Penetration of Celery and Alfalfa Roots by Pratylenchus penetrans as Affected by Temperature
Abstract
A greater percentage of females than juveniles or males of P. penetrans penetrated celery roots grown in infested soil at 5, 18, or 30 C; the difference was greatest at 5 C. The time of initial penetration of alfalfa seedlings inoculated with single nematodes on water agar varied with temperature. Females penetrated the seedlings earlier and over a wider range of temperatures than did males or juveniles. The rate of penetration was highest for females. After initial penetration, the penetration rate decreased with time. At 13-28 C, approximately 80% of roots were penetrated by females and only 25-30% by males and juveniles by the end of the experiment. Key words: alfalfa, Apium graveolens, celery, Medicago sativum, root penetration, Pratylenchus penetrans, lesion nematode.Downloads
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