Tetranychidae (spider mites) are very small sap-sucking pests living in colonies on leaf undersides. They cause light dots on the leaves, and eventually yellowing and drying.
The first symptom is usually the appearance of minute yellow stippling on the upper surface of leaves that have mites on the undersides. Infested leaves generally become yellow and may drop off from plants. Red spider mites on the back of a leaf (left) and mite damage on a cucurbit leaf (right).
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