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地处北纬25度附近的始兴县双季连作稻区,多年来三化螟的发生数量逐代递增,为害程度早稻轻,晚稻重。尤以第四代为害晚稻后期,往往导致严重减产。作者于1980和1981年,在该县城南公社稻田,进行了三化螟第三、四代种群数量变动的调查研究。当地第二代三化螟蛾(旧称第三代)产卵盛期在7月中、下旬之间,这时交错并存着的田类有:作为第三代虫源的早稻已收而未及翻
Shixing County, located in the vicinity of 25 degrees north latitude continuous cropping rice area, over the years the number of occurrence of Borer increased by generations, the degree of damage of early rice light, late rice weight. Especially the fourth generation of late rice damage, often lead to serious cuts. In 1980 and 1981, the author conducted a survey on the population changes of the third and fourth generations of the rice stem borer (Chilo suppressalis) in the paddy fields of Chengnan commune in the county. The second generation of the local population of the third generation of Pythium moth (formerly known as the third generation) spawning peak in mid-July, late at this time staggered exist fields are: as the third generation of early rice has not yet received the early rice turn