Lacewings emit a foul odor to protect themselves from predators and humans. This odor is inherent in the lacewing's body and is extremely unpleasant and lasts for a long time. The larvae have this odor during their developmental stage, and as they grow, the odor becomes stronger and stronger. Lacewings, also known as lacewings, have larvae called aphids, which have a fluorescent green body with black markings. The head has one pair of antennae, which are elongated and filamentous. In addition to the two basal segments and the head of the same yellow-green, the rest of the parts are yellow-brown, compound eyes are larger, hemispherical, protruding from the sides of the head, golden yellow, and the head has 2-7 black spots.

Among the common lacewing species, the large lacewing and the Chinese lacewing are the most common, the large lacewing in addition to Inner Mongolia and Tibet, the Chinese lacewing in addition to Tibet, Taiwan, Guangxi did not see a news report, other provinces have the distribution of these two kinds of lacewing.

Lacewings can produce 4 generations a year, overwintering in cocoons as pupae. In mid to late April, there is a large amount of feathering, and adult lacewings occur from June to October. There are obvious overlapping phenomena occurring in all generations. The egg stage of each generation in summer and fall is about 3-12 days. The larval stage is 8-31 days, the pupal stage is 9-28 days, and the pre-egg laying stage is 11-18 days, so a generation lasts about 31-53 days.