Relative Resistance of Red Raspberry and Related Genotypes to the Root Lesion Nematode

Twenty-one genotypes of red raspberry (Rubus idaeus L.) and related Rubus species were screened for reaction to the root lesion nematode [Pratylenchus penetrans (Cobb) Fillip and Skek.] in greenhouse pot trials; 6 of the genotypes were also screened in a microplot trial in the field. There were significant differences in numbers of nematodes recovered among the genotypes in the greenhouse trials but not in the microplot trial. Among the most resistant genotypes were a seedling of the North American red raspberry (Rubus idaeus strigosus Michx.) and a seedling of an eastern Asiatic species (R. crataegifolius Bge). ‘Nootka’ was the most resistant of the cultivars screened and ‘Glen Clova’ and ‘Chilcotin’ were the most susceptible. There were no significant effects from nematode inoculations on the observed growth parameters of the genotypes in any of the trials.