Western Flower Thrips Feeding Scars and Tospovirus Lesions ...
IPM of Western Flower Thrips my discussion points
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Transcript of IPM of Western Flower Thrips my discussion points
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Control of Western Flower Thrips Through
Integrated Pest Management in Tomato and Pepper
Presented by: Dr. Charles Mellinger, Glades Crop Care, Inc.
August 29, 2008
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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
IPM of Western Flower Thripsmy discussion points
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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.
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TSWV Symptoms
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Emilia with TSWV Symptoms
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2. Current Situation - Thrips in South Florida
• 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
1985 - 2005
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F. tritici
F. occidentalisF. fusca
F. bispinosa
Thrips palmi
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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
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Insecticide Treatment for WFT Larvae Control in Spring Tomatoes
Number of Thrips Larvae per 10 Leaves
05
1015202530354045
UTC Spintor 2SC6 fl oz/A
Baythroid2E 2.8 fl
oz/A
Radiant 6 fl oz/A
3 DAT7 DAT8 DAT
Dr. Tom Kuhar – VA Eastern Shore
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WFT Adults & Minute Pirate Bugs (MPB) Collected from Pepper Blooms
Ft. Pierce, FL, Spring 2007May Untreated
checkPyrethroid Intrepid
WFT MPB WFT MPB WFT MPB8 48 5 94 4 83 4
10 82 8 136 0 78 1014 54 12 148 2 30 1116 64 10 245 0 144 621 86 8 147 1 60 323 50 4 251 0 77 529 79 3 182 1 34 12
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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
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Minute Pirate Bug (MPB)Orius insidiosus
Larva Adult
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Sunflowers in pepper for thrips control: more Orius, fewer thrips
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Orius density in field without sunflower
Gray: <0.01-0.05 Green: 0.05-0.1 Blue: 0.1-0.5 Red: >0.5
Orius per pepper flower
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Orius density in field with sunflower
Gray: 0.01-0.05 Green: 0.05-0.1 Blue: 0.1-0.5 Red: >0.5
Orius per pepper flower
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Thrips density in field without sunflower
Gray: <1-5 Green: 5-15 Blue: 15-30 Red: >30 Thrips per flower
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Thrips density in field with sunflower
Gray: <1-5 Green: 5-15 Blue: 15-30 Red: >30 Thrips per flower
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Thrips and Orius density on pepper flowers
05
10152025303540
Dates
Thrip
s/pe
pper
flow
er
0
0.05
0.1
0.15
0.2
0.25
Oriu
s/p
eppe
r flo
wer
Thrips - SunflowerThrips - No SunflowerOrius - SunflowerOrius - No Sunflower
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Impact of insecticides on prey:predator ratios in peppers
0.0
100.0
200.0
300.0
400.0
500.0
600.0
700.0
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Average MPB per sample
Ave
rage
thrip
s pe
r sam
ple
Gamma-cyhalothrin Treatments
Permethrin Treatments
Untreated Check
Methoxyfenozide Treatment
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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