Stink bugs are shield-shaped and most are brown or dull green. They attack the plants by sucking sap while simultaneously injecting a toxic substance that causes breakdown of plant tissue, distortion and occasional death of the plant. Symptoms include light-colored hard spots on tomatoes, sunken and seedless bean pods or peppers, hawkbilled sweet corn ears with rotten or hard kernels, gummy and catfaced peaches, deep depressions on pears and white or yellow blotches on leaves of cabbage family plants. In cold weather areas, they overwinter under debris and wood. In spring, they emerge to lay eggs on plant leaves. Eggs are barrel-shaped. In some species, adults migrate north in summer due to the extreme heat in the south. If destroying these insects by hand, try not to squish them with your bare hands because not only is the stench of the bug rancid, but the juices can cause rashes in some people.