关键词: 茸喙丽金龟, 生活史, 发生规律, 苦参碱, 印楝素, 鱼藤酮, 毒力

Abstract: 【Aim】 The occurrence regularity of Adoretus puberulus and the peak period of daily activity of adults were investigated to provide a reference for the key period of the prevention and control of this pest, and the insecticides with good control efficacy were screened out to provide a reference for the control of A. puberulus using pesticides. 【Methods】 In pear orchard of Pu County, Shanxi Province, North China from April 25 to July 22, 2024, through the investigation of underground grubs, the pupation of overwintering mature larvae, the stinging of adults, and the time of oviposition and egg hatching were investigated. From June 12 to August 6, 2024, the daily number of eggs laid per female was investigated in the laboratory to study the law of oviposition. From May 6 to August 23, 2024, the occurrence law of adults was studied by trapping lamp, and the peak period of daily activity of adults was studied by trapping tent from July 10 to August 4, 2023. One percent matrine soluble concentrate (SL) was used for gradient dilution, and the final concentrations were 50, 100, 500, 1 000 and 5 000 mg/L matrine, respectively. Zero point three percent azadirachtin emulsifiable concentrate (EC) was used for gradient dilution, and the final concentrations were 5, 10, 20, 25 and 50 mg/L azadirachtin, respectively. And 6% rotenone microemulsion (ME) was used for gradient dilution, and the final concentrations were 5, 20, 50, 100 and 1 000 mg/L rotenone, respectively. The toxicity of these botanical insecticides to A. puberulus adults was determined by immersion method. 【Results】 In Pu County, Shanxi Province, the mature larvae of A. puberulus began to pupate in mid-May. Adults began to damage in early June, the adults emerged in mid-June began to lay eggs, and the peak period of adult oviposition was in early and middle July. At the end of June, the eggs began to hatch into larvae, and the egg duration was about 2 weeks. The peak period of adults was from mid-late June to early July. The number of adults trapped was the largest during 20: 00-22: 00, and the main activity time of adults was 20:00-24:00. The median lethal concentration (LC₅₀) values of three botanical insecticides matrine, azadirachtin and rotenone against A. puberulus adults were 515.6, 18.6 and 33.2 mg/L, respectively. 【Conclusion】 By clarifying the occurrence regularity and the peak period of evening activity of A. puberulus adults, it is recommended that light trapping and artificial capture of adults should be carried out during 20:00-24:00 every day from mid-late June to early July. Six percent rotenone in 500-fold dilution (120 mg/L rotenone) can be used for the management of A. puberulus in the pear orchard.

Key words: Adoretus puberulus, life cycle；occurrence regularity, matrine, azadirachtin, rotenone, toxicity