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Gala apples harvested north of Wapato, Washington, in 2015. (TJ Mullinax/Good Fruit Grower file photo)

Gala apples harvested north of Wapato, Washington, in 2015. (TJ Mullinax/Good Fruit Grower file photo)

Since 2011, the Washington Tree Fruit Research Commission has conducted studies in apple and cherry crops to generate pesticide residue data for commonly used insecticides and fungicides. The studies aim to help Washington growers make more informed choices about their spray programs.

The WTFRC program recently completed its 2018 study on Gala apples, which included seven insecticides/acaricides, four fungicides and one plant growth regulator. The study also considered the effects of spraying concentrate (100 gallons of water/acre) versus dilute (200 gallons of water/acre) in a modern high-density orchard.

The results of that study, as well as previous reports from similar projects on apple and cherry crops, are now available on the WTFRC homepage: www.treefruitresearch.com

-by Jonelle Mejica