【摘要】 本文通过在水稻的3个时期接种,发现最佳接种时期为破口前7 d,说明稻曲病菌的最佳侵染时期为水稻破口前1周。用正交试验对影响人工接种稻曲病发病率的条件进行研究。结果表明,水稻品种、播种时间、氮肥水平三因子里,对稻曲病发病严重度影响最大的是水稻品种,播种时间在不影响水稻正常生长时,越晚越有利于稻曲病发病。氮肥水平对稻曲病发病严重度的影响相对较弱。更多还原

【Abstract】 Inoculation conditions for false smut of rice( caused by Ustilaginoidea virens( Cooke) Tak) was studied under field condition. Among three inoculation stages of rice,the case inoculated 7 d before emergence of panicle resulted in optimum diseased effect,the best infection period of U. virens was 7 d before emergence of panicle,and the factors affecting incidence rates of rice false smut were studied with orthogonal design by means of artificial inoculation on field. The results showed that the varieties were the greatest factor of effect,the later sowing time was helpful for disease occurrence,and the level of nitrogen fertilizer had less effect.更多还原