Reproduction of Meloidogyne javanica on Corn Hybrids and Inbreds

The reproductive potential of a Meloidogyne javanica population on 64 commercial corn hybrids and 33 corn inbred lines was determined in greenhouse experiments. Reproduction was measured by determining RF values (final egg number per initial egg number) and number of eggs per gram of fresh root. All corn hybrids supported reproduction greater than RF = 1.0. RF values for the hybrids ranged from 1.1 for 'Pioneer 3147' to 15.5 for 'Coker 8575'. Three inbreds -- MpT03, NC246, and Mp307 -- maintained M. javanica below the initial population level, with RF values of 0.7, 0.7, and 0.8, respectively. Three other inbreds -- F6, Mp704, and T220 -- maintained M. javanica at RF = 1.0. RF values of the other 27 inbreds ranged from 1.2 for Mp313 to 9.5 for B37.