Augmentation and conservation biological control of Tetranychus urticae on hops in Ohio

Susan Ndiaye & Celeste Welty
The twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is a key pest on hops grown in the Midwestern USA, where hop production is a new industry, and little research has been done on the management of T. urticae. In 2016 and 2017, we conducted an experiment to determine the efficacy of augmentative biological control of T. urticae populations on the cultivar ‘Cascade’ at four hop yards. In both years, treatments compared Neoseiulus fallacis Garman...
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