摘要
调查结果表明:稻纵卷叶螟的虫苞及幼虫田间分布型属聚集分布。其分布与水稻尽势等环境因素有关。当允许误差D=0.2时,不同幼虫虫口密度(?)下的抽样数量为n=3.7+26.9/(?)。在几种取样方法中以平行线法较好。
According to the obsevation on the distribution of worm-buds and larvae of the rice case worm, it is determined that their spatial distribution pattern is an aggregated one. Their aggregation is due to some environmental factors such as rice grouth features. When acceptable error D=0.2, the sampling numbers for larvae densities(?) with different means are n=3.7+(26.9)/(?). Several sampling methods are compared, and the results show that the parallel line sampling method is the best.
关键词
纵卷叶螟
田间分布
取样
水稻
Rice leaffolder
Spatial distribution pattern
Sampling method.
