Surrounding tissue is discolored and yellowed, and plants are often stunted. Control of heteroecious rusts may be aided by removal of the alternate host, but for most perennials, control may also be achieved with the use of fungicides applied as soon as symptoms are visible. Among the compounds registered for use in Connecticut are sulfur and mancozeb. Consult the label for dosage rates, safety precautions, and directions for use. Wilt, Verticillium albo-atrum.
Plants are slow growing and small.
Lower leaves yellow, and plants wilt and die. Black streaking in vascular bundles of stem indicate infection by one of these fungi. Planting in uninfested soil will prevent this disease. Once present in a garden other susceptible species may contract the disease if put in the same location. Use of clean soil is indicated.