What are the biological pesticides and biological control methods suitable for litchi and longan orchards?

The biological pesticides commonly used in litchi and longan orchards are as follows: ① Microbial source and metabolite pesticides include Beauveria bassiana, Metarhizium anisopliae, Bacillus thuringiensis (Bt), avermectin and cycloserine. The first four pesticides are aimed at LEPIDOPTERA pests that harm litchi, longan twigs, young flowers and young fruits, such as leaf roller moth, inchworm and moth, while bicyclic serine can be used to control litchi and longan. ② Botanical pesticides mainly include azadirachtin, matrine and rotenone, which have contact killing, antifeedant and stomach toxicity, and are used to control various pests.

The main biological control methods are as follows: ① Using wasps to control litchi stinkbug. In early March every year, after the overwintering adult of litchi in stinkbug appeared, the time when stinkbug egg mass of litchi appeared in litchi orchard was observed. When 100 ~ 20 egg blocks are found in every hundred trees, the bees are released, and an egg card is hung every 2 ~ 3 trees when the bees are released (1000 eggs). (2) Using Trichogramma to control LEPIDOPTERA pests, such as leaf roller moth and inchworm. When litchi just sprouted, Trichogramma1000 ~ 2,000 heads/mu was artificially released for 3 times with an interval of 3 days. (3) the use of biological agents, such as spraying Bt agent to control litchi leaf roller and spraying azadirachtin EC to kill litchi stem borer adults.