论文部分内容阅读
棉花油菜间作已被公认为成功经验,小麦带种油菜在魏县则刚有零星种植,为探索其开发利用价值,近几年来我们对此进行了一些研究,并得出以下见解: 一、小麦带种油菜有利于保护麦蚜的天敌。油菜属十字花科,春季开花早,花期长,可招引大量天敌,有效地控制麦蚜的发生。据1982年调查,油菜田比小麦田瓢虫高峰期早5天,每平方米瓢虫量多4.5头,而此期也正是小麦蚜虫的防治适期。1984年小麦抽穗期调查,纯作麦田每平方米有瓢虫1.4头,食蚜蝇幼虫0.8头,小麦带种油菜田每平方米有瓢虫3.7头,食蚜蝇幼虫5.2头。1987年5月19日调查,小麦带种油菜田每平方米瓢虫和食蚜蝇幼虫比纯麦田分别多26.7-44.8头和0.2
Cotton rapeseed intercropping has been recognized as a successful experience, wheat rapeseed in Wei County has just been sporadic planting, in order to explore the value of its development and utilization, we have done some research in recent years, and came to the following observations: First, wheat With rapeseed is conducive to the protection of wheat aphid natural enemies. Rape is a cruciferous, flowering early spring, long flowering period, can attract a large number of natural enemies, effectively control the occurrence of wheat aphids. According to the 1982 survey, the rape field was 4.5 days earlier than the peak of the ladybug in the wheat field, and the number of ladybugs per square meter was 4.5, which is also the optimum period for prevention and control of wheat aphids. In 1984, the investigation of heading stage of wheat showed that there were 1.4 ladybugs per square meter in pure wheat field and 0.8 young hoverfly larva per hectare. There were 3.7 ladybugs per square meter in wheat rape field and 5.2 larvae per hoverfly. May 19, 1987 survey, wheat rapeseed fields per square meter Ladybird and hoverfly larvae were more than the pure wheat field 26.7-44.8 and 0.2