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1991年河北省唐山、泰皇岛、廊坊等冀东水稻产区稻飞虱暴发成灾,主要是褐飞虱约占70—80%,白背飞虱占20—30%。200多万亩水稻均有不同程度的发生,受害严重的达100万亩。昌黎县9月调查,一般每丛100～200头,高的达200头以上。滦南县9月10日调查,一般每丛2000～3000头,严重的每丛5000头,单叶有虫67头。稻飞虱的严重发生,虫口数量之大,危害之重实属历史罕见。由于防治不及时,使冀东稻区造
In 1991, outbreaks of rice planthopper in the rice producing areas of Jidong, Hebei Province, such as Tangshan, Taihuang Island and Langfang of Hebei Province, were mainly caused by 70-80% of the brown planthopper and 20-30% of the whitebacked planthopper. More than 200 million mu of rice have different degrees of occurrence, seriously harmed 1000000 mus. Changli County in September survey, generally every 100 to 200, up to 200 high. Luannan County survey on September 10, generally 2000-2000 per bunch, 5000 serious per bundle, 67 single leaf worms. The serious occurrence of planthoppers, the population of insect population, the harm is indeed a rare history. As the prevention and treatment are not timely, Jidong area is built