青海省六齿小蠹发生规律研究

Study on the Occurrence Regularity of Ips acuminatus in Qinghai Province

[目的]研究六齿小蠹的生物学特性。[方法]在坎布拉林场对油松六齿小蠹的发生规律进行研究。[结果]青海省六齿小蠹年生活史为1代,前后2代在夏季有部分重叠,成虫在9月下旬转至新的濒死油松树干蛀坑,在韧皮部下越冬。次年越冬代成虫4月中旬选择数势衰弱或濒死的油松,在树皮与边材间筑交配室繁殖,产卵期始于5月上旬,至8月中下旬结束,6—7月中旬为产卵高峰期,卵期6～12 d。幼虫发生于5月下旬至9月下旬,7—8月为幼虫活动高峰期,幼虫历期30 d左右。6月底有少量幼虫化蛹,蛹发生期从6月底至9月底,蛹历期6～10 d。新成虫于7月中旬羽化,最晚为10月初。[结论]该研究为有效防治六齿小蠹提供最佳时期。

[Objective]To study the biological characteristics of Ips acuminatus.[Method]The occurrence law of Pinus tabulaeformis Ips acuminatus was studied in cambra forest farm.[Result] The annual life history of Ips acuminatus in Qinghai Province was one generation,and the two generations overlapped in the summer. In late September,the adults transferred to the new bore-hole of the trunk of the dying Pinus tabulaeformis and overwintered under the phloem. In mid-april of the next winter,adults of the overwintering generation chose Pinus tabulaeformis with weak or dying numbers and built mating rooms between bark and sapwood to breed. The spawning period began in early may and ended in mid-late August. From June to mid-July,the spawning period was the peak,and the egg period was 6-12 days.Larvae occurred from late May to late September,and peak activity occurred from July to August. The larval period was about 30 days.At the end of June,there was a small number of larvae pupate. The pupa occured from the end of June to the end of September,and the pupa last for 6-10 days. The new adults appeared in mid-July,at the latest in early October.[Conclusion]This study provides the best time for the effective prevention and treatment of Ips acuminatus.