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褐飞虱在桐城市演变可划分为 3个阶段 :1971年以前 ,1972～ 1982年 ,1983年至今 ;灯下迁入期、迁入量、大发生频率、主害代别等在 1977～ 1983年、1984～ 1991年、1999～ 2 0 0 3年均有所不同 ;2 0世纪 80年代以前六 ( 4 )代为主害代 ,80年代后发生为害盛期提前 ,五 ( 3 )代为主害代 ;褐飞虱短翅型成虫单季稻田初见期在 7月下旬至 8月上旬 ,双晚稻田初见期在 8月中下旬至 9月上旬 ;影响褐飞虱发生的主要因素有气象、耕作制度、药剂、迁入量等 ,品种、天敌对发生量也有一定影响。
The brown planthopper in Tongcheng City can be divided into three stages: before 1971, from 1972 to 1982, from 1983 until now; during the period of moving in, the amount of moving in, the frequency of occurrence, the frequency of major occurrence, etc. During 1977-1983, From 1984 to 1991 and from 1999 to 2003, they were all different from 1999 to 2003. Six (4) generations were the dominant offspring in the 1980s, and the peak of damage occurred in the early 1980s. Five (3) generations were the dominant offspring. Short-winged adults of the brown planthopper short-winged single-season rice fields early in late July to early August, double-late rice fields early in mid to late August to early September; the main factors that affect the occurrence of brown planthopper meteorological, farming systems, pharmaceuticals, Into the amount of varieties, natural enemies also have a certain impact on the amount of occurrence.