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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。
The results of staging inoculation showed that the infection stage of rice false smut was mainly at the booting stage to the breaching stage, and the bacteria invaded the grain before the flowering of rice. The results of systematic investigation and comparative analysis of 3a indicated that the number of days with the highest temperature of> 32 ℃ and the heavy rainfall in the heading stage of panicle led to the invasion and development of favorable bacteria. In recent years, the main reason for the serious occurrence of false smut is the large-scale planting of single-season late rice, and the suitable climatic conditions at the heading stage are prevalent.