Insect Pests

Aphids often cluster along stems like this. A certain identifying feature is a pair of tiny knob-like structures on the rear of their abdomen. - Clemson University USDA Cooperative Extension Slide Series, www.insectimages.org

Aphids multiply fast but if you control them early, plants do recover. - David W. Ragsdale, University of Minnesota, www.insectimages.org

Aphids are tiny (1/8-inch long), pear-shaped insects appearing by the hundreds on tender new growth and flower buds of all vegetables. There are many species that vary in color; they may be green, pink, yellow, brown, gray, or black. Some have wings, but most do not. They like the stems, buds, young fruit, tight places between leaves, and the undersides of leaves. They are worst in the mild weather of spring and fall, and they decline during hot weather.

Aphids pierce plants to suck out plant juices, causing wilting, stunted growth, and deformed leaves, stems, and fruit. If you control them early, plants do recover. Some species can also transmit viruses, especially in late crops, which can be more damaging than the aphids themselves.

Spray at the first sign of their presence because they multiply very rapidly. Don’t delay. Insecticidal soap, horticultural oil, or Neem oil sprays will kill the pests, or contact your regional Extension agent for other products approved in your state.

Fortunately, they are easy to kill if you spray properly. Natural enemies include ladybugs and lacewings.