Apple Maggot is a Regulated Pest
The apple maggot was first detected in Washington in the early 1980s. Initially, its distribution was restricted to urban and native habitats in Clark and Spokane Counties. However, over time apple maggot has spread, primarily due to human activity moving infested fruit, and now 20 counties and parts of two other counties are listed as infested (see information here for specific information on counties impacted by the apple maggot quarantine). If an orchard is in a quarantined area that orchard is considered threatened by apple maggot and the orchard must be inspected (in orchard or packing house) by WSDA before the crop can be sold. If an orchard is not in a quarantine area but an apple maggot is detected within 0.5 miles, the orchard is considered “threatened” and monitoring or control actions should be instituted and the orchard will need to be inspected by WSDA.
Control of Apple Maggot
Apple maggot must be controlled in the adult stage prior to the deposition of eggs in fruit, therefore, contact insecticides are required for good crop protection. If an orchard is threatened by apple maggot insecticide applications are recommended starting 7 to 10 days after adults are predicted to emerge from the soil. A predictive model of adult apple maggot emergence is available on the WSU Decision Aid System. Apple maggot control in organic orchards can be very challenging as there are very few approved insecticides to this control of this pest.
Materials available for apple
Excerpt from the WSU Crop Protection Guide. For timings at which each pesticide can be used refer to the Crop Protection Guide.
The recommendations below are based on a combination of information from states in the eastern US where apple maggot is native and from western states where apple maggot is established. Some insecticides provide only suppression activity.
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.
Tree Fruit Research & Extension Center, Wenatchee, WA
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