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通过对桂林地区水稻稻纵卷叶螟迁飞情况与气象条件的对比分析,对影响桂林地区稻纵卷叶螟迁入迁出的气象因素有了比较清楚的认识;天气形势决定了大气的环流,850 hPa气流是决定稻纵卷叶螟迁飞方向和速度的主导气流,华南地区一致的偏西南气流是稻纵卷叶螟北迁的主要载体;温度和水稻生长期是决定稻纵卷叶螟起飞的主要因子,降水和下沉气流决定了害虫的降落地点,适宜稻纵卷叶螟迁入桂林的地面温度为19~28℃,空气湿度为70%以上,稻纵卷叶螟降落高峰期当天和前1 d有降水的概率为85.8%。
Through the comparative analysis of the migration situation and the meteorological conditions of rice leaf roller in Guilin area, we have a clear understanding of the meteorological factors that affect the migration and the migration of rice leaf roller in Guilin. The weather conditions determine the circulation of the air , 850 hPa airflow is the dominant airflow that determines the direction and speed of migratory rice leaf roller. The consistent southwest airflow in southern China is the main carrier of the rice leafroller north migration; temperature and rice growth is the decision of the rice leaf curl The main factor of stem borer takeoff, precipitation and downdraft determines the landing place of pests. The suitable temperature for the entry of Cnaphalocrocis medinalis into Guilin is 19-28 ℃ and the air humidity is above 70% The probability of precipitation on the day and the previous day is 85.8%.