黑胸樟叶蜂生物学特性及无公害防治OA

To effectively control Moricella nigrita,the annual life history and living habits of M.nigrita were observed through three years of laboratory rearing and field experiments,and pollution-free control experiments were carried out.The results showed that M.nigrita had three generations a year in Chongzhou area of Sichuan province,and the generations overlapped.The mature larvae entered the soil in mid-late June to oversummer and overwinter with prepupae,and began to emerge in mid-February of the next year.Eggs of the first,second,and third(overwintering)generations were first observed in early March,early April,and early May,respectively.The egg stage was 7-9 days,the larval stage was 9-18 days,the pupal stage was 1-4 days,and the overwintering prepupal stage was about 260 days.Adults preferred to emerge on sunny mornings after rain from soil,and can mate and lay eggs immediately after emergence without supplementary feeding habits.Adults showed a clear preference for yellow and green sticky boards.Larvae underwent four instars,the first to second instar larvae feeding a small amount of leaves,while the third to fourth instar larvae taking a significant increase in food intake,and mature larvae burrowing into the soil and spinning cocoons.The trapping effect of yellow sticky boards on adults was better than that of green ones.The control effects on the larvae of M.nigrita were more than 90.0%three days after foliar spraying with abamectin 1%microcapsule suspension(CS)3 500 times liquid,emamectin benzoate·chlorbenzuron 25%suspension concentrate(SC)3 000 times liquid,or azadirachtin 0.5%emulsifiable concentrate(EC)400 times liquid.Different doses of emamectin benzoate·imidacloprid 10%soluble liquid(SL)or emamectin benzoate 2%EC were used to control the first generation larvae by self-flowing trunk injection.After 20 days,the highest corrected population decline rate could reach 65.6%,corrected decrease rate of insect-infested plants of 84.6%-100.0%38 days after injection and 80.0%-90.0%73 days after injection.The yellow sticky boards and the green ones can be used for monitoring and control of the adults of M.nigrita,while foliar spraying or trunk injection can be selected for the control of the larvae based on infestation dynamics.