Gall Formation on Cirsium arvense by Ditylenchus dipsaci

A. K. Watson, J. D. Shorthouse

Abstract


Ditylenchus dipsaci was found to cause gall formation on the stems of Cirsium atvense. The galls were characterized by extensive hypertrophy and hyperplasia, differentiation of nutritive tissue, nuclear modification, and a central cavity containing nematodes. These findings emphasize the importance of host response in investigations of host-parasite interactions and suggest that D. dipsaci may be evolving a host race by reproductive isolation within the confines of a plant gall. Key Words: host race, stem and bulb nematode, histopathology.

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