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我市系稻麦两熟区,七十—八十年代初,水稻单双并存,1985年后为纯单季晚稻。三化螟在七十年代后期渐趋衰落,1981—1983年几近绝迹,随后逐年回升,1991年三代三化螟为害明显加重,全市单季晚稻白穗率平均0.56%,其中陈墓、周庄等西南地区及石牌,巴城沿阳澄湖边的村为害重,一般村白穗率为0.5—1%,重的为2—4%,严重田块竟达10—20%;其他地区一般白穗率0.1%左右,重的0.5—1%,严重田块3—5%。1 三化螟回升情况八十年代初,几乎查不到三化螟越冬幼虫,也诱不到成虫,田间见不到白穗团。从1984
The city of rice and wheat two ripening areas, seventies - the early eighties, rice single and double coexistence, 1985 after the single-season late rice. The stem borer gradually declined in the late seventies, almost disappeared in 1981-1983, and then rose year by year. In 1991, the damage caused by the three generations of rice stem borers was significantly aggravated. The rate of white spike in single-season late rice in the city was 0.56% on average, including Chen Tomb and Zhouzhuang And other Southwest China and Shipai, the village along the bank of Yangcheng Lake is heavily polluted, the general village white spike rate of 0.5-1%, 2-4% of heavy, serious field as high as 10-20%; other areas are generally white Spike rate of about 0.1%, heavy 0.5-1%, 3-5% of serious plots. Borer regrowth situation In the early 1980s, almost no check borer larvae of the rice borer, also luring adults, the field can not see white spike regiment. From 1984