Abstract
Basal rot is the main and economically soil-borne disease of onion that caused by various Fusarium species worldwide. To identify the prevailing Fusarium species, 140 Fusarium isolates were obtained from red onion bulbs farms in 10 regions of East and West Azarbaijan provinces in 2015. By inoculating 80 selected isolates, 40 of them were pathogenic on onion. These 40 isolates were identified as F. oxysporum with 43.62%, F. subglutinans with 44%, F. culmorum with 50.66%, F. avenaceum with 51%, F. solani with 42.41%, F. crookwellens with 55%, F. proliferatum with 47.16% and F. redolens with 55.5% virulence. Their frequency were 20%, 2.5%, 7.5%, 5%, 42.5%, 2.5%, 15% and 5%, respectively. Forty studied isolates demonstrating that, 14.2% were highly virulent, 26.1% virulent, 40.3% moderately virulent and 19.4% weakly virulent. This is the first report of F. avenaceum and F. crookwellens as the causal agents of red onion basal rot in Iran.
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