论文部分内容阅读
近些年来,早稻稻瘟病的发生有逐年加重的趋势,部分地方甚至还流行成灾。因此,对其防治不能掉以轻心。1.流行的主要原因(1)与品种抗性有关不同品种或同一品种不同地域、不同生育期对稻瘟病的抗性存在着差异。在当前推广的早稻品种中,高抗或抗性强的品种并不多,即使是抗性品种在种植3~5年后,其抗性也呈下降趋势。同一品种
In recent years, the occurrence of rice blast in early rice has been increasing year by year, and some places are even endemic. Therefore, its prevention and treatment can not be taken lightly. 1. The main causes of the epidemic (1) Resistance to different varieties or varieties of the same species and regions, different growth stages of rice blast resistance differences exist. Among the varieties of early rice that are currently being promoted, there are not many varieties with high resistance or resistance, and even the resistant varieties have a tendency to decline after 3 to 5 years of planting. The same species