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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,
First, the preface Corn borer in the past in the vicinity of Beijing and Tianjin plains in Hebei, mainly to the first generation of damaging spring corn and other crops; in recent years with the farming system changes, the development of the second generation of serious damage to two sets of corn, and become intercropping corn ear Important pests of the period. At present, two sets of corn are used for prevention and control, and pesticide prevention and treatment are still prevailing all over the country, but there are still many problems. In recent years, Trichogramma dendrolimi Matsumura has been introduced to control the second-generation rice borer in other cities in Beijing. ideal. Whether chemical control or biological control, we must grasp the occurrence and development of the natural population of corn borer, and on this basis to establish a scientific forecasting approach to correctly guide the prevention and treatment. To correctly investigate the occurrence of corn borer, we must first understand the natural distribution of corn borer field distribution. Only on this basis can we formulate the correct field sampling method,