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Extraction of Oat Straw, Flax, and Amended Soil to Detect Substances Toxic to the Root-Knot Nematode. Leander F. Johnson, Professor of Plant Pathology, Department of Agricultural Biology, The University of Tennessee Institute of Agriculture, Knoxville, Tennessee 37916. Phytopathology 64:1471-1473. DOI: 10.1094/Phyto-64-1471.

A substance toxic to eggs and larvae of the root-knot nematode was extracted from mature, dried oat straw and leaves and stem segments of flax. A toxin was extracted also, but in lower concns, from soil amended and incubated 10 wk with similar amounts of these organic materials. Oat-straw-amended soil contained more toxin than did flax-amended soil.