Decide if the problem needs action. Get involved to control the problem. Start with the simple approaches and use stronger ones only if needed. Aphids are showing up in large numbers this year. They come in green, red, brown, orange and black varieties.
Aphids concentrate on plants with soft tissues and on new shoots and leaves of many trees.
Some aphids will curl leaves over to make a protective home for themselves. One of the best aphid controls is a good hosing of the affected plants using a strong spray of water. The commercial soap preparations are highly effective as are the botanical synthetic insecticides available for aphid control. Caterpillars can do great damage to the garden but there is hope. B.T. or Bacillus thuringiensis , has proven very effective on feeding caterpillars.