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It is spread not only by grafting, but also by mechanical means and root-knot nematodes.
Some soils, especially the warm, sandy loams that peas do well in, are often infested with root-knot nematodes.
The research team discovered a comprehensive spectrum of parasitism genes in root-knot and cyst nematodes.
The targeted pests were chickweed, prickly lettuce, and root-knot nematode.
In U.S. cotton, the major species comprise root-knot , reniform, lance, and sting nematodes.
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