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2021 Apple Pesticide Residue Study Report

Written by Tory Schmidt, Project Manager, Washington Tree Fruit Research Commission. November, 2021.

Since 2011, the WTFRC has conducted studies in apple and cherry to generate residue data for commonly used pesticides to help Washington growers make more informed choices about their spray programs.  The WTFRC Internal Program recently completed its 2021 study in apple which included 11 insecticides/acaricides, 8 fungicides, and 1 plant growth regulator in two distinct application scenarios in a modern high-density ‘Gala’ orchard.  Additionally, there is a new report available which summarizes pesticide residues detected across 11 years of WTFRC apple studies.  That summary report, the detailed report for the 2021 study, and previous reports from similar projects on apple and cherry are all now available on the WTFRC homepage:



Tory Schmidt
Project Manager
Washington Tree Fruit Research Commission
phone: 509-665-8271

Use pesticides with care. Apply them only to plants, animals, or sites listed on the labels. When mixing and applying pesticides, follow all label precautions to protect yourself and others around you. It is a violation of the law to disregard label directions. If pesticides are spilled on skin or clothing, remove clothing and wash skin thoroughly. Store pesticides in their original containers and keep them out of the reach of children, pets, and livestock.

YOU ARE REQUIRED BY LAW TO FOLLOW THE LABEL. It is a legal document. Always read the label before using any pesticide. You, the grower, are responsible for safe pesticide use. Trade (brand) names are provided for your reference only. No discrimination is intended, and other pesticides with the same active ingredient may be suitable. No endorsement is implied.

Washington State University