论文部分内容阅读
1986～1987年在河北省定州市进行了小麦田接种释放中华草蛉的试验。麦收时调查,33％的茧结在麦株顶部,67％的茧结在植株下部枯黄叶上和土缝中。在4月28日、5月10日和5月17日释放草蛉1龄幼虫,6月12日麦收时结茧率分別为27％、53.5％和36.3％,以5月10日释放的成活率最高。茧的羽化率则随释放期的延迟而减少,分别为100％、67％和23％。麦收时尚未羽化的茧,在麦秸处理和耕种措施中将遭到破坏。麦田草蛉羽化后转移到棉花、玉米等夏作上,因此在麦田中能安全羽化的草蛉数(成虫获得率),将影响夏作上草蛉的基数。综合考虑结茧率和羽化率,认为适期(约麦收前一个月)在麦田接种释放,结茧率(53.5％)和成虫获得率(35.8％)均较高,对小麦和夏作上草蛉的成活和增殖最为有利。在430亩小麦上接种释放草蛉,6月上旬放蛉区内玉米上的草蛉成虫密度较不放蛉区玉米上明显增加。在马铃薯、苜蓿和菜豆地释放草蛉,成活率均较小麦上为低。
1986 to 1987 in Dingzhou City, Hebei Province, a wheat field vaccination trial of Chinese shrews. When the wheat was collected, 33% of the cocoon knots were on the top of the wheat plants and 67% of the cocoon knots were on the yellow leaves and soil seams in the lower part of the plants. The 1st instar larvae of B. przewalskii were released on April 28, May 10 and May 17, and the cocoons yield was 27%, 53.5% and 36.3% respectively at the close of harvest on June 12 and was released on May 10 The highest rate. The emergence rate of cocoon decreased with the delay of release period, which was 100%, 67% and 23% respectively. The wheat-harvested cocoon, which has not emerged in fashion, will be destroyed in the straw processing and cultivation measures. After the emergence of wheatgrass, it will be transferred to summer crops such as cotton and corn. Therefore, the number of grass 能 which can be safely feathered in the wheat field (adult yield) will affect the base of grass 蛉 in summer. Considering cocooning rate and eclosion rate, it was considered that the cocooning rate (53.5%) and adult acquisition rate (35.8%) were higher during the period of inoculation (one month before wheat harvest)成 survival and proliferation of the most favorable. In 430 mu of wheat on the release of the release of grass mullet, in early June release maize mullet on the area of adult density is not significantly increased Ma Fang area corn significantly increased. In the potato, alfalfa and bean release of grass, the survival rate is lower than in wheat.