对江西高安等 16个县、市林区的马尾松毛虫用溴氰菊酯、氰戊菊酯和氯氰菊酯用点滴法进行毒力测定, 结果表明, 江西林区马尾松毛虫对溴氰菊酯的耐药力有明显提高, 其中高安、贵溪林区马尾松毛虫的抗性指数达到了低抗水平。马尾松毛虫对氰戊菊酯和氯氰菊酯尚未产生抗性。室内用以上 3种拟除虫菊酯与增效磷(SV1)按 1∶0.5、1∶1、1∶3、1∶5和 1∶10的比例混配, 用点滴法对马尾松毛虫进行毒力测定, 结果表明, 增效磷与拟除虫菊酯混配有明显的增效作用, 并且随着 SV1比例的提高, 增效作用增强。用 4种拟除虫菊酯杀虫剂(2.5%溴氰菊酯、20%氰戊菊酯、2.5%三氟氯氰菊酯和 10 %氯氰菊酯)加增效磷按不同混配比进行林间防治马尾松毛虫试验, 结果表明, 增效磷与拟除虫菊酯杀虫剂混配有极显著的增效作用。林间防治松毛虫以溴氰菊酯 +SV1(1∶5)、氰戊菊酯 +SV1(1∶3～1∶5)、三氟氯氰菊酯 +SV1(1∶3～1∶5)以及氯氰菊酯 +SV1(1∶5)稀释8000倍效果最佳。

44 p lotswere set up in different slash p ine p lantations in J iangxi Province. The relationship between themean population density of Hylobitelus x iaoi and the mean worm hole in slash p ine were investigated and 5 functionswere found respectively. The results showed that the best suitable mathematics model could be described as: Y =0. 082x2 + 0. 2 216x + 0. 063, and the table of relationship between the mean population density of H. xiaoi and themean worm hole in slash p ine were established, which p rovided a simp ly method for number investigation andforecast of H. x iao in slash p ine p lantations.