Frequent watering will discourage mite build-up. A cornworm diet staple Cornworms often feed on eggplant beginning in July. These caterpillars are green, brown or black in color and are often found boring into the fruit. At first sign of damage or when caterpillars are first seen, begin spraying or dusting plants with Sevin and continue at weekly intervals until controlled. Remember to use Sevin for control of Colorado potato beetles on eggplant and make the first application as soon as the striped beetles are found.
Water eggplant frequently to reduce spider mite problems.
Do not use Kelthane for mite control. Three applications of malathion at 3-5 day intervals may be needed for mite control if severe infestations are found. Corn earworms may require weekly sprays of Sevin.