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在田间调查天敌蜘蛛消长时,除了对成、若蛛进行调查外,还须调查各种蜘蛛卵囊的数量。因此识别蜘蛛卵囊的形状和生境对拟订协调防治措施是必要的。兹将采集和观察到的13种主要农田蜘蛛卵囊的情况简述如下。 1.草间小黑蛛Erigonidium graminicola (Sundevall)属微蛛科。卵囊产于稻、棉、旱谷植株中、下部叶片正面或反面,椭圆形、扁平块状,白色,长约6～8毫米。囊外有疏松的丝状复盖物。卵粒球形,初为乳白色,将孵化时呈淡黄色。卵粒间粘着不
In the field investigation of natural enemies spiders growth and decline, in addition to into, if the spider to investigate, but also to investigate the number of spider oocysts. Therefore, identifying the shape and habitat of spider oocysts is necessary for the development of coordinated control measures. The 13 major farmland spider oocysts collected and observed are summarized below. 1. Black grass spider Erigonidium graminicola (Sundevall) is a subfamily. Oocysts produced in rice, cotton, Wadi plants, the lower leaves front or negative, oval, flat block, white, about 6 to 8 mm. Outside the bag loose filamentous cover. Ovoid globose, initially milky white, will be light yellow when hatching. No adhesion between the eggs