Fig. 4. Some natural enemies of nematodes commonly found in soil: (A) Arthrobotrys dactyloides, a nematode-trapping fungus, forming constricting rings to trap a root-knot nematode; (B) Harposporium anguillulae, a nematode-endoparasitic fungus, colonizing a bacterivorous nematode; (C) Mononchus sp., a predatory nematode.

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