Answer: Spider mites seem to thrive when conditions are dry and dusty and are a real problem in outdoor plants during the latter part of the summer. Indoors, the conditions might be just dry enough to promote a population surge. When you bring your trees indoors after their summer outing, be sure to give them a shower with tepid water to rinse away hitchhiking spider mites and their eggs.
To control the infestation, give your trees a shower in the bathtub, carefully rinsing all plant parts, especially the undersides of the leaves. Wait a few weeks and shower them again. Eventually you'll rinse the insects and their eggs down the drain. Then, throughout the winter months, periodically treat your trees to a shower to remove dust and discourage spider mite insects.
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