Identification and pathogenicity of Fusarium spp. associated with sugarbeet root in Karaj region

Document Type : Scientific-Extension

Authors

1 College ofAgriculture. University of Tehran, Karaj, Iran

2 Sugar Beet Seed Institute, Karaj, Iran

Abstract

To identify the Fusarium species pathogenic on sugar beet causing root rot samples of infected roots were collected from sugar beet fields in Karaj region during growing season of l 998- 99. Infected roots were washed. surface sterilised and plated on acidified PDA. From 223 isolated Fuasrium samples, 6 species such as: F solani (l 70 isolates), F oxysorum (20 isolates), F culmorum (5 isolates), F. proliferatum (4 isolates), F. nygami (17 isolates), F. equiseti (7 isolates) were identified. A few isolates from each fusarinm species were used for pathogenicity tests on 30 days old sugar beet plants, using conidial suspension and oat meal + sand inocula. The results showed that F oxysporum, F. nygamia and F solani proved to be pathogenic on sugar beet.

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