期刊论文

PRELIMINARY STUDIES ON THE OCCURENCE AND THE PREVAILING CONDITIONS OF RICE BACTERIAL LEAF STREAK(BLS)

中文

湖南农业大学学报(自然科学版)

1007-1032

1992

121-129

本校为第一机构

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.

The infected seeds/straw of the previous year/season, were the sources of primary infection. Incidence of the disease for early and late rice, through out the growth periods in Hunan was found. Its development curve for late rice was of an 'S' type, causing greater damage to thet early rice. At 35℃/40℃, the shortest latent period was. Systematic investigation of the correlation between the disease development and climate factors was analysed by stepwise regression.It was found that the daily average temperature was the most important factor a...