Method for preventing and controlling aphid with Menochilus sexmaculata

The invention discloses a method for preventing and controlling aphid with Menochilus sexmaculata comprising following steps: cultivating wheat seedlings, using the wheat seedlings as the host plants of corn leaf aphid for expanding propagation; inoculating second-stage larva of Menochilus sexmaculata to the wheat seedlings; the corn leaf aphid is used as breeding food for the Menochilus sexmaculata; a combination of wheat seedlings-corn leaf aphid- Menochilus sexmaculata is placed among rows of greenhouse crop seedlings, wherein the crops are not target crops of core leaf aphid; through the management of corn leaf aphid and Menochilus sexmaculata in the late stage, the Menochilus sexmaculata population is established in the crop system so as to continuously control aphid during the whole growing period of the crops. The advantages of the invention are: through introducing host plant-insects-natural enemy to a system in advance, before the occurrence of crop pests, there is enough natural enemy in the system,