思茅松梢斑螟形态特征及生物学特性研究

Study on the biological characteristics of Dioryctria sp. in Pu'er city

思茅松梢斑螟为思茅松新记录害虫,是一种具有严重危害性的森林枝梢害虫。2007～2009年,在云南省普洱市通过对思茅松梢斑螟的地理分布、危害情况进行调查,并在室内对思茅松梢斑螟的形态特征、生物学特性进行观察。结果表明,思茅松梢斑螟在普洱市分布范围广,主要分布于海拔700～1 800 m;思茅松的被害株率为31.90%～98.82%,枝梢被害率为25.49%～32.33%。成虫寿命9.3天,每次产卵1～3粒,1年发生3代,世代重叠现象严重;2月上旬到11月中旬为幼虫主要危害期。

Dioryctria sp. , a new forest pests with high damage var. langbianensis by shoot, or causing dried up to death, and on forest shoot, the larvae is harmful to Pinus kesiya seriously hampering the growth and development of Pinus kesiya var. langbianensis. In this paper, an investigation on geographical distribution of Dioryctria sp. in Pu＇ er area of Yunnan Province was conducted during 2007 - 2009, the damage of Pinus kesiya var. langbianensis, biological characteristics, shoot water content were studied and analyzed. The results indicate that Dioryctria sp. is widely distributed in Pu＇ er area with ranging between 700 - 1 800 m, the damage rate of Pinus kesiya var. langbianensis is 31.90 % -98.82 % , damage rate of shoot is 25.49 % -32. 33 %. Dioryctria sp. has three generations each year in Pu＇er City and the main damage by larvae period normally occurs between February and November.