A Diagnostic Guide for Fusarium Wilt of Watermelon

Fig. 3. Isolation and growth of Fusarium oxysporum f.sp. niveum (FON) from symptomatic stems. (B) FON morphology varies with isolate and isolateion media. Here different FON race-1 isolates have grown for 10 days on Komada’s medium (upper row) and PDA (lower row).



Image from Plant Health Progress article:
A Diagnostic Guide for Fusarium Wilt of Watermelon