|Red Spider Mite courtesy of Wikimedia|
|Lemon tree affected by spider mites, courtesy of Wikimedia|
Miticide, either topical or systemic, is a good idea. But I live on an ecologically sensitive dune, and I don't have too many dahlias. So I simply washed them with water mixed with a smidge of laundry detergent. I made sure to get all the mites off the undersides of the leaves. Even cleaned the buds. Then I rinsed them off. Now fresh leaves are bursting forth, and no mites. The eggs I missed will hatch soon, so I'm going to wash them once a week, a few more times, just to be safe. And I doubled the watering and gave the plants a little shade. The sunflowers were only slightly affected; they got a bath, too, but they're looking fine. The dahlias are still pretty scraggly!