一、新法的提出 研究表明,麦类赤霉病的发病轻重,主要取决于抽穗后的相对湿度,病原菌的数量则是无关紧要的。因为菌源无处不有,而且繁殖速度很快。大范围的湿度高低,决定一个地区、某一时期抽穗的麦子的发病轻重,而小范围(穗部)湿度的大小,则是不同品种间发病轻重的原因。之所 First, the proposed new law Studies have shown that the severity of wheat scab belongs mainly to the relative humidity after heading, the number of pathogens is irrelevant. Because of bacteria everywhere, but also reproduce quickly. A wide range of humidity level determines the severity of the heading of wheat in a region and at a certain time. The small-scale (panicle) humidity is the reason for the severity of the disease in different regions. The place