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太原市郊水稻产区,二化螟逐年上升,严重地块减产达4%。我们经过调查研究,提出以下一些防治措施。一、农业防治1.拾烧稻茬:二化螟以老龄幼虫在稻茬和稻草中越冬,据调查,收割时稻茬中虫量达88%,稻草中占12%。调查中还发现,不同品种间稻茬的越冬含虫量存在明显差异。以稀植、秆粗壮、叶宽大、色浓绿的品种越冬含虫量较高。以种植密度大、茎秆矮细,分蘖高的品种的越冬含虫量较低。把稻茬人工拾集,然后集中埋掉或者烧毁,可压低越冬虫源基数。2.灌水翻地:每年5月中旬前,在稻茬中越冬的二化螟还没有进入羽化盛期时,
Taiyuan suburban rice producing areas, Chilo suppressalis increased year by year, a serious mass production reduction of 4%. After investigation and study, we put forward the following prevention and control measures. First, the prevention and treatment of agriculture 1. Picked rice stubble: Chilo suppressalis larvae in the old rice and winter overwintering, according to the survey, harvesting rice stubble 88%, straw accounted for 12%. The survey also found that different varieties of rice stubble overwintering insect population there are significant differences. Sparsely planted, stout stout, broad leaves, dark green color varieties overwintering insect population. To planting density, short stalk, high tiller varieties overwintering insect population. The rice stubble manually collected, then concentrated buried or burned, can reduce the base number of overwintering insects. 2 irrigation turn: every year in mid-May before the winter stubble in the rice stubble has not yet entered the eclosion peak,