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Influence of Root Biomass on Number of Pratylenchus penetrans Within Host Roots. B. A. Jaffee, Graduate research assistant, Department of Plant Pathology, Cornell University, Ithaca, NY 14853; Phytopathology 70:1214-1216. Accepted for publication 9 June 1980. Copyright 1980 The American Phytopathological Society. DOI: 10.1094/Phyto-70-1214.

The influence of alfalfa root biomass on the number of Pratylenchus penetrans in alfalfa roots was examined. Differential root biomasses were obtained by planting different numbers of seeds in 120 cm3 of autoclaved loamy sand. Nematodes were either present in the soil at planting or were added to the soil surface 2 days later. A negative correlation existed between root biomass and the number of P. penetrans recovered per gram of root tissue. Knowledge of this phenomenon is of importance for the proper interpretation of population densities of endoparasitic nematodes in relation to predictive crop loss assessment.