Web blight, a new disease of Sechium edule.

Symptoms of a new disease of christophine (Sechium edule) were observed in Trinidad in 1991. The disease caused extensive leaf blight and webbing together of leaves, both of which were associated with the presence of numerous microsclerotia on dried leaves and petioles. This disease, called web blight, was shown to be caused by Thanatephorus cucumeris (anamorph Rhizoctonia solani). This is the first report of this disease on christophine.