Effect of Willamette Mite (Acari: Tetranychidae) on Grape Productivity and Quality: A Reappraisal

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Abstract
Feeding damage by Willamette mite, Eotetranychus willamettei Ewing, reduced soluble solids per grape berry during the first year of infestation. After infestation for two years, total fruit weight per vine was reduced by 17.9% at 1,308 mite-days (one mite feeding for 1 d). Mean berry size was reduced by 8% at 1,308 mite-days. No statistically significant reductions in pruning weight, shoot growth, or trunk girth were observed. No changes in soluble solids per berry were detected during the second year of the study. Hypotheses are discussed to explain apparent contradictions with previous studies and implications for threshold recommendations.

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