Effect of blocontrol agents and natural plant extracts and oils on the growth of rhizoctonia solani, a pathogen on tomato, in vitro [electronic resource].

Includes references.

Survey on damping off and wilt diseases of tomato caused by Rhizoctonia solani was conducted at 6 counties in Oakahlia governorate, Egypt. A higher percentage of disease incidence (01) was detected in tomato beds in open fields when compared with seedlings produced in plastic trays at commercial nurseries in greenhouses. Disease incidence ranged from 0-18% in the surveyed fields. The highest 01 ratios were found in Bany Ebaid, EI-Manzala and Belqas Counties; while lower 01 percentages (0-12%) were recorded in counties of EIMansoura, Talkha and Aga. Data obtained in this study showed high antagonistic effect of Trichoderma viride, T. harzianum and T. hamatum that caused a significant reduction in the linear growth of R solani ranged from 62.5% to 72.73% after 7 days of incubation. Glioc/adium roseum had the least inhibition effect of the linear growth of the pathogen (40.91 %). All plant extracts caused significant reduction in the linear growth of R solani, which ranged from 18.89% to 100% after 7 days of incubation. Mint, onion, rocket, cinnamon and cabbage extracts caused a complete inhibition of the pathogen growth at 0.25 and 0.50 concentrations. Ginger extract caused inhibition ranged from 36.36% to 85.56%. Rocket and pepper extracts were ranked the least inhibitors of R solani linear growth.

Summary in Arabic.

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