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证实上年/上季病种和病草为初侵染源.查明湖南省早、晚稻该病发生发展的病情.早稻发病轻于晚稻.在35℃/40℃条件下,病害潜育期最短.系统调查杂交晚稻威优6号的病情发展,逐步回归分析气象因子对流行速率的影响.发现日平均温度是主导因素.测定2153个品种(系)的抗病性.呈抗病反应的仅32个(占1·4%),Dular,BJ1等表现高抗.大面积种植的品种均呈不同程度的威病性,其中尤以杂交稻发病最重.水稻分蘖至孕穗期最感病.种植密度大和增施氮肥病情加重.深水灌溉田发病重于浅水灌溉田,湿润灌溉田发病轻.对该病的综合防治提出了建议.
Confirmed the last year / last season the disease and grass as the primary source of infection.Determine the early and late rice in Hunan Province, the occurrence and development of the disease.The incidence of early rice is lower than late rice.Under the conditions of 35 ℃ / 40 ℃, the disease latent period The shortest.Systematic investigation late hybrid rice Weiyou 6 disease progression, and gradually regression analysis of meteorological factors on the prevalence rate.The daily average temperature was found to be the leading factor.Determination of 2153 varieties (lines) of the disease resistance was disease-resistant Only 32 (1.4%), Dular, BJ1, etc. The cultivars grown in large area all showed different degrees of malachite, especially the hybrid rice.The incidence of tillering to booting is the most in rice The density of planting and the increasing of nitrogen fertilizer aggravate.The incidence of deepwater irrigated fields is heavier than that of shallow irrigated irrigated fields and wet irrigated irrigated fields.