|Davis, Richard - UNIVERSITY OF GEORGIA|
Submitted to: Journal of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: July 4, 1999
Publication Date: December 1, 1999
Citation: Davis, R.F., Timper, P. 1999. Resistance to Meloidogyne incognita and M. arenaria in corn hybrids [abstract]. Journal of Nematology. 31(4):529-530. Technical Abstract: Corn (Zea mays) is commonly grown in rotation with cotton and peanut for suppression of soilborne pathogens, including Meloidogyne species. Resistance to M. incognita race 3 and M. arenaria race 1 in 24 corn hybrids was evaluated in separate greenhouse experiments with six replications per test. The corn hybrids were chosen because they are grown on over 90% of the corn acreage in Georgia. Two isolates each of M. incognita and M. arenaria were tested in two experimental trials per isolate. Pots (15-cm-diam.) were inoculated with 8,000 eggs approximately 7-10 days after corn emergence. Nematode eggs were extracted and counted approximately 56 days after inoculation. Reproduction of M. incognita was similar in all hybrids regardless of nematode isolate with a mean of 252,154 eggs per pot. Reproduction of M. arenaria differed among hybrids with a mean of 2,142 eggs per pot for the eight most resistant hybrids and 15,537 for the eight most susceptible hybrids. Reproduction of M. arenaria was not affected by nematode isolate. It is likely that the most resistant hybrids could be useful in managing M. arenaria populations. Though tested in separate experiments, it appears that these corn hybrids allow significantly less M. arenaria than M. incognita reproduction.