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异色瓢虫Leis axyridis(Pallas)是马尾松干蚧Matsucoccus massonianae Young et Hu的重要天敌之一。据室内测定,1头瓢虫成虫每天能捕食松干蚧卵1233.1粒,显露若虫3.8头、雌成虫3.5头、雄蛹9.8头,1头幼虫一生平均能捕食松干蚧卵14607.7粒、显露若虫148头、雌成虫58.2头、雄蛹123.3头,对松干蚧有一定的抑制作用。1980年4月我们在育王林区马尾松林中对马尾松干蚧危害较严重的15至20年生松树作了一次
Leis axyridis (Pallas) is one of the important natural enemies of Matsucoccus massonianae Young et Hu. According to the laboratory test, a ladybug adult could predate 1233.1 eggs of Songjian scale eggs per day, revealing 3.8 nymphs, 3.5 adult females and 9.8 male chrysalis. One larvae could predate on average 14607.7 eggs of Songjasmin eggs, revealing nymphs 148 and females Adult 58.2 head, male pupal 123.3 head, on the dry scales Kuwana have a certain inhibitory effect. In April, 1980, we made a one-time pest of Pinus massoniana in the Pinus massoniana forest in Yuwanglin District,