Small larvae can be seen now feeding in ringed clusters around individual needles, leaving behind brown, twisted remains of needles. When the larvae become larger, they can strip branches bare. If there are only a few infested twigs, you can prune them out. In larger areas, you can use horticultural oils, Orthene, Dursban or Sevin. In rainy weather, a third application is sometimes recommended.
Professional application is good, because it can get higher into the trees.
Collards, chard, carrots, watermelon and cantaloupe, lettuce, sweet corn, beets. Early May is also the time to grow beans, cucumbers and tomatoes. If you don't like clover or dandelions in your lawn, fall is the best time to use chemicals on them. If you use such an herbicide, don't mow for several days before or after the application, and don't water for at least 24 hours after application. Do not use herbicides when the temperature is above 80 or when winds are higher than 5 mph.