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Galls on onion roots caused by root knot nematode, ?Meloidogyne hapla.

Galls on onion roots caused by root knot nematode.; Salinas Valley, CA Credit: UC Davis Dept. of Plant Pathology — Galls on onion roots caused by root knot nematode, ?Meloidogyne hapla. Credit: UC Davis Dept. of Plant Pathology

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