【摘要】 通过对受松墨天牛不同危害程度的马尾松林分施放不同数量的花绒寄甲成虫,研究该天敌昆虫对松墨天牛的防治效果。试验结果表明:在轻度、中度和重度马尾松受害林分中,以侵入孔数量与花绒寄甲成虫数量的比例分别为1∶10、1∶4和1∶2时,防治效果最佳,分别达70.54%、80.52%和82.18%。在实践生产中按松林受害程度,确定花绒寄甲成虫施放量在生产中较好操作。轻度、中度、重度受害松林,每公顷分别施放1 500头、4 000头、5 000头左右的花绒寄甲成虫为宜。更多还原

【Abstract】 T he biological control effect against M.alternatuse was studied by spraying different number of its natural enemy insect D.helophoroides adults into different victim pine stand.The results showed that the control effect was best when the number of invasion holes/the number of adults was 1/10,1/4 and 1/2 for mild,moderate and severely damaged pine forests,respectively,and the control rate was 70.54%,80.52% and 82.18%,respectively.The experimental results also showed that the application rate of D.helophoroides adults in practical production was better.For mild,moderate and severely damaged pine forests,it is advisable to place about 1,500 adults,4,000 adults and 5,000 adults,respectively,for each hectare.更多还原