杨树毛蚜Chaitophorus spp.综合防治的研究

本文对杨树毛蚜的综合防治作了如下报道:1、异色瓢虫及其变种(变型)和七星瓢虫成熟时开始迁飞到邻近的毛白杨苗园、幼林内。由于瓢虫数量急剧增多、食蚜量大,致使两种毛蚜种群数量大幅度下降;夏、秋季节,在毛白杨上作为控制因子的瓢虫却寥寥无几,此时如遇干旱,气温偏高,毛蚜则日渐增多、猖獗成灾。7、8月份多雨。可控制毛蚜的大发生。2、化学防治可采用3％呋喃丹和15％铁灭克根埋施药。经试验两种药剂均为0.5克/株,在施药后第10天即有显著的防治效果,但后者较3％呋喃丹药效发挥快,效果更显著。

STUDIES ON THE INTEGRATED CONTROL OFChaitophorus Populiabae (Boyer de Fonscolombe ) AND C. populeli (Panzer)

This article reports; 1), Leis axyridis Pallas and Coccinella se-ptempunctata move to the nurseries and young plantations of Populus tome-ntosa Carr. during the season of wheat rippening.Because of the big appetite of the lady beetles and their rapid iacrease in number the population of Chaitophorus spp, decrease rapidly.In summer and autumn, there are very few lady beetles as controlling factors on the plants of Populus tomentosa Carr. and when the weither is rot and dry. Chaitophorus koch will swarm and becomes disastrous.plenty of rainfall in July and August can control the rapid growth of the population of Chaitophorus Koch.2), For chemical control, 3 % of Carbofuran and 15% of temilk buried around the roots of the plants would be effectual. Both the insecticides should be used in the dosage of 0.5g per plant. Obvious effect could be noticed on the tenth day after the insecticides are applied. The effect of the latter insecticide comes earlier and is more obvious than the former.