Effective Trapping, Monitoring Critical Against Walnut Husk Fly - Western Farm Press
Tree Fruit Research and Extension Center - Washington State University
Walnut Husk Fly
A Serious Pest of both Walnuts and Peaches
The Walnut Husk Fly produces one generation per year and overwinters in the soil beneath trees. It is a mid to late season pest. In walnuts, females deposit eggs in the husk. After hatching, maggots feed inside the husk staining the nutshell. Later infestations result in shriveled, darkened kernels that are susceptible to mold and other environmental stresses which ultimately lower yield and quality.
In peaches, larvae feed internally on the fruit rendering it unmarketable.
YELLOW RECTANGLE TRAP
For effective intervention, it is necessary to monitor Walnut Husk Fly population levels. In general, constant monitoring is recommended. Contact local extension resources for specific regional recommendations regarding pest management strategies and control options.
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