Pests and Diseases Eggplant is a delicacy for insects. It's a good idea to spray with an herbal insect spray when transplanting. Aphids, spider mites and caterpillars are the main culprits. Varied in color. Leaves turn yellow.
Plant alliums such as garlic and chives.
Anise, coriander, nasturtiums, and petunias may be helpful. Use yellow sticky traps or yellow dishes containing soapy water. Soap sprays and mint tea spray is highly effective. Lacewings will eat 100 aphids per day. They devour huge amounts of leaves and sometimes fruits.