Common Eggplant pests

Flea beetles are the signature eggplant pest, chewing dozens of tiny round shot-holes in the leaves and hitting young transplants hardest. Colorado potato beetles (adults yellow with black stripes, plus humpbacked orange larvae and orange egg clusters on leaf undersides) can defoliate plants fast, while tomato and tobacco hornworms strip foliage and chew fruit. Aphids, whiteflies, and two-spotted spider mites gather on leaf undersides and cause curling, yellow stippling, and fine webbing, and the aphids and whiteflies can also spread viruses. The eggplant lace bug feeds on the undersides too, leaving pale stippled leaves and dark, varnish-like droppings.

Common diseases

Verticillium wilt is the most common serious disease, causing yellowing, wilting, and browning that often starts on one side or on the lower leaves, with brown streaking inside the stem. Phomopsis blight, which is specific to eggplant, produces leaf spots, stem cankers, and sunken tan rotted areas on the fruit. Early blight (Alternaria) appears as brown leaf spots with concentric rings and a yellow halo, and Cercospora leaf spot causes similar angular spotting. In warm, humid regions bacterial wilt can cause sudden collapse, and aphid-spread mosaic viruses mottle and distort the leaves.

Prevention

Rotate eggplant and its nightshade relatives (tomato, pepper, potato) so they do not return to the same bed for at least three or four years, since wilt fungi build up in the soil. Space plants for good airflow, water at the base in the morning to keep foliage dry, and choose Verticillium-tolerant varieties where soilborne wilt is a known problem. Remove and destroy diseased plants, clean up all crop debris at the end of the season, and avoid working among plants while they are wet to limit disease spread.

Organic control

Protect young transplants from flea beetles and other beetles with floating row covers from planting until flowering, then remove the covers so pollinators can reach the blooms. Hand-pick Colorado potato beetles, their egg masses, and hornworms in the morning and drop them into soapy water, and encourage beneficial insects such as lady beetles, lacewings, and parasitic wasps. For aphids, mites, and whiteflies, insecticidal soap or neem oil applied to leaf undersides works well, and Bt (Bacillus thuringiensis) targets hornworm caterpillars; use copper sprays only if a foliar disease is confirmed. Always read and follow the product label for any product you use, including its timing and safety directions.

Scouting & monitoring

Scout new transplants two or three times a week for flea beetle shot-holes and for Colorado potato beetle adults, orange egg masses, and larvae, since early action prevents heavy damage. Check leaf undersides regularly for aphids, whiteflies, mites, and lace bugs, and watch for the first yellowing or one-sided wilting that can signal Verticillium. As the fruit sizes up, inspect for the sunken tan lesions of Phomopsis and remove any affected fruit promptly.

Tips

Lead with prevention: rotate your nightshades, keep row covers on until bloom, and pull wilt-stricken plants rather than trying to save them. Scout leaf undersides weekly and act on small pest populations early with hand-picking and least-toxic sprays before they build up.

General home-garden IPM guidance, focused on prevention and least-toxic control. Always read and follow the product label for any pesticide, including organic products. Page updated Aug 4, 2026.