1990 Volume 56 Issue 2 Pages 185-193
An orange mutant of Fusarium oxysporum (Schlecht.) emend. Snyd. et Hans. f. sp. cucumerinum Owen CH11200 (Foc) was obtained by ultraviolet irradiation. Pathogenicity, morphological features and some other properties of this mutant (T107) and its 15 single spore isolates relating to their survival in soil were compared with those of Foc. Microconidia of T107 were formed on the phialide. Productivity of microconidia of T107 and its 15 isolates on PSA was almost the same as that of Foc. The effect of temperature on growth of both Foc and T107 seemed to be similar. T107 survived in soil as chlamydospore and caused wilt of cucumber seedlings. It was proved that T107 had the same morphological and biological features and behaviors in soil as Foc. This orange mutant is considered to be suitable for ecological study on Fusarium oxysporum f. sp. cucumerinum.