INHERITANCE OF RESISTANCE TO ROOT-LESION NEMATODE IN RED RASPBERRY

The inheritance of resistance to the root lesion nematode [Pratylenchu s penetrans (Cobb) Filip. and Stek.] in red raspberry (Rubus idaeus L. ) was studied in a four-member half diallel, involving two resistant g enotypes and two susceptible genotypes. Estimates of general and speci fic combining abilities (GCA and SCA, respectively) were determined fo r nematode densities in roots alone and soil alone, nematode densities per plant, and plant root and foliage biomass. GCA were significant f or nematodes in soil and for root and foliage biomass; SCA were signif icant for nematodes in the soil and for root biomass. Neither GCA nor SCA was significant for number of nematodes in the roots or per plant.