If the fungus has not progressed too far, control can also be achieved with the use of fungicide drenches applied as soon as symptoms are visible. Among the compounds registered for use in Connecticut are etridiazole, metalaxyl, and thiophanate-methyl. Consult the label for dosage rates, safety precautions, and indoor use. Other biological compounds formulated with Trichoderma spp. Black root rot, Thielaviopsis basicola.
Infected plants are slow growing with small leaves showing bronzed areas between the veins.
Leaves eventually drop. Bracts develop irregularly. The fungus enters the plant from the soil through the roots or may be carried in the cuttings. Healthy cuttings stuck in sterilized media and potted in sterilized soil and pots will not contract the disease. Among the compounds registered for use in Connecticut are benomyl and thiophanate-methyl.