Variability in Fusarium oxysporum f.sp. ciceri
2005
Iqbal, S.M.,National Agricultural Research Centre, Islamabad (Pakistan). PulsesProgramme
Twelve isolates of Fusarium oxysporum f. sp. ciceri derived from single sporecultures, representing chickpea (Cicer arietinum L.) production sites of Pakistanwere studied for their morphological characters and pathogenic variability. Theisolates exhibited variation in morphological and cultural characteristics. IsolatesFW-5 and FW-10 with a colony diameter of 7.57 and 8.9 cm were considered thefast growing whereas isolates FW-1, W-4, FW-7 and FW-11 (radial growth rangefrom 4.6 to 5.8 cm) as the slow growing. Reaction of 10 chickpea genotypes to 12isolates of F. oxysporum indicated that cultivars, Punjab-91 and C-235 wereresistant to most of the isolates but gave tolerant response to isolates FW-4 andFW-10 while they exhibited variable susceptible reaction to other isolates.Cultivars AUG 424 and ILC 1929 showed susceptible response to all the isolatestested. The remaining cultivars showed considerable variation in disease response.Isolates also varied in their pathogenic variation to the cultivar tested. The mostvirulent isolates were FW- 6, FW-3 and FW-4. Variability among the isolates of F.oxysporum was also determined on the basis of sensitivity of isolates tofungicides. A significant variability in this regard was observed. Benlate wasfound to be the most effective fungicide in suppressing the growth of all theisolates tested followed by ridomil and sancozeb.
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