葉いもち病斑上における胞子形成能に及ぼすイネへの窒素追肥の影響
1995 年 1995 巻 42 号 p. 31-34
詳細
1995 年 1995 巻 42 号 p. 31-34
To obtain the information about the effect of nitrogen application to rice plants on severity of blast disease epidemics, sporulation capacity of the disease lesions, a component of the epidemic, at various application timing was examined. Nitrogen topdressing applied from 9 days before to 4 days after infection of a blast fungus to rice plants increased the potential sporulating ability of the leaf lesions. The sporulating ratio of the lesions on treated/untreated rice plant is represented as y=-0.018t+1.88, where y is the ratio and t the infection time (days) after nitrogen topdressing, respectively.
