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Tuesday, January 27, 2009

我们也知道，蜘蛛除了用做药物外，尚能捕虫吃，而且专吃活虫，蜘蛛这种专门喜欢捕食新鲜肉食的习性，正是我们今天利用蜘蛛为天敌，消灭田间害虫的根据。它们捕食害虫的种类极多，象飞虱、叶蝉、蚜虫、叶螨、蝗蝻等重要害虫都是它 们所喜欢捕食的，而且它们食量也大。据观察，一种叫四颚蛛的每头每天可吸食叶蝉、飞虱共30头，一般一头蜘蛛每天也要吃3-5头害虫。尤其有利的是蜘蛛繁 殖速度很快，一般大田中蜘蛛的自然存在量每亩稻田中就可有几千到几万头之多，多的时候甚至可达到每亩十几万头。它们的繁殖能力也很强！！！！！！！！！！！！！！！！！


再见！！！！！！！！！

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