For severe problems, spray with an approved chemical by label directions. Drought-stressed plants have less water in their plant tissues. The chemicals that enter the leaves will be more concentrated and may burn the leaves. Pest control is easier and safer while plants are outside for the summer than after you bring them in this fall. Azaleas need acid soil.
Alkalinity locks up iron needed for green color.
The larvae leave whitish trails as they move about. Leaf miners can especially damage hollies, boxwoods and locust trees. They attack most often in late summer, when the days are warm and nights are cool. High humidity also increases some mildews, particularly those on roses, apples and cherries. Prevention by proper cultural techniques is the first defense.