THE PATHOGENICITY OF <i>PRATYLENCHUS PENETRANS</i> TO CELERY

Abstract

Celery seedlings, grown aseptically in silica sand with plant nutrients, were inoculated with surface-sterilized specimens of the root lesion nematode Pratylenchus penetrans (Cobb, 1917) Filip. &amp; Stek., 1941. The reactions of invaded roots were studied microscopically. The epidermis, cortex, and endodermis of young celery roots showed different degrees of discoloration after invasion of P. penetrans, with the endodermis most severely affected. Pratylenchus penetrans was a primary parasite and pathogen of celery.