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通过 1999— 2 0 0 0年的系统调查 ,初步明确浙南地区菜田蜘蛛种类和发生趋势 ,发现其主要优势种为八斑球腹蛛和草间小黑蛛 ,分别占菜田蜘蛛总数的 4 0 .74 %和 30 .93%。栖住场所数量大小选择趋势为绿花菜≥花菜 >甘蓝 =大白菜 >小白菜。菜田蜘蛛一般在 12月底开始越冬 ,露地菜田 2月初少量开始活动 ,5月中旬至 10月初数量一直保持在较高的水平 ,11月形成一个明显发生高峰。菜田蜘蛛的时间生态位宽度和生态位重叠度较大 ,与菜田害虫在时间上具有同步性 ,表明菜田蜘蛛对菜田害虫具有较强的控制作用。试验还表明 ,抑太保、BT等 (生物防治区 )对蜘蛛杀伤力较小 ,乐斯本、锐劲特、氰戊菊酯等 (化学防治区和农民自控区 )对蜘蛛杀伤力较强。
According to the systematic investigation from 1999 to 2000, the species and trend of spiders in vegetable fields in southern Zhejiang were preliminarily determined. The main dominant species were C.pandinae and C.panthus, which accounted for the total number of spiders 4 0 .74% and 30 .93%. The choice of the number of habitat size trends: cauliflower> cauliflower> cabbage = Chinese cabbage> cabbage. Field spiders generally began overwintering at the end of December, with a small number of open-field vegetable fields beginning in early February. The number kept high from mid-May to early October, with a clear peak in November. The temporal niche width and niche overlap of vegetable spiders were greater than that of vegetable field pests, indicating that the vegetable spiders had a strong control effect on vegetable pests. The experiment also showed that the CPB, BT, etc. (biological control area) less lethal to the spider, Rex, BenQ, fenvalerate and other (chemical control and peasant control zone) strong lethal to the spider.