PATHOGENICITY OF RHIZOCTONIA SOLANI, THE CAUSAL AGENT OF CROWN AND ROOT ROT OF CUCURBITS IN IRAN

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MIRMAJLESSI S.M.; SAFAIE N.; MOSTAFAVI H.A.; MAHMOUDI S.B.

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Journal: JOURNAL OF RESEARCH IN PLANT PATHOLOGY Year:2011 | Volume:1 | Issue:1 Page(s): 27-35

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Title

PATHOGENICITY OF RHIZOCTONIA SOLANI, THE CAUSAL AGENT OF CROWN AND ROOT ROT OF CUCURBITS IN IRAN

Author(s)

MIRMAJLESSI S.M. | SAFAIE N. | MOSTAFAVI H.A. | MAHMOUDI S.B. | Issue Writer Certificate

Keywords

AG4Q3

CROWN AND ROOT ROTQ3

CUCURBITSQ2

PATHOGENICITY TESTQ2

RHIZOCTONIA SOLANIQ3

Abstract

The cucurbit damping off, root and crown rot caused by RHIZOCTONIA SOLANI Kuhn are the most important diseases of these crops. In a survey of fields and greenhouses during 1384-1385 samples of cucumber, pumpkin, watermelon and melon, suspected of being infected by Rhizoctonia in Tehran, Mazandaran, Khouzestan and Isfahan provinces were collected and the fungus was isolated. In this study, 59 isolates of R. solani were recovered from soil, crown and roots of cucumber, pumpkin, watermelon and melon. Hyphae width ranged from 4.46 to 6.86 mm, and all of them were multinucleate. Anastomosis grouping showed that 81% of samples belonged to AG4 and the rest of isolates did not anastomose with either of the standards AG2 and AG7. The results of PATHOGENICITY TEST showed that of the 59 recovered isolates, 97% were pathogenic, which in turn were classified in 10 separate categories based on their virulence. In this investigation two isolates of pumpkin and cucumber belonging to AG4 from Isfahan province appeared to be non pathogenic. This is considered to be the first report AG4 on pumpkin in Iran.

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