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本文报道了冬小麦生态系统中小麦、粘虫和粘虫的一种主要天敌——中华星步(虫甲)(Colosomachinense)三个亚系统的模型。同时把三个模型耦联起来进行逐日动态模拟确定了小麦不同生育期和中华星步(虫甲)不同密度下的经济阈值。模拟结果表明:粘虫发生越早,经济阈值越小;在小麦同一个生育期,经济阈值随中华星步(虫甲)密度的增加而提高,但显然不是简单的线性关系,而是随着温度和粘虫密度的变化而变化。根据模拟结果,得到河南驻马店地区亩产500斤以上的小麦在没有中华星步(虫甲)时,用粘粘虫散防治的经济阈值在小麦的不同生育期变动在22—34头/米~2之间,用灭幼脲防治时为每平方米14—23头。如果中华星步(虫甲)每100米~2增加2头,则经济阈值可相应地提高1—3头/米~2。
This paper reports a model of the three major natural enemies of wheat, armyworm and armyworm in the winter wheat ecosystem - the three sub-systems of Colosomachinense. At the same time, the three models were coupled to carry out daily dynamic simulation to determine the economic threshold of wheat at different growth stages and at different densities. The simulation results showed that the earlier the armyworm occurred, the smaller the economic threshold. At the same growth stage of wheat, the economic threshold increased with the increase of the density of A. sinensis, but obviously it was not a simple linear relationship, Temperature and armyworm density changes. According to the simulation results, the economic threshold of 500 kg or more of wheat per mu in Zhumadian area of Henan without ZMV was 22-34 / m ~ 2, with the control of diflubenzuron 14-23 per square meter. If China Starburst (pest) increased by 2 per 100m ~ 2, the economic threshold can be increased by 1-3 head / m ~ 2 accordingly.