2011 Annual Report
1a.Objectives (from AD-416)
Identify effective rootstocks for managing Fusarium wilt and root-knot nematodes in grafted specialty melon production in the Southeastern U.S.
1b.Approach (from AD-416)
Commercial rootstocks, wild germplasm, and elite cultivars of bottle gourd (Lagenaria siceraria), hybrid squash (Cucumis moschata x C. maxima), winter melon (Benincasa hispida), Cucumis metulifer, Cucumis ficifolia, and cantaloupe (Cucumis melo) will be evaluated for resistances to Fusarium wilt (Fusarium oxysporum f. sp. melonis) and southern root-knot nematode (Meloidogyne incognita) and for graft compatibility with melon in greenhouse tests in SC. The five most resistant and graft-compatible genotypes will be evaluated as rootstocks for two desirable melon cultivars (scions) in fields infested with F. oxysporum f. sp. melonis and M. incognita in Charleston, SC. Vine vigor, incidence and severity of Fusarium wilt, and severity of root galling caused by root-knot nematode will be rated, and fruit yield will be recorded.
This research relates to inhouse objective 1: Develop improved resistance to root-knot nematodes in pepper and watermelon.
Root-knot nematode damage to melons is often severe in the southeastern U.S. Grafting melon on different cucurbit species (squash, bottle gourd, and others) is gaining acceptance among U.S. growers as a method for managing soil-borne diseases. If root-knot nematode resistant rootstocks were available, they could be used for managing root-knot nematodes in grafted melon. Twenty-three rootstocks were evaluated for response to southern root-knot nematode (Meloidogyne incognita) in replicated greenhouse tests and five rootstocks exhibited resistance to root-knot nematodes. These five rootstocks are being further evaluated in field tests for graft compatibility with speciality-type melons.