Cultural and morphological variability among the isolates of fusarium solani (Mart.) sacc. inciting dry rot of potato (Solanum tuberosum L.) Tubers

Twenty five isolates of Fusarium solani (Mart.) Sacc., inciting dry rot of potato tubers were studied for its cultural and morphological variability. The isolates FS-14, FS-15 and FS-24 produced maximum mycelial growth (90.00 mm). The isolates produced different pigmentations viz., yellow, pale yellow, dark yellow, pink, orange, red, while the isolates FS-7 and FS-24 did not produced any pigmentation. The microconidia were round to oval shaped ranging from 6.0 μm ∼ 11.0 μm x 2.8 μm ∼ 3.6 μmin size with 0–1 septation. Macroconidia were sickle shaped to elongated with blunt end, ranging from 38.0 μm ∼ 47.4 μm x 4.5 μm ∼ 4.7 μm in size with 3–4 septations. The chlamydospores were globose to oval, terminal or intercalary with smooth or rough wall either formed singly or in chain.