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通过2年的田间小区人工接种试验,观察比较了玉米大斑病、弯孢叶斑病和灰斑病单独及混合发生时的流行过程及对玉米产量损失的影响。结果表明,在病害混发初期,病害间无明显的负相关性,随着病情的发展,病害间的负相关性逐渐增大并达到显著水平,说明病害间有明显的抑制作用。病害混发时造成产量损失并不完全等于各病害单独造成损失之和,其中大斑病和弯孢叶斑病、弯孢叶斑病和灰斑病混合发生所造成的损失约为各病害单独造成损失之和的76%～88%,大斑病和灰斑病混合发生所造成的损失可近似看作两种病害各自引起产量损失之和,3种病害同时发生时最终损失率约为各自造成损失之和的67%～72%。
Through two years of artificial inoculation experiments in field plots, the epidemic process of corn leaf spot, leaf curl leaf spot and gray leaf spot alone and in combination and the impact on maize yield loss were observed and compared. The results showed that there was no obvious negative correlation between the diseases during the early phase of disease mixing. With the development of the disease, the negative correlation between the diseases gradually increased and reached a significant level, indicating that the disease was significantly inhibited. Yield loss caused by disease mixed hair is not equal to the total loss of each disease and the sum of which the spotted and Curvalaria leaf spot, Curvalaria leaf spot and gray spot mixed caused by the loss of about the disease alone Resulting in 76% to 88% of the sum of the losses. The loss caused by the mixed occurrence of the big leaf spot and the gray spot spot can be regarded as the sum of the yield losses caused by the two diseases respectively. The final loss rates of the three diseases are about the same The sum of the loss caused by 67% ~ 72%.