摘要
持续低温（≤２０℃）３～５天，有利于病菌侵入和病斑扩展。持续降水４天左右或结露８ｈ以上，有利于病害的发展。抗病品种对温度、降水时数变化的反应较稳定。温度偏低或施氮量增加，则明显削弱品种的抗病性。稻株体内与抗性相关的物质差异明显。上述结果对病害预测预报及防治具有重要意义。
This paper reported the relationship betweem the successive time about factors including low temperature, precipitation, dew, et al. and rice blast disaster. The result showed that:(1) sustainable low temperature for 3～5 days favored pathogenic infection and lesion spread. (2)sustainable precipitation for 4 days favored lesion spread. (3)the resistance of resistant varieties were stable in spite of the changes of temperature and precipitation; low temperature and a lot of N fertilizers significantly decreased the resistance of rice, and the resistant substance in rice also indicated remarkably differences. (4) precipitation for more than 8 hours increased the rate of lesion spread.
出处
《西南农业大学学报（自然科学版）》
CSCD
1998年第5期392-396,共5页
Journal of Southwest Agricultural University
基金
"九五"国家重大科技攻关计划资助
