Arnet, J.D.; Bertrand, P.; Crawford, J.; Ellis, HC; Lambert, W.; McGlohon, N.; Suber, F.; Thompson, S.; Womack, H.; Brown, E.A.; Evans, B.R. Insect and Disease Identification Guide for IPM in the Southeast. The University of Georgia. Cooperative Extension Service Bulletin 849. September 1981. 59p.
White Mold (fungus Sclerotium rolfsii)
White mold results in a brown dry rot of the lower stem and crown and one or more branches wilt and die. Up to 10 to 12 adjacent plants may wilt and show signs of the disease. The stems of diseased plants and often the ground and lower leaves are covered with a dense, white fungus growth. Small, brown fungus fruiting bodies similar to mustard seed usually form on dead stems and leaves.
Peanut Leaf Spots (fungi, early leaf spot, Cercospora arachidicola; late leaf spot, Cercosporidiuum personatum)
The first symptoms of both diseases are small, pale yellow or blanched spots. These soon enlarge and become tan to black. The color of the spot on the lower leaf surface can often be used to distinguish between early and late leaf spots. Early leaf spot is brown and late leaf spot is black.
Pod Rots (fungi Rhizoctonia solani, Pythium myriotylum, Fusarium solani and occasionally other fungi)
Pods show varying degrees of discoloration, from slight superficial brown and black spots to complete pod discoloration. Partial or complete rotting of pods and kernels may occur. This may be a dry rot to a mushy, wet rot. Pods are often left in the ground at digging.
Nematodes (root-knot Meloidogyne arenaria, Meloidogyne hapla)
Above-ground symptoms are yellowing, wilting and stunting of plants in areas from a few feet in diameter to several acres. Roots usually have knots and galls that vary in size from slight swelling to large galls 3 or 4 times the size of the root. Pegs and pods are usually distorted with galls.
