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我们从事测报实践、观察螟虫三十年来发现:螟虫越冬代发生量,是和上年越冬基数、冬季和次年春末寒潮的次数多少、强度大小显著相关;第一代螟虫的大量繁殖与分蘖壮秧(适宜的饲料)多、寄生天敌少和防治水平低相关;螟虫特大发生,必须有大量螟虫基数,大量的蚁螟与稻酮含量低的水稻生育期,即 N/C 高的生长期(分蘖期、孕穗含苞期)相吻合,有适宜的温度(25—29℃)、湿度(闷热多阴天、小雨)条件。
We are engaged in the practice of surveying and mapping to observe the occurrence of stem borers over the past three decades. The occurrence of stem borers overwintering generations is significantly related to the number of overwintering baselines in the previous year, the number of cold spells in winter and the late spring and the intensity of the intensity of the first generation of stem borers. There are a lot of stem borer base and a large number of rice stem borer and rice paddy with low content of rice growth period, that is, the high N / C growth period ( Tillering stage, booting ear booting phase), there is a suitable temperature (25-29 ℃), humidity (hot and cloudy, light rain) conditions.