| 摘要: |
| 一、前言玉米螟过去在京津河北一带平原地区,主要以第一代为害春玉米等作物;近年来随着耕作制度的改变,发展到第二代严重为害二套玉米,又成为套种玉米穗期的重要害虫。目前在二套玉米上进行防治,各地仍以药剂防治为主,但存在不少问题;近几年北京市从外地引进松毛虫赤眼蜂(Trichogramma dendrolimi Matsumura)防治二代螟卵,效果也不理想。无论是进行化学防治还是生物防治,都必须掌握玉米螟自然种群的发生发展规律,并在此基础上建立科学的预测预报办法,以正确指导防治。要正确调查玉米螟的发生情况,必须首先了解玉米螟自然种群的田间分布型。只有在此基础上,才能制定正确的田间抽样方法, |
| 关键词: 玉米螟 平原地区 发生发展规律 聚集分布 田间分布型 自然种群 套种玉米 随机分布 春玉米 卵块分布 |
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| Abstract: |
| In this study,thirty nine intercropped corn fields of fourteen ty- pes with six varieties were observed,in which twenty one fields were determined as aggregative patterns and eighteen fields as random patterns,and in general tendency,however,they showed that they were primarily aggregative.Thebasic componenntsof the distribution pattern were mainly loose groups of the egg masses,or population groups. The distribution patterns of the second generation egg masses of corn borers in summer corn fields varied wi... |
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