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Resistance of two sets of bell pepper [(Capsicum annuum L. var. annuum (Grossum Group)] cultivars near-isogenic for the N gene that conditions resistance to root-knot nematodes [Meloidogyne incognita (Chitwood) Kofoid and White, M. arenaria (Neal) Chitwood races 1 and 2, and M. javanica (Treub) Chitwood] was evaluated in field tests at Blackville, S.C. and Charleston, S.C. The isogenic bell pepper sets were 'Charleston Belle' (NN) and 'Keystone Resistant Giant' (nn), and 'Carolina Wonder' (NN) and 'Yolo Wonder B' (nn). The resistant cultivars Charleston Belle and Carolina Wonder were highly resistant; root galling was minimal for both cultivars at both test sites. The susceptible cultivars Keystone Resistant Giant and Yolo Wonder B were highly susceptible; root galling was severe at both test sites. 'Charleston Belle' had 96.9% fewer eggs per g fresh root than 'Keystone Resistant Giant', and 'Carolina Wonder'had 98.3% fewer eggs per g fresh root than 'Yolo Wonder B' (averaged over both test sites). 'Charleston Belle' and 'Carolina Wonder' exhibited a high level of resistance in field studies at both sites. These results demonstrate that resistance conferred by the N gene for root-knot nematode resistance is effective in field-planted bell pepper. Root-knot nematode resistant bell peppers should provide economical and environmentally compatible alternatives to methyl bromide and other nematicides for managing M. incognita.

Response of Bell Pepper Cultivars Near-isogenic for the N Gene to Meloidogyne incognita in Field Trials