De Gong;Zhang Yan;Ou ZhenGui;Sang Wei-jun;Xiaomin Wan

College of Agriculture, Guizhou University, Guiyang 550025 (China);College of Agriculture, Guizhou University, Guiyang 550025 (China

brown patch;lathyris;euphorbia lathyris l.;pesticide effect test;the field;effect o

[Objective]The propose was to study the ccurrence law and prevention measures of brown patch in Euphorbia lathyris L..[Method]The pathogen of brown patch in E.lathyris was isolated and identified in Xingyi of Guizhou Province in 2008-2009 and the disease symptom observation and the field pesticide effect test were conducted out on this disease.[Result]The pathogen of brown patch in E.lathyris was caused by the fungus of Pseudoc ercospora sp.Its suitable growth temperature was 20-35 ℃,it occurrence peak was from June to September generally,and its field incidence of disease was 30%-60%.The field pesticide effect test showed that 5 kinds of pesticides like mancozeb and thiophanate-methyl in spraying on the leaf had some control effect on this disease,with the ralative control effect of 54.3%-82.5%.Among 5 kinds of pesticides,the control effect of mancozeb was better and that of tetracyclines copper was poor.[Conclusion]The study provided the theory reference for deep research on the high yield and quality cultivation of E.lathyris and it control of brown patch.