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比较并分析安庆市1997,2005年和2006年褐飞虱Nilaparvata lugehs(Stal)大发生的虫源、气候条件。1997年,迁入期偏早,初迁虫量大,到7月26日止,单灯累计诱量为1228~8698头;7、8月份气温比历史均值低0.2~1.3℃,导致单季稻上基数适温协同暴发型;再迁补充虫源峰次较多,但9月份气温比历史均值低1.0℃,抑制了双季晚稻褐飞虱发生。2005年,迁入期较早,但初迁虫量低,到7月26日止,单灯累计诱量为200~3334头;7月中旬至8月份气温比历史均值低0.4~0.8℃,9月至10月中旬气温比历史均值高1.8~2.2℃,有利褐飞虱发生的气候条件长达3个月;同时,夏、秋季台风暴雨频繁,再迁补充虫源丰富,8月16日~9月25日每侯灯下≥1000头的回迁峰次多达5个,分别比1997年和2006年多1个和2个,导致多代连续重发。2006年,迁入期早,6月底以前的早迁虫量分别是1997年和2005年同期的6.4倍和2.1倍,初迁虫量大,到7月26日止,单灯累计诱量为1595~7181头;虽然7、8月份气温比历史均值高1.0~2.0℃,但单季稻田间小气候适宜,构成单季稻基数暴发型;再迁补充虫源峰次较少,但8月底~9月初短期内大量集中迁入,9月下旬至10月份气温异常偏高,高于历史均值1.5~3.0℃,引起晚稻持续重发。
Compared and analyzed the insect source and climatic conditions of Nilaparvata lugehs (Stal) in Anqing city in 1997, 2005 and 2006. In 1997, the immigration period was earlier and the number of migratory worms was larger. As of July 26, the total single-lamp light harvesting quantity was 1228-8698; in July and August, the temperature was 0.2-1.3 ° C lower than the historical average, The base temperature was synergistic with the outbreak; the migratory replenishment source peaked more frequently, but the temperature in September was 1.0 ℃ lower than the historical average, inhibiting the occurrence of brown planthopper in the double season late rice. In 2005, the immigration period earlier, but the initial population is low, until July 26, the single lamp cumulative total of 200 to 3334; mid-July to August than the historical average temperature 0.4 ~ 0.8 ℃, From September to mid-October, the temperature is 1.8-2.2 ℃ higher than the historical average, which favors climatic conditions of brown planthopper occurring up to 3 months. Meanwhile, typhoons in summer and autumn are characterized by frequent rains and rich sources of replenishing insects. August 16 to 9 As many as five migratory peaks ≥1000 heads per month on the 25th were more than one and two more respectively than in 1997 and 2006, resulting in multiple generations of continuous retransmission. In 2006, the number of early migrated pests before the end of June and before the end of June were 6.4 times and 2.1 times higher than those of the same period of 1997 and 2005, respectively. The number of newly arrived pests was large. By July 26, 1595 ~ 7181 head. Although the temperature in July and August was 1.0 ~ 2.0 ℃ higher than the historical average, the microclimate was suitable for single-cropping paddy field, A large number of concentrated move in late September to October abnormal high temperature anomaly, higher than the historical average of 1.5 ~ 3.0 ℃, causing continuous rice late recurrence.