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粘虫是辽宁省重要害虫之一,主要为害小麦、谷子、玉米、高粱等,个别年分也为害水稻。常因其突发性和暴食性,造成严重减产。本地区周年发生两次为害,第一次(二代)系常发世代,发生频率约占72%,第二次(三代)系偶发世代,发生频率约占20%。为准确地做好二代、三代预测预报,以本所1951～1980年粘虫消长资料为依据,试将锦州地区粘虫发生世代、虫源性质及大发生因子进行探讨,供粘虫预测预报工作参考。一、发生世代(一)成虫消长依据本所1951～1980年粘虫消长资料。本地区最早始见成虫于3月25日(1959年),最晚终见成虫于11月16日(1961年)。周年出现4次成虫峰期,分布于4月中旬,6月上旬,
Mythimna separata is one of the most important pests in Liaoning Province. The main infestation is wheat, millet, corn, sorghum and so on. Individual year also affects rice. Often due to its sudden and binge eating, causing serious cuts. The second anniversary of the birth of the region occurs twice, the first generation (second generation) is a common generation, the frequency of about 72%, the second (third generation) is a sporadic generation, the frequency of about 20%. In order to accurately predict the second generation and the third generation, based on the data of the population growth, population and occurrence of armyworm in Jinzhou from 1951 to 1980, Work reference. First, the occurrence of generations (A) the growth and decline of adults according to the Institute from 1951 to 1980, armyworm growth and decline of information. The first adults in the area to see adults on March 25 (1959), the latest see adults on November 16 (1961). Anniversary appeared four adult peak, distributed in mid-April, early June,