Anna D. Howell, Oleg Daugovish, Gina Ferrari, &

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Presentation transcript:

Can exclusion manage spotted wing drosophila (SWD) in organic blackberry production? Anna D. Howell, Oleg Daugovish, Gina Ferrari, & Heidi McMahan (UCCE – Ventura Co.) @bugAnnaDHowell @AnnaDaritaHowell

♂ ADH

♀ serrated ovipositor 1/8 – 1/16”

ADH

Activity decreases: ≥86 ᵒF Most active: 60-80 ᵒF Activity decreases: ≥86 ᵒF Generations per year: 10+ ADH

Management strategies Monitoring to detect early infestations Sanitation Clear out old fruit Sprays & baits to decrease populations Timing of sprays is key What about exclusion? ADH

Mini Mesh Hoop House Anti-insect mesh 50 (Green Tek) Excludes WF, leafminer, thrips, aphids, SWD adults 20-29% shade Double zipper doors 4 plots under mesh, 4 plots outside mesh (UTC) ADH

5 plants per plot ADH

ADH

Mini Mesh Hoop House Harvested marketable & marketable Unmarketable taken to the lab to look for SWD larvae Not all fruit was removed from mesh during 2016-2017 ADH

Average Temperature (F) in 24 hrs ADH

2016 Marketable Yield ADH

2016 Unmarketable Yield ADH

2016 %SWD ADH

2017 Marketable Yield ADH

2017 Unmarketable Yield ADH

2017 %SWD ADH

2018 Marketable Yield ADH

2018 Unmarketable Yield ADH

2018 %SWD ADH

UTC Mesh ADH

Summary Exclusion was not full proof Need to start clean Tunnels produced slightly higher yields early in the season & less unmarketable fruit Tunnels also protected berries from other environmental factors

UCCE Master Gardeners Ventura County Acknowledgements UCCE Master Gardeners Ventura County

Questions? @bugAnnaDHowell @AnnaDaritaHowell