Pathogenic Effects of Pratylenchus scribneri in Maize Inbreds and Related Cultivars. S. W. Waudo, Department of Plant Pathology, Seed and Weed Science, Iowa State University 50011. D. C. Norton, Department of Plant Pathology, Seed and Weed Science, Iowa State University 50011. Plant Dis. 70:636-638. Accepted for publication 29 January 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-636.

Maize inbreds C123Ht, C103, and Mo17Ht inoculated with 8,500 ± 500 Pratylenchus scribneri developed dark brown, discrete lesions on their roots and had reduced root size and weight and extensively pruned root systems 90 days after inoculation in the greenhouse. Inbred B68Ht, similarly treated, had the fewest nematodes and no visible pathological symptoms. In the field, the nematode significantly (P = 0.05) reduced either weight, size, volume, or number and/or angle of fibrous roots of some inbreds and hybrids. Inbred C123Ht and its related cultivars C103, Mo17Ht, C123Ht × Mo17Ht, and C123Ht × C103 supported some of the largest numbers of P. scribneri both in the greenhouse and the field. In most instances, B37Ht and B68Ht had the fewest P. scribneri.