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一、越冬习性考查 1.越冬场所调查:台湾稻螟Chilotraea auricilia(Dudgeon)幼虫越冬场所主要是在稻根内,几年来的田间调查资料指出:以中稻田稻根内密度较大;晚稻田稻根内密度较小。此外,中、晚稻稻草内也有幼虫越冬,但密度很小,约占0.06％株。作者曾先后在百色专区的百色、田东、靖西、睦边、东兰、田林等县实地解剖观察高粱稈、玉米稈、小米稈、甘蔗宿根等均尚来发现有越冬幼虫。 2.虫口密度与稻田的关系:1)与稻田耕作制度有关。中稻田台湾稻螟越冬幼虫最多,每苗平均有效越冬幼虫4,745头,占4种稻螟总数的37.5％,二化螟次之,占30.39％,大螟较少,占25.2％,三化螟最少,占6.88％。晚稻田台湾稻螟越冬幼虫较少,每亩平均有效越冬幼虫540头,占4种稻螟总数的14.06％,二化螟也少,占13.14％,大螟最少,占
Overwintering Habitual Investigation 1. Overwintering Site Survey: The overwintering sites of Chilotraea auricilia (Dudgeon) larva in Taiwan are mainly within the roots of rice. Field survey data over the past few years indicate that: the inner density of rice roots in mid-rice fields is relatively large; the late rice fields Root density within the smaller. In addition, middle and late rice larvae also overwinter, but the density is very small, accounting for about 0.06% strains. The author has successively observed the observation of sorghum stalks, corn stalks, millet stalks, sugar cane stubs and other overwintering larvae in the areas of Baise, Tiandong, Jingxi, Mudian, Donglan, Tianlin and other counties in Baise Prefecture. 2. Insect population density and rice relations: 1) and rice farming system. The overwintering larvae of Taiwan’s rice borer were the most in mid-rice field, with 4,745 pairs of overwintering larvae per plantlet, accounting for 37.5% of the total. The number of overwintering larvae was 30.39%, and the number of stem borer was 25.2% At least, accounting for 6.88%. There were fewer overwintering larvae of late rice paddy rice in Taiwan, with 540 effective wintering larvae per acre, accounting for 14.06% of the total, and 13.1% less for the stem borer, while the stem borer was the least, accounted for