江西稻田蜘蛛区系及种群动态研究

赣中北平原稻区常见的稻田蜘蛛有9科25种,其数量占捕食性天敌的80％以上。早稻田以微蛛所占比例最大;晚稻田除微蛛外,狼蛛和球腹蛛也有较大的比例。稻田蜘蛛数量变动与稻叶蝉、稻飞虱的消长大体一致,对这类害虫有明显的抑制作用,但晚稻后期仍需药剂防治。

COHPOSITION AND DYNAMICS OF THE SPIDER FAUNA IN PADDIES OF JIANGXI PROVINCE

Investigations made during 1978-198O in Northern Jiangxi revealed 9 families and 25 species of spiders (Araneae) in rice fields. The spiders counted for 80% of the total predator community in the paddies. Results of systematic survey showed that Eriqonidium graminicolum and Oedothorax insecticeps were the dominant species in early-planting paddies, while the Micryphan-tids, Lycosa spp. and Pseudoannulats spp. were dominant in the late-plantings. The fluctuation of leafhopper and planthopper populations in rice fields were found to be closely related with that of the spider populations. It is concluded that the spiders are important agents suppressing the rice pests in the field.