EFFECT OF BIOCONTROL AGENTS AND NATURAL PLANT EXTRACTS AND OILS ON THE GROWTH OF Rhizoctonia solani, A PATHOGEN ON TOMATO, IN VITRO

Elsheshtawi, A. M.; El-Gazzar, T. E.; AbouTabl, A. H.; Ebid, M. A.

doi:10.21608/jppp.2012.83676

EFFECT OF BIOCONTROL AGENTS AND NATURAL PLANT EXTRACTS AND OILS ON THE GROWTH OF Rhizoctonia solani, A PATHOGEN ON TOMATO, IN VITRO

Document Type : Original Article

Authors

¹ Plant Pathology Department, Faculty of Agriculture, Mansoura University, Mansoura, Egypt

² Department of Vegetables and Floriculture, Faculty of Agriculture, Mansoura University, Mansoura, Egypt

10.21608/jppp.2012.83676

Abstract

Survey on damping off and wilt diseases of tomato caused by Rhizoctonia solani was conducted at 6 counties in Dakahlia governorate, Egypt. A higher percentage of disease incidence (DI) 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 DI ratios were found in Bany Ebaid, El-Manzala and Belqas Counties; while lower DI percentages (0-12%) were recorded in counties of ElMansoura, 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. Gliocladium 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.

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