Control effect of eight botanical pesticides against Zanthoxylum bungeanum aphids in field.

[Objective] This study screened botanical pesticides with good control effect against Zanthoxylum bungeanum aphid and less damage to natural enemy insects to provide guidance for the development of green prevention and control technology in Hancheng. [Method] A total of 8 botanical pesticides including 0.3% Matrine AS (Huaheke), 5% Rotenone ME (Grammeda), 5% Pyrethrin EC (Fuxing), 0.4% Osthole SL (Jin minghui), 0. 3% Melialidin SL (Fuqiang), 0.5% Veratrine SL (Nongwei), 0.3% Matrine AS (Tiansibang) and 0.3% Matrine AS (Baojiakang) were diluted 500 times for field trails in 2020 and 2021 using water as blank control. In 2021, the natural enemy insects were investigated in fields with biological pesticides control and chemical pesticides control (3% Acetamiprid EC (Tianda), 2 000 times dilution and 5% Imidacloprid EC (Tianshen), 2 500 times dilution). [Result] The two-year field efficacy test showed that 5% Pyrethrin EC (Fuxing) had the best control effect of over 80% at 3 and 5 days after application and 100% after 7 and 14 days. The control effect of 0.3% Melialidin SL (Fuqiang) was above 70% at 5, 7 and 14 days after application. The treatment with 0.3% Matrine AS (Baojiakang) also showed excellent control effect 5, 7 and 14 days after application. The survey results showed that natural enemy insects were Coccinella septempunctata and Harmonia axyridis in gardens treated by both biological and chemical pesticides. The quantity and duration of insects in biological controlled garden were superior to those in chemical controlled garden. [Conclusion] It was recommended to use 5% Pyrethrin EC (Fuxing) 500 times solution for the prevention and control of Zanthoxylum bungeanum as the first choice for green control technology, while 0.3% Melialidin SL (Fuqiang) and 0.3% Matrine AS (Baojiakang) could be used as alternative pesticides for 5% Pyrethrin EC (Fuxing) to delay the emergence of resistance. [ABSTRACT FROM AUTHOR]