Answer: The silvery leaf color is a prime symptom of spider mite feeding. These tiny pests also leave webbing on plants where the leaf meets the stem or where two stems meet. If you find the webbing, the plant has a population of spider mites. These pests like dry dusty places so periodically hosing off the plants will discourage them. As for treating the plant already infested, you can try to control the population with insecticidal soap applications or miticides but it might be better for your healthy plants if you pull the infested plant and remove it from the garden.
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