在我县,蜘蛛是水稻害虫最为重要的捕食性天敌,体型小、爬行快,盆拍调查不仅计数困难、进度慢,而且不易准确。笔者试尝以指数法进行盆拍调查,收到了较好的效果。 盆拍调查在每块田取25点,每点1穴,按单盆蜘蛛数量分为4级:0级为无蜘蛛,Ⅰ级为单盆1—10头;Ⅱ级为 In our county, spiders are the most important predatory natural enemies for rice pests. They are small in size and fast in crawling. Not only is the countdown difficult, but the progress is slow and not accurate. I try to index the basin investigation, received good results. The basin survey took 25 points in each field, each point of 1 hole, according to the number of single spider is divided into four levels: 0 for the spider-free, Ⅰ grade single basin 1-10; Ⅱ grade