Infection and colonization of leaves often lead to petiole lesions, which constrict the vascular system in compound leaves thus leading to decreased transport of photosynthates.The mycelium spreads from the petiole to the main stem and causes stem lesions at sites of previous injury from fallen leaves or from insect damage, in particular, from corn stem borers. Girdling is the most common result of stem lesions, but under hot conditions complete stem rot may occur in the presence of secondary bacteria. Dry rot symptoms similar to those caused by Fusarium spp. may be seen on tubers in storage when inoculum levels are high