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期 刊 ：植物保护学报 2010年

关键词：机敏漏斗蛛；灰飞虱；捕食作用；敏感性；杀虫剂；

Keywords:Agelena difficilis, Laodelphax striatellus, predation, sensibility, insecticides,

摘 要 ：为保护和利用灰飞虱的天敌资源,在室内条件下研究了机敏漏斗蛛Agelena difficilis (Fox)对不同龄期灰飞虱若虫和雌成虫的捕食作用,并利用滤纸法测定了机敏漏斗蛛对6种稻田常用杀虫剂的敏感性。结果表明:机敏漏斗蛛对灰飞虱若虫和成虫的捕食功能反应均符合Holling Ⅱ型方程;对灰飞虱1龄、3龄、5龄若虫及雌成虫的日最大捕食量分别达224.6、202.0、148.6、35.7头;对1龄若虫的瞬间捕食率为0.82,低于3、5龄若虫及雌成虫。机敏漏斗蛛密度的增加导致单头蜘蛛捕食量下降;相互干扰作用会降低机敏漏斗蛛对灰飞虱的捕食作用率。毒力测定结果表明,6种杀虫剂中,48%毒死蜱EC对机敏漏斗蛛毒性最高,24h LC₅₀值为0.30mg/L;依据杀虫剂的田间推荐使用剂量,25%吡蚜酮WP和10%吡虫啉WP的安全系数明显高于其它4种杀虫剂。

Abstract:For further protection and utilization of natural enemy resource, the predation of Agelena difficilis (Fox) on the nymphs and female adult of the small brown planthopper (SBPH), Laodelphax striatellus (Falln), was studied, and the sensibility of the spider to six insecticides which were commonly used in paddy field was determined with filter paper method as well. The results showed that the functional response of A.difficilis nymphs and adults could be described with Holling Ⅱ equation. Predation number of A.difficilis on 1st, 3rd, 5th instar nymphs and the female adults of SBPH were 224.6, 202.0, 148.6 and 35.7, respectively. The moment attack parameter of the spider to the 1st instar nymph was 0.82, which was lower than that of spider to the 3rd, 5th instar nymphs and female adults. Intra-specific interference of the spider was found in the experiment. The predation rate of A.difficilis decreased along with the increase of predator density. Mutual interference reduced the searching efficiency of the spider. The toxicity of 48% chlorpyrifos EC to A.difficilis was the strongest among the six insecticides tested in the experiment with the LC₅₀ value within 24h 0.30mg/L. According to the recommended concentration of the six insecticides, the safety factors of 25% pymetrozin WP and 10% imidacloprid WP were much higher than the other four insecticides.

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