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Histopathology of Corn Hybrids Infected with Root Knot Nematode, Meloidogyne incognita. J. G. Baldwin, Graduate Research Assistant, Department of Plant Pathology, North Carolina State University, Raleigh 27607; K. R. Barker, Associate Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27607. Phytopathology 60:1195-1198. Accepted for publication 13 March 1970. DOI: 10.1094/Phyto-60-1195.

Histopathological responses of corn (Zea mays) hybrid Coker 911 to Meloidogyne incognita were similar to those of other good hosts with respect to the development of granular, multinucleate giant cells and egg-laying females within 25 days after inoculation. In hybrid Pioneer 309B, a poor host, giant cells were often collapsed and associated with apparently dead larvae. No reproduction was evident in this host at 25 days after inoculation, but a few females with eggs were detected after 58 days. Higher numbers of larvae of M. incognita had penetrated Coker 911 at 4 and 8 days after inoculation than had penetrated the poor host, Pioneer 309B.