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Root-knot nematodes, especially the quarantine pests Meloidogyne chitwoodi and Meloidogyne fallax, are a threat to the seed potato production in The Netherlands. The two siblings are polyphagous and conventional control using crop rotation is almost impossible. Moreover, the use of nematicides is restricted as are not benign to the environment. Future management of these pests will therefore be based on crop rotations with non/poor and resistant hosts. The availability of these hosts is currently limited and the need to develop and evaluate resistant crops takes top priority. Dutch breeders were successful in introgressing resistant genes from wild Solanum spp. in to their cultivated potatoes. Moreover, Dutch and German breeders developed Melodigyne chitwoodi resistant fodder radish varieties using classical method of selection and cross breeding. In this thesis, the degree of resistance of these crops was evaluated using population dynamics models and a resistance of > 98% was obtained in both crops. Based on established population dynamics parameters a reliable and scientifically valid routine resistance test for potato breeders was developed and is now in use by Dutch breeders. This is expected to facilitate the breeding program towards a sustainable management of Meloidogyne chitwoodi. The performance of the resistant crops was also evaluated using relevant yield and quality loss models and a promising quality improvement of the resistant potato genotypes under higher initial population density was obtained as compared with susceptible cultivars. The results of the thesis will be included in the Dutch Decision Support System (DSS) NemaDecideGeo+available on the web-based smart farming platform, Akkerweb to help farmers, growers and extension agents in making decisions to control the nematode.

Quantitative studies on potato genotypes and fodder radish varieties resistant to the rootknot nematode Meloidogyne chitwoodi