松褐天牛羽化历期和各虫态在被害树上的分布

Emergence period of Monochamus alternatus and its distribution regularity on infested pines

松褐天牛 Monochamusalternatus在浙东沿海地区的羽化始期为 5月上旬 ,盛期为5月中旬至 6月上旬 ,末期为 7月上旬 ;室内羽化的盛期和末期比露天网室滞后 2 0天。卵、幼虫和蛹在被害树体上的数量分布 ,树干中段 >下段 >梢段 >侧枝 ;分布密度 ,树干梢段 >中段 >下段。蛀入木质部幼虫的成虫羽化率室内室外均为 70

The initial,flourishing and final stages of Monochamus alternatus emergence are first 10 days of May, mid May to first 10 days of June and first 10 days of July respectively in the coastal area of Eastern Zhejiang Province The flourishing and final stages of emergence in lab are 20 days later than in the field.Quantity distributions of eggs,larvae and pupae on infested pines are middle part of trunk >lower part >upper part>offshoots while the density on trunks is upper part>middle part>lower part.The emergence rate of larvae bored into xylem is 70% both in the field and in lab.