松梢象甲幼虫龄数及发育历期的研究

Study on Larval Instar Numbers and Development Duration of Pissodes nitidus

2005—2007年间，在黑龙江省朗乡林业局采用林间定期取样调查的方法，通过测量不同发育阶段幼虫的头宽，确定了松梢象甲幼虫的龄数；通过统计各龄幼虫数量和发育进度，用期距法确定了各龄幼虫发生盛期，并为当地松梢象甲的生产防治提出了最佳防治时间。

During 2005-2007,larval instar numbers of Pissodes nitidus was.studied by the method of regular sampling, from field and measurement of head width of different development stage larvae in Langxiang Forestry Bureau of Heilongjiang Province. Occurrence peak time was confirmed for each instar larva by the method of statistic of individual numbers of each instar larvae and development progress, and a best time for controlling the pest in local bureau was suggested.