Effects of Lodging on Winter Wheat Diseases Occurrence and Yield

DONG Xiuchun; HAN Wei; YANG Hongbin

doi:10.15933/j.cnki.1004-3268.2016.04.006

Abstract：For understanding the effects of wheat lodging during later development period on diseases occurrence and yield reduction, different lodging time and degree experiments were used for systematic and quantitative study. The wooden stick was used for overwhelm wheat simulated lodging by strong wind. Effects of different treatments on the wheat diseases,premature senility,maturity,yield and its components were analyzed. The results showed that wheat lodging from flowering to filling finished mainly aggravated occurrence of sharp eyespot and powdery mildew,and both of them showed the third grade. For one thing, wheat had premature senility and advanced maturity easily, and difference of disease grade of treated group compared to control group was even more significant as early of lodging. For another,both of flat and inclined lodging enabled wheat kernels per spike and the thousand-kernel weight to decrease and then led to severe reduction of yield. Moreover,the effects order of lodging time on yield,kernels per spike and the thousand-kernel weight were anthesis stage＞initial grain filling stage＞mid-filling stage＞late filling stage successively. The yield losses caused by flat lodging at above four stages were 25. 9%,21. 1%,10. 1%and 4. 0% respectively,while by inclined lodging were 9. 1%,7. 6%,5. 0% and 1. 9% respectively. Further,flat lodging had more effects in all the above aspects of wheat than that of inclined lodging. Therefore,when the yield loss at the late development stage was to assess, the lodging period could be regarded as the primary evaluation basis,and then combined with lodging degree for synthetic analysis.