A Diagnostic Guide for Fusarium Wilt of Watermelon

Fig. 2. Symptoms of Fusarium wilt in seedlings. (A) Post-emergance-damping-off can occur in watermelon seedlings exposed to Fusarium oxysporum f.sp. niveum (FON) in the greenhouse.



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