Pratylenchus Damage Levels for Oregon Crops: A Literature Survey
DRAFT: January 1998
Introduction
Root-lesion nematodes (Pratylenchus spp.) create holes in root cells and crawl inside. They move longitudinally through the cortex, piercing, sucking, and leaving behind a trail of cell-killing metabolites and eggs. Eggs deposited in both roots and soil hatch, and the life cycle continues through four molts to sexual maturity and reproduction. Root cell death results in brown longitudinal root lesions, which begin on one side but may eventually encircle a root and thereby girdle it. The overall effect is a weak, shallow root system with extensive dead areas. Pratylenchus spp. are disseminated by transportation of soil or plant parts and by surface or irrigation water (Evans et al. 1993). Pratylenchus species included in this survey are limited to those detected on Oregon agricultural crops: P. crenatus, P. neglectus, P. penetrans, and P. thornei.
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