黄刺蛾寄主多,是榆、杨、柳树的主要食叶害虫之一;在通榆县形成大面积猖獗,虫口密度多达200多条/株。去年我们根据黄刺蛾的特性,应用赤眼蜂进行防治试验,获得初步效果。简介如下。放蜂面积约12公顷(为6公顷、3公顷、3公顷三片),均为2～3年生杨树幼林,高约2公尺左右,株距1公尺,行距1.5公尺。黄刺蛾卵较小,扁平,椭圆形水泡状(长径约1.5毫米,短径约0.95毫米),多单产于树冠下部1/3的叶背。七月上旬为产卵初期,至7月18日调查,孵化率已达25%左右。放蜂试验于7月18日进行。放蜂量为34万头/公顷,点放蜂量约为4千头。放蜂半径约 Trichosanthes host more, is elm, poplar and willow one of the main leaf-eating pests; formed in Tongyu County, rampant area, population density of up to more than 200 / strain. Last year, according to the characteristics of Trichoplusia, Trichogramma was used in prevention and control tests to obtain preliminary results. Brief introduction is as follows. About 12 hectares of bee-eaters (6 hectares, 3 hectares and 3 hectares) are two to three year-old poplar young trees about 2 meters high with a plant spacing of 1 meter and a row spacing of 1.5 meters. Echinops ovum smaller, flat, oval-shaped blisters (long diameter of about 1.5 mm, short diameter of about 0.95 mm), more than the middle of the crown yield 1/3 leaf back. Early July spawning early to July 18 survey, the hatching rate has reached 25%. Put the bee test on July 18. The number of bee-eaters was 340,000 heads per hectare, and the number of bee-drops was about 4,000 heads. Put bee radius about