida • WFT excellent vector of TSWV • Augment pepper crop with sunflower • Few WFT Pesticide controls • Must ID thrips population for correct response • Must scout for correct response

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