The Pathogentic Identification Of Pea Root Rot And Evaluation Of Cultivar Resistance In The Cold And Humid Regions Of Gansu Privince, China

1The pea Fusarium root rot in the cold and humid regions of Gansu were caused byFusarium solani(Mart.)Sacc, Fusarium solani var. coeruleum, Fusarium semitectum, Fusariumdimerum and Fusarium trichothecioides. Beside the Fusarium pathogens, Glioeladiumcatenulatum,Glioeladium sp.and Alternaria. alternate also caused pea root rot.2The result of pathogenicity test suggested that F. solani, F. trichothecioides was strongpathogenicity. F. solani var. coeruleum was secondly; F. semitectum and F. dimerum were weakpathogens on pathogenicity. Alternaria alternate,Glioeladium catenulatum and Glioeladium sp.were weak pathogens on pathogenicity. The pathogenicity of differenent stairs from Alternariaalternate and Glioeladium catenulatum and Glioeladium sp. were variable.3Resistance of the pea varieties to the Fusarium root rot disease was evaluated.The resultsdemonstrated that the twenty pea varieties had different level of resistance to Fusarium root rotof pea. RZ-1-1was the most highly resistant to F. solani, F. solani var. coeruleum, F. semitectum,F. dimerum and F. trichothecioides. longwan1,CS1001,Haflia were sencondly. while gu2010was susceptible to these pathogen.4. The efficiency of seven fungicide screening tested in labtory on controlling the peaFusarium root rot disease. The results showed that seven fungicides within a certainconcentration range inhibited mycelial growth.8%Hymexazol AS showed that the inhibitionrate reached94.03%to F. solani.30%duofu WP was highly inhibition rate for5Fusariumpathogens. According to EC50,8%Hymexazol AS inhibited all Fusarium mycelial growth. TheEC50of70%Thiophanate-M to F.solani was3.02∕mL, Daconil to F.trichothecioides andF.semitectum were2.05and2.62, Zineb to F.dimerum was6.39, Carbendazim to F.solani var.coeruleum was0.12.