Disease Grading Criterion and Assessment of Yield Loss Caused by Maize Rough Dwarf Disease

• Published in: 植物病虫害研究：英文版 Vol. 3; no. 1; pp. 1 - 4
• Main Author: TAN Gen-jia DONG Meng SHEN Jing-ting WANG Xiang-yang GONG Xu MENG Zhao-peng GAO Jing-tang
• Format: Journal Article
• Language: English
• Published: 2012
• Subjects: 植物保护; 植物检疫; 植物病虫害; 预防
• ISSN: 2152-3932

[Objective] The paper was to study the disease grading criterion and assess the yield loss caused by maize rough dwarf disease. [Method] The ear lengths and yields of each healthy and infected plant of 5 cultivars were measured during 2009 and 2010. The severity grading criterion was deduced according to the ear length ratios. [Result]When the ratios were 0.92-1.00, 0.67-0.91, 0.41-0.66, 0.10-0.40 and 0, its corresponding disease grading criterions were 0, 1, 3, 5 and 7, respectively. The severity grading criterion was closely correlated to the yield loss. By analyzing the data of disease indexes and yield loss rates of 27 cultivars with DPS （Data Processing System）, the regression equations were established respectively. According to the comparison with each other, the Weibull Model was proved to have the highest fitting degree. Validating with the disease indexes of 27 cultivars in 2010, the equation supported the feasibility of the equation to predict the yield loss caused by maize rough dwarf disease. [Conclusion] The paper provided theoretical basis for further study on maize rough dwarf disease.