Bacterial wilt symptoms are young plants wilting 1-2 leaves during the heat of the day. Such plants tend to recover at night. On large-leafed plants, only the tissue on one side of the mid-vein may wilt. Affected leaves turn yellow and remain wilted after a time. The area between the leaf veins dies and browns. Usually, the main stem of the affected plants remains upright even though all the leaves may wilt and die. Internal symptoms include light tan to yellow-brown discoloration of the vascular tissue. Long sections of infected stems reveal dark brown to black streaking in the vascular tissue as the disease progresses. As invasion proceeds, the pith and cortex of the stem become dark brown.