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三化螟在赣中地区每年发生四代,如九月下旬至十月上旬气温偏高(日平均气温在22℃以上)则有不完整的第五代。山区则有三代幼虫过冬现象。一般一、三代为害造成枯心苗,二、四代为害造成白穗,以混栽区或纯双季稻地区发生数量大,为害严重,而单季早、中、晚稻为主地区,因其发生前后期缺乏充足食料,对其生存繁殖极为不利,因此发生数量小,为害亦轻。
Stem Borer occurs in four generations each year in Ganzhong area. From late September to early October, there is an incomplete fifth generation with high temperatures (average daily temperature above 22 ℃). There are three generations of mountain larva winter phenomenon. General one or three generations of victims caused by dead seedlings, two or four generations of harm caused by white spike, mixed cropping areas or pure double cropping areas occur in large quantities, serious damage, and single season early, middle and late rice-based areas, because of its Lack of adequate food before and after the occurrence of its survival and reproduction is extremely unfavorable, so the occurrence of a small number of damage is also light.