Fusarium wilt

Fusarium oxysporum, f. sp. niveum

Fusarium wilt causes wilting of the above ground tissue and general vine decline in watermelon. Typically, one side of the plant will exhibit more severe symptoms than the other, which is known as unilateral wilting. The fungus colonizes the vascular system causing discoloration that is visible if stems are cut open longitudinally. Fusarium wilt typically occurs in patches in the field. Infection occurs in the Spring when temperatures are cooler, but symptoms are seen in the summer when higher temperatures favor the wilt symptoms.


Factsheets

More information about Fusarium wilt


Figure 1. Wilting of the aboveground tissue. All leaves are wilted or necrotic. Image provided by Nathan Miller, NCSU Vegetable Pathology Lab.

fusarium symptoms

Figure 2. Brown streaking in the xylem tissue. Dr. Dan Egel, Purdue University.


disease symptoms in a field

Figure 3. Fusarium wilt is a patchy disease and healthy plants can be found in between diseased plants.

 

disease symptoms in a field

Figure 4. Unilateral wilting of single, green vines due to Fusarium wilt. Dr. Lina Quesada, NCSU Vegetable Pathology Lab