落叶松八齿小蠹综合防治的研究

STUDY ON THE IPC OF LARCH BARK BEETLE

落叶松八齿小蠹(Ips subelongatus Motsch.)在黑龙江省桦南县一年2代,部分个体一年3代。一年中出现三次以聚集信息素——化学信息为中心的扬飞侵入寄主高峰期。其成灾规律是在自然、气候及经营等多种削弱林木因素的综合作用下,从倒木向衰弱木扩散。进而侵害健康木的恶性循环过程。根据虫灾发生的特点划分了急性及慢性两种猖獗基地类型,并阐明形成机理及相应的监测、测报和综合防治技术。1984—1985年采取综合防治措施获得成功,有虫株率由1984年防治前的30％—65％下降到1％以下。提出了适于人工林落叶松八齿小蠹防治的IPC程序图。

Larch bark beetle (Ips subelongatus) produces two or three generations a year in Huanan county of Heilongjiang province.There are three flying and attacking host periods with emphases aggregation phenomena of the population in this area during the year. The outbreak law of this pest is a vicious circle process ,which it spreads to weakly trees from fallen trees, and then attacks the healthy trees because of integrate effects of all factors destroying the growth of tree, unsuitable natural condition,climatic factors and man activity.The outbreak forest sites were divided into two types,fast and slow types according to the pest occurence characters, meanwhile ,the mechanism of forming outbreak forest sites and relative techniques for forecast and IPC were presented.The IPC for 2000 ha outbreak Forest sites have been got successfully in Menjiagang forest farm from 1984 to 1986.The result of IPC shows that the injured rate of forests was reduced from 30%—65% to 1%.In the end ,a program diagram of IPC of larch bark beetle occured in larch plantation was presented.