Leaves are bronzed and/or have yellowish-white speckling.
Yellowish-white speckling and then bronzing of leaves is very characteristic of Two-spotted Spider Mite Injury.
Mite populations are highest when fertility is high, temperatures are warm, and humidity is low.
High levels of mites can reduce photosynthetic rates, reduce fruit production, as well as 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.
More information:
- Two-Spotted Spider Mite – (OMAFRA)
- Strawberry Spider Mites – (UC Davis)
Use these resources if you need additional help with diagnosis and to find solutions to your problem.