charcoal rot of cucumber

Charcoal rot-The first symptom one is likely to observe of charcoal rot is the wilt of cucumber plants. Upon closer inspection, the affected plant has developed a light gray canker that encircles the stem. The canker may be dotted with myriad dark, microsclerotia. The causal fungus has a huge host range and prefers warm soils. This disease has not been common, but maybe become more so in soils under high tunnels.    

Figure 1. Charcoal rot of cucumber. Plant wilt is often the first symptom observed. Figure 1. Charcoal rot of cucumber. Plant wilt is often the first symptom observed.
Figure 2. Charcoal rot of cucumber. Plant wilt is visible and lesion on lower stem. Figure 2. Charcoal rot of cucumber. Plant wilt is visible and lesion on lower stem.
Figure 3. Charcoal rot of cucumber. Light gray lesion on stem with micro-sclerotia shown. Figure 3. Charcoal rot of cucumber. Light gray lesion on stem with micro-sclerotia shown.
Figure 4. Charcoal rot of cucumber. Figure 4. Charcoal rot of cucumber.