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思茅松毛虫是中国南部的重要松毛虫之一。以Pinus langbianensis Chu为食和以Keteleeria evelyniana为食的幼虫在形态上及发育上均有重大差异。 在安宁,幼虫主要取食Keteleeria evelyniana,每年发生1—2代。越冬后的幼虫在5—6月间化蛹而后在6—7月间发育成熟羽化。第一代幼虫在生长发育过程中产生分化:大部分幼虫生长缓慢而以幼虫越冬,其余的幼虫在四龄后生长迅速,于8月底化蛹、羽化,第二代幼虫于9月中、下旬孵化而以三龄幼虫越冬。引起分化的原因还不明了,应予深入研究。我们设想至少应追索到第一代幼虫孵化之前,因为在7月以前孵化的同一母虫的幼虫都可以产生分化。 这一害虫的化学防治试验了13种杀虫剂,每公斤“621烟剂加5％DDVP40毫升的试验在野外进行,死亡率高达90％。其他:50％phoxim 1:15000,90％Trichlorphon 1:15000,50％嘧啶硫磷1:3000,50％Cyanophos 1:5000,30％phosvel1:5000,40％伏地松1:5000,20％MTMC1:500,25％Carbaryl1:250,95％Cartap1:5000,50％Chorophenmidine1:1000,50％Garodona1:600及50％12401:3000倍均在室内进行试验,死亡率高达90％—100％。
Pine caterpillar is one of the major pine caterpillars in southern China. Larvae fed on Pinus langbianensis Chu and fed on Keteleeria evelyniana differ significantly in morphology and development. In peace, larvae feed on Keteleeria evelyniana, occurring 1-2 generations per year. After overwintering, the larvae pupate in May-June and then develop maturity in June-July. First-generation larvae differentiated during growth and development. Most larvae grew slowly and overwintered with larvae. The remaining larvae grew rapidly after the fourth instar and became pupae at the end of August. The second-generation larvae developed in mid-September and late September Hatching to third instar larvae overwintering. The cause of differentiation is not clear, should be in-depth study. We envisaged that at least the first generation larvae should be hatched before they hatch, because the larvae of the same larvae that hatch before July are able to differentiate. Thirteen insecticides were tested for chemical control of this pest, with a mortality rate of 90% per kilogram of “621 smoke plus 5% DDVP 40 ml.” Other: 50% phoxim 1: 15000, 90% Trichlorphon 1 : 50,000 50% Cyclophos 1: 5000, 50% Cyclophos 1: 5000, 30% Phosvel 1: 5000, 40% , 50% Chorophenmidine 1: 1000, 50% Garodona 1: 600 and 50% 12401: 3000 times were indoors and the mortality rate was as high as 90% -100%.