Bronzing of leaves is very characteristic of twospotted spider mite injury. Mite populations are highest when fertility is high, temperatures are warm, and humidity is low. High levels can reduce photosynthetic rates and reduce fruit production and runnering. Threshold is 5 mites per leaf OR 15 out of 60 sampled leaves containing mites.

Spider mites are very small and most people require a hand lens to see them. They live on the undersides of leaves and produce webbing when populations are high.

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This is a part of The Berry Diagnostic Tool - a companion to the NRAES Production Guides for Strawberries, Raspberries and Blueberries