(1) Damage characteristics and living habits: Aphids like to live in groups on leaf backs, pedicels or tender stems, suck plant juices and secrete honeydew. The damaged leaves turn yellow and shrink and curl. The tender stems and pedicels are bent and deformed, which affects flowering and fruiting, inhibits plant growth and even withers and dies. Aphids can not only suck plant juice and cause dangerous kilns, but also spread a variety of virus diseases. Aphids can spread the virus in a short time as long as they are smoked in infected buildings and then moved to disease-free factories. The severity of this hazard is far greater than the aphid hazard itself. Aphids mainly overwinter on vegetables stored in open fields and pits, but do not overwinter in greenhouses and continue to breed. The following spring, winged aphids migrated to eggplant or other host crops to continue their reproduction.

(2) Control methods: ① Eliminate weeds in the field and its vicinity and reduce the source of aphids. ② Eggplants cultivated in greenhouse can be planted with gray plastic film or covered with silver-gray plastic film to avoid aphids. (3) Set an orange-wrapped aphid trap between the production line and the cultivation line. Use the strong tendency of aphids to turn yellow and discolor to trap and kill aphids. ④ Chemical control. Because aphids breed quickly, they must be controlled in time. When aphids harm eggplant, they are mostly on the back of leaves and tender leaves, so they should be considered carefully when spraying pesticides. It is best to choose a new pesticide with three functions: contact killing, internal inhalation and fumigation. For example, 50% pirimicarb WP is 2000 times, or 30% cypermethrin EC is 800 ~ 1000 times, or 70% chlorpyrifos WP 100D, forming 2 1% mirex EC with 3000 ~ 4000 times. In order to prevent aphids from developing drug resistance, various pesticides should be used alternately.