Disease guide

Foliar symptoms begin as yellowing and wilting of the younger leaves in the upper portions of the plant. As the disease progresses, dark brown to black lesions form on the stems and the entire plant may wilt or die if infection is severe. A longitudinal section of the affected stems may reveal a dark brown discoloration of the pith and vascular system. Also. the stem may contain hollow or segmented cavities. Profuse adventitious root development can occur along the stem where the pith is affected.

The disease has been associated with cool night temperatures, high humidity and excessive nitrogen fertilization. The onset of symptoms often occurs when the fruit reach the mature green stage, especially if the plants are too succulent.

Avoid excessive applications of nitrogen fertilizers and other practices that could contribute to increased plant succulence. The disease can be spread by pruning and mechanical wounding so these practices should be avoided as much as possible, especially when the foliage is wet. Disinfecting pruning implements can help reduce the rate of spread of the disease.