Vol 11, No 1, January 2020.

Pathogenic and/or Saprophytic Fungi of Wilted Peanut Seedling and Their Role in Pathogenicity of Peanut Seeds


The gross fungal counts of peanut seedling (20 samples) on glucose- (264 colonies) was higher than on cellulose- (214 colonies) Czapek,s agar. The average number of fungal colonies per sample was higher on glucose (5-23 colonies) compared with cellulose (4-17 colonies) medium with 93% and 84.5% infected seedlings by pathogenic and/or saprophytic fungi listed on the two isolation media, respectively. A total of 11 species of 6 genera were isolated and identified from the wilted seedling samples on glucose- and cellulose- (6 & 10 species of 4 & 6 genera, respectively) Czapek, s agar at 18 ± 1 0C. Three genera (Aspergillus, Fusarium and Gibberella) had the highest counts on glucose (52.2%, 29.2% & 10.2% of gross fungal count, respectively) and cellulose (59.8%, 18.6% & 6%, respectively) media and frequencies (50-100% and 30-95% of the samples, respectively). A. flavus had the highest counts and frequencies followed by F. oxysporum and G. fujikuroi. Two species (A. niger and Penicillium funiculosum) of two genera were detected on the two media in less counts (collectively, 13.6% and 9.8%) and frequencies (25-30%, respectively). Six species of 4 genera were isolated and identified on only one medium, where P. chrysogenum appeared only on glucose whereas, A. fumigatus, A. terreus, P. coryophilum, Nectria haematococca and Emericella nidulans were only detected on cellulose medium in low counts (collectively, 22.9% of fungal count). The most dominant species (A. flavus, F. oxysporum and G. fujikuroi) were tested for their pathogenicity against peanut seed (healthy and surface disinfected) germination on three soil types (sandy, loam and clay). G. fujikyroi and F. oxysporum were highly pathogens on germination of peanut seeds (average: 28.6% and 34.6%, respectively) whereas, A. flavus was poorly effect (72% seed germination) compared with control (73.6%). Also, sandy soil had the best in rate of germination compared with loam and clay soils. It is worthy to mention that, the germination of peanut seeds in treated seeds with the spore suspensions of the most dominant isolates tested consumed time compared with untreated (control) seeds.