Investigations on the detection of bean diseases of Van Province

Diseased plant samples were collected from bean (Phaseolus vulgaris L.) fields of Van region in 1989. As the results of surveys, 51 fungus-infected and 4 virus-infected specimens were collected from 68 bean fields located in different locations. The pathogenic fungus isolates on beans in the region were identified as Alternaria alternata (35%), Fusarium solani (25%), Macrophomina phaseoli (17.5%), Drechslera sorokiniana (10%), Rhizoctonia solani (5%), Stemphylum sp. (5%) and Botrytis cinerea (2.5%). Virus infected specimens were mechanically inoculated to indicator plants and according to the mechanical inoculations and serological tests, the widespread virus agent was determined as bean yellow mosaic virus in the region.