孟氏隐唇瓢虫捕食湿地松粉蚧的研究

本文采用生命表技术，研究孟氏隐唇瓢虫林间直接散放，取食湿地松粉蚧后的繁殖情况，结果表明：罩笼内孟氏隐唇瓢虫成虫出现２０天，其种群数量增加２７．２倍；在中心点散放成虫，６天后，在半径２０ｍ范围内均有幼虫发现，其最高密度为１２头／梢；２０天后，林间５３株松树均有该瓢虫幼虫分布，其最高密度已超过１００头／株。说明孟氏隐唇瓢虫取食湿地松粉蚧能充分满足其生长发育的基本条件。

STUDIES ON THE CRYPTOLAEMUS MONTROUZIRl MULSANT, FEEDING ON LOBLOLLY PINE MEALYBUG ORACELLA ACUTA(LOBDELL)

By means of the life table technique and the method of releasing the ladybird beetles in the pine forest, the cryptolaemus montrouzieri Mulsant, preying on Oracella acuta was studied. The re-sults showed that C. montrouzieri feeding on the mealybug was satisfied with its growth and devel-opment, the ladybird population in the cages increased 27.2 times after 20 days of the adults e-mergence, the ladybird larvae were surveyed surrounding a diameter of 20 meters from the center of the released sites in the forest after 6 days, where the highest density of C. montrouzieri larvae was 12 per shoot. After 20 day, the ladybird larvae on 53 trees were surveyed, on which the highest density was more than 100 per tree.