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Advances understanding the relationship between flower-thrips and blueberries in Florida

Advances understanding the relationship between flower-thrips and blueberries in Florida . H. Alejandro Arevalo and Oscar Liburd University of Florida Gainesville 2006. Flower thrips & blueberries General information. Small insects ~1mm long Usually yellow-cream color

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Advances understanding the relationship between flower-thrips and blueberries in Florida

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  1. Advances understanding the relationship between flower-thrips and blueberries in Florida H. Alejandro Arevalo and Oscar Liburd University of Florida Gainesville 2006

  2. Flower thrips & blueberries General information • Small insects ~1mm long • Usually yellow-cream color • Feed and lay eggs in flowers • Petals • Ovaries • From egg to adult in 15 days • Present only during flowering period in blueberries

  3. Flower thrips & blueberries Sampling

  4. Flower thrips & blueberries Dispersion behavior Day 1 Day 3 Day 5 Day 7 Day 13 Day 15 Day 17 Day 21

  5. 1 10 70 90 20 Dispersion Size of thrips populations in relation to flower phenology Percentage of open flowers R=0.9908; F = 107.8; df = 3,9; P < 0.0001

  6. Flower thrips & blueberries E.I.L. Management EIL ET Number of insects Time

  7. Flower thrips & blueberries E.I.L.

  8. Flower thrips & blueberries E.I.L.

  9. Flower thrips & blueberries E.I.L. EIL = 3 thrips / flower at flower opening 30 thrips / 10 flowers Traps = 107 thrips in 16/63 of a trap 421 thrips/trap

  10. Flower thrips & blueberries Conclusions • White sticky traps and flower sampling are the best monitoring methods for flower thrips • Thrips are present in blueberry fields for about 25 days from flower opening to ‘petal fall’. • 7 days after bloom initiation the hot spots are defined. • Once the hot spots are defined the population growth is exponential for the next 10 days until ‘petal fall’ starts. • The ELI is about 3 thrips per flower at the start of the flowering period or 400 thrips per trap

  11. Acknowledgements • Florida Blueberry Association • Miller’s, Straughn’s, Paine’s, Southland, and Mixon Family Farm • S- EPA grant #: X8-96424405-0 • Southern Region SARE #: GS05-12 • Small Fruit and Vegetable Lab at UF

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