A Diagnostic Guide for Fusarium Wilt of Watermelon

Fig. 3. Isolation and growth of Fusarium oxysporum f.sp. niveum (FON) from symptomatic stems. (A) FON emerging from a surface-sterilized stem from a symptomatic watermelon seedling.



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