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近年来,由于一年三熟的新耕作制度不断发展,作物病虫害的发生也相应频繁。特别是稻瘿蚊已从山区向平原扩展,过去珠江三角州多在大沙田区发生,现在已逐渐扩展到丘陵地区去。1975年全省已有74个县、市不同程度地发生,对中稻和晚稻造成严重威胁,一般标葱率达到5-10％,有的甚至遭受减产。针对这个问题,我们与工农兵学员分别到花县、新会等县的社队,与当地贫下中农和科技人员共同调查研究稻瘿蚊的生活习性、发生规律和防治措施,进一步明确了它发生的主要因素是与虫源基数、耕作栽培、气候条件、天敌和人为防治等有密切关系,并进行一些防治试验。现将防治原则和方法提出如下意见。
In recent years, crop diseases and pests have also taken place frequently due to the continuous development of new cropping systems that are well-established throughout the year. In particular, rice gall midge has expanded from the mountain to the plains. In the past, the Pearl River Delta mostly occurred in the Sha Tin area. It has now gradually expanded to the hilly areas. In 1975, 74 counties and cities in the province had occurred to varying degrees, causing serious threats to middle and late rice. The average rate of scallion was 5-10%, and some even suffered from the decrease in yield. In response to this question, we and the workers, peasants and soldiers each went to the communes and communes in Huaxian County and Xinhui Counties to investigate and study the living habits, law of occurrence and prevention measures of rice gall midge, together with the poor peasants and scientific and technological personnel in the area, further clarifying that it happened The main factors are insecticidal base, cultivation and cultivation, climatic conditions, natural enemies and human prevention and control are closely related, and some prevention and control tests. Now the prevention and treatment principles and methods put forward the following opinions.