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Plant Pathology Journal
Year: 2008  |  Volume: 7  |  Issue: 1  |  Page No.: 27 - 33

Effect of Environmental Conditions on Wilting and Root Rot Fungi Pathogenic to Solanaceous Plants

El-Sayed A. Fayzalla, Yasser M. Shabana and Nasser S. Mahmoud    

Abstract: Twenty three isolates of Fusarium oxysporum, eight isolates of Fusarium solani, two isolates of Verticillium dahliae and four isolates of Rhizoctonia solani were isolated from tomato plants showing wilting and root rot symptoms at different localities in Dakahlia governorate, Egypt. These isolates varied in their aggressiveness against tomato plants. The influence of temperature, pH, light regime, sealing culture plates with Parafilm (1-10 layers) and type of media on the growth of two F. oxysporum f. sp. lycopersici (isolates 14 and 19), F. solani, V. dahliae and R. solani were evaluated under laboratory conditions in Petri dishes or in liquid culture. The incubation conditions of 25°C and improved aeration (obtained by not wrapping the culture plates) induced the optimal growth of all fungi tested. Among the culture media tested, potato dextrose agar (PDA) was the best medium for the growth of all fungi tested except for F. oxysporum f. sp. lycopersici (isolate 14) which grew best on lima bean agar. The continuous light induced the best growth for F. oxysporum f. sp. lycopersici (isolate 19), F. solani and R. solani. However, F. oxysporum f. sp. lycopersici (isolate 14) grew best under continuous darkness while diurnal light was the best for V. dahliae growth. In general, pH 8 (initial level) promoted the best growth of all fungi tested (isolate 19 of F. oxysporum f. sp. lycopersici, F. solani, V. dahliae and R. solani) except for F. oxysporum f. sp. lycopersici (isolate 14) which was best grown at pH 9 (initial level).

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