Answer: Spider mites thrive in dry, dusty areas which is why they like the center branches of Arborvitae and other evergreens. Hosing the plants off every 3-4 weeks during the summer months is usually enough to discourage spider mites. However, if there is already a population you can control them with Safer 3-in-1 Garden Spray, or GardenSafe Garden Spray. Both are effective against spider mites and safe to use on Arborvitaes and other evergreen shrubs. Be sure to apply according to label directions.
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