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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #113297
Title: RESISTANCE IN SELECTED CORN HYBRIDS TO MELOIDOGYNE ARENARIA AND M. INCOGNITA.

Author
item DAVIS, R - UNIVERSITY OF GEORGIA
item Timper, Patricia - Patty

Submitted to: Journal of Nematology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/20/2000
Publication Date: 12/1/2000
Citation: Davis, R.F., Timper, P. 2000. Resistance in selected corn hybrids to Meloidogyne arenaria and M. incognita. Supplement to Journal of Nematology. 32:633-640.

Interpretive Summary: A total of 33 corn hybrids were evaluated in a series of greenhouse and field trials to determine if they differed in resistance to either the southern root-knot nematode or the peanut root-knot nematode. The relative reproduction of these two nematodes on corn was also compared. Some corn hybrids supported less reproduction of the peanut root-knot nematode in greenhouse experiments and were designated resistant; however reproduction was similar among hybrids in the field experiment. No hybrids were consistently resistant to the southern root-knot nematode. The southern root-knot nematode reproduced to a much greater extent than the peanut root-knot nematode on corn. A survey of 102 corn fields from 11 counties throughout southern Georgia was conducted to determine the relative frequency of the southern and peanut root-knot nematodes. Root-knot species were found in 34 of the fields surveyed and 93.9% of these were identified as the southern root-knot nematode. The frequency of this nematode was 99.6% if the previous crop was cotton and 84.6% if the previous crop was peanut. In locations where potentially damaging populations of root-knot nematodes are present, corn hybrids may be a more suitable rotation crop for managing the peanut root-knot nematode in peanut than for managing the southern root-knot nematode in cotton.

Technical Abstract: A total of 33 corn hybrids were evaluated in a series of greenhouse and field trials to determine if they differed in resistance to either M. incognita race 3 or M. arenaria race 1. Reproduction of M. incognita race 3 and M. arenaria race 1 on the hybrids was also compared. Reproduction of M. arenaria differed among corn hybrids after 58-65 days in greenhouse experiments; however reproduction was similar among hybrids in the field experiment. No hybrids were consistently resistant to M. incognita. Two isolates of M. arenaria and two of M. incognita were evaluated in the greenhouse trials and no evidence of isolate-dependent resistance was observed. Meloidogyne incognita reproduced to a much greater extent than M. arenaria on the hybrids in this study. A survey of 102 corn fields from 11 counties throughout southern Georgia was conducted to determine the relative frequency of M. incognita and M. arenaria. Meloidogyne species were found in 34 of the fields surveyed and 93.9% of these were identified as M. incognita. The frequency of M. incognita was 99.6% if the previous crop was cotton and 84.6% if the previous crop was peanut. Pratylenchus sp. were extracted from all intact corn root systems examined.