The twenty-eight-spotted ladybug is also known as the physalis ladybug. The adult worms are all hemispherical, reddish-brown, densely covered with fine yellow-brown hairs, and there are 14 black spots on each elytra. The eggs are cannonball-shaped, initially light yellow, and later turn to yellowish brown. The mature larvae are light yellow, spindle-shaped, with a raised back, and neat branch spines on each section of the body and back. There are 4 spines on the 8th and 9th sections of the chest and abdomen, and 6 spines on the remaining sections. The pupa is light yellow, oval, with the tail end covered with the molted skin of the last instar larvae, and there are light black markings on the back.

Solanaceae ladybug damages eggplant, tomato, potato, leguminous family, cucurbitaceae, cruciferous family, Chenopodiaceae and other crops. Adults and larvae eat the mesophyll on the back of leaves, leaving only the epidermis, forming many irregular translucent fine grooves, like the bottom of a basket. The leaves can also be eaten into holes or only veins remain. In severe cases, the affected leaves will dry up and turn brown, and the whole plant will die. Eggplant fruits often break when chewed, and the tissue becomes stiff, rough, bitter, and unfit for consumption.

The twenty-eight-spotted ladybird beetle has three to five generations per year in the Yangtze River Basin, and overwinters as adults. Mainly scattered, with occasional clusters. The overwintering adults have a long egg-laying period, so the generations overlap. Adult worms exhibit suspended animation, have certain phototaxis, and are afraid of strong light. Eggs are mostly laid on the underside of leaves, and a small number are laid on stems and young shoots. The spreading ability of larvae is weak, and larvae hatched from the same egg mass generally cause damage to the current plant and surrounding connected plants. Larvae are more afraid of strong light than adults. Both adults and larvae have the habit of cannibalism and feeding on eggs. The larvae reach the 4th instar. Most mature larvae pupate in the lower part of the plant and on the back of the leaves. The second, third and fourth generations of this insect are the main harmful generations. This period coincides with the peak growth period of summer solanaceous vegetables in June, July and August. From the end of August to the beginning of September, solanaceous crops are harvested, plowed, larvae and pupae are successively harvested. The mortality rate is high. Young and adult insects move to wild hosts, beans and autumn cucumbers. Starting from early to mid-October, adults fly to overwintering places.

Prevention and control methods:

(1) Clean the remaining plants in the field in time to reduce the number of overwintering insect sources.

(2) Remove the egg masses on the back of the leaves during the peak period of egg-laying; take advantage of the adults' habit of suspended animation, beat the plants, and use pots to catch the fallen insects to concentrate and kill them.

(3) Chemical prevention and control. When the hatching rate of eggs in the field reaches 15 to 20, chemical control can be used. You can choose 80 dichlorvos EC or 90 crystal trichlorfon or 50 malathion EC 1000 times; 50 phoxim EC 1500 to 2000 times; 2.5 bromide Cypermethrin EC or 20 fenvalerate or 40 cypermethrin EC or 40 cypermethrin EC 3000 times liquid; 21 killing EC 6000 times liquid spray.