Administrative Report Or Publication
 

Control of thrips on apples in the Hood River Valley of Oregon

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  • Field tests for 11 years have indicated damage to apples by Western flower thrips can be reduced as much as 90 percent by a well-timed application of an effective insecticide. Formetanate, (Carzo!) applied at or near full bloom, was the most effective insecticide tested in preventing pansy spotting on Newtown, and pitting and marking on Golden Delicious fruit. Pre- and post­bloom applications were ineffective in preventing apple injury regardless of the Insecticide used. A full-bloom application of formetanate was safe to honeybee pollinators if the spray was al lowed to dry at least three hours before bees began to forage. Trapping thrips in orchards to determine if preventive sprays were necessary proved unreliable.
  • Published May 1978. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
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