论文部分内容阅读
为了寻找当地的天敌优势种群,进一步保护和利用自然天敌,发挥天敌对害虫的控制作用。笔者于1984—1985年对棉田几种主要捕食性天敌进行了系统观察,现将结果整理分析于后,供参考。一、主要类群及其发生概况棉田捕食性天敌是棉虫的优势类群,其具有种群数量大、生活周期长、繁殖系数高、捕食能力强等特点。经初步调查,棉田内主要捕食性天敌类群有:蜘蛛类为优势种群,占63.7%;其次是瓢虫类,占29.7%;再次是草蛉类和花蝽,分别占6%和0.6%。
In order to find the dominant populations of natural enemies, further protect and utilize natural enemies, and play a natural enemy’s control role on pests. In 1984-1985, the author systematically observed several predatory natural enemies in cotton field, and summarized the results for reference later. I. Major groups and their occurrences Predatory natural enemies in cotton fields are the dominant groups of cotton insects. They have the characteristics of large populations, long life cycle, high multiplication coefficient and predatory ability. After preliminary investigation, the main predatory natural enemies in cotton fields are: spiders are the dominant species, accounting for 63.7%; followed by the ladybugs, accounting for 29.7%; again, the grass mullet and stink bug, accounting for 6% and 0.6%.