野生植物苦皮藤种油对黄守瓜成虫防治效果的初步研究

笔者为了寻找对黄守瓜 Aulacophora femoralis chinensis(Weise)成虫的拒食、内吸活性的物质,以野生植物苦皮藤(即苦皮树、落霜红、菜药皮)Celastros angulatusMoxim 种油为主,进行了初步试验,简报如下:一、试验材料(一)供试药剂:①苦皮藤根皮粉:将苦皮藤根皮放入烘箱60℃干燥,粉碎后,通过40目筛。②苦皮藤根皮粉石油醚提取物:取上述皮粉,放入索氏脂肪提取器中用石油醚

A PRELIMINARY STUDY ON THE CONTROL OF CELASTRUS ANGULATUS SEED OIL ON AULACOPHORA FEMORALIS CHINENSIS ADULTS

In 1983 and 1984,simultaneous simulations of the feeling amounts of cotton bollworm,Heliothis armigera (Hbn.) were carried out in cotton fields of Qiliying,Xinxiang County,Henan Province,to determine its damage to cotton in three aspects:the larval densities,the generation of bollworm,and the fertility levels of cotton fields.The conclusions were as follows: 1,There were enough time for the cotton to compensate its loss of squares caused by the second generation infestations.When the damage was within a definite level,no yield loss would occur,and the yield might even increase if the damage was slight.However,the compensation ability of cotton decreased conspicously as the plants grew,and the square loss became incurable in case a considerable damage of third generation might take place and thus caused a more serious yield reduction than the second generation did.