Effectiveness of Four Fungicides Against Alternaria, Fusarium, and Helminthosporium Causing Root-Rot and Leaf Spot Diseases on Wheat

Abstract

Field experiments, and laboratory tests were conducted to evaluate the efficacy of four commercial formulations of fungicides, against root-rot and leaf spot diseases of wheat, the formulations contained carbendazim , and three of them were ready-mix combinations of carbendazim and triazol fungicides. The formulations included cyproconazol / carbendazim ( Alto-Ambel, 46 % SC ); Flutriafol / carbendazim ( Shafy, 24.4 % SC ); Propiconazol / cabendazim ( Tilt CB, 18.75 % SC ) and Carbendazim ( 50 % WP ). Test fungi were Alternaria tritici, Fusarium graminearum and Helminthosporium sativum . Results of laboratory tests indicated that, Alto-Ambel formulation showed the strongest inhibitory effect of H. sativum hyphal growth , followed by Shafy and Tilt CB formulations. Carbendazim exhibited the strongest effect against F. graminearum , but without appreciable effect on either A. tritici or H. sativum hyphal growth. Field experiment showed that, application of any of the formulations on wheat, 4 –5 weeks after seeding produced good control of root-rot and leaf spot diseases of wheat, and Alto-Ambel ( 46 % SC ) was the strongest in decreasing disease severity of leaf spot caused by Alternaria and Helminthosporium, whereas Tilt CB (18.75 % SC) was the strongest against root-rot caused by Fusarium and Helminthosporium. Combination formulations ( Alto-Ambel , Shafy and Tilt CB ) showed an effective reduction in the percentages of the presence of Helminthosporium and Alternaria in leaf spot disease and of Fusarium in root-rot disease of wheat plants.