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The Biology and Pathogenicity of the Awl Nematode, Dolichodorus Heterocefhalus

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For more content, see Nematology.

Dolichodorus heterocephalus multiplied on corn, garden balsam, tomato, cabbage and bean in the greenhouse. In pot tests, dry root weights of corn and garden balsam were reduced significantly. Individual nematodes fed at one location on tomato roots for up to 7 days. In monoxenic culture, discrete lesions and galls formed on parasitized roots. Prolonged feeding resulted in inhibition of normal root growth. Histological examination revealed that cortical cell nuclei were enlarged. Groups of brownish, discolored cells occurred in localized areas of the cortex and endodermis. Differentiated vascular tissues were nearer to the root tip in parasitized roots as compared to nonparasitized roots. Hyperplasia and hypertrophy occurred within root galls. The life stages were differentiated and described. Females that possessed bluntly rounded tails were proved to be morphologic variants of D. heterocephalus.

Affiliations: 1: Laboratory of Experimental Biology, University of Massachusetts, East Wareham, Massachusetts, U.S.A


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