稻曲病侵染时期和流行因素研究

Study on infection period and epidemic factors of rice false smut

分期接种试验的结果表明,稻曲病对水稻的侵染时期,主要在孕穗末期至破口期,病菌侵入籽粒在水稻开花前。3a的系统调查和对比分析结果说明,水稻穗期最高气温>32℃的天数少,降雨量大,有利病菌的侵入和发展流行,品种间抗(耐)病性差异显著。近年来稻曲病发生严重的主要原因是单季晚稻的大面积种植,穗期气候条件适宜病害发生流行。

Inoculation experiments on rice false smut in different periods have been carried out, results showed that the major infection period was 7days before spikes; spores infected rice before it flowered. Through 30-days systemic investigation, it was revealed that infection and development of rice false smut was favored by fewer days in which the highest daily temperatures were below 32℃during spike period, and heavy rain; The abilities of varieties resistant or tolerant against the disease were very different. Late single crop rice was planted in large areas and climate conditions favored the disease during spike period in recent years, which lead to the outbreak of rice false smut.