continued to be descriptive and taxonomic, focusing primarily on free-living nematodes and plant and animal parasites. During this period a number of productive researchers contributed to the field of nematology in the United States and abroad. Beginning with Needham and continuing to Cobb, nematologists compiled and continuously revised a broad descriptive morphological taxonomy of nematodes.

History: 1850 to the present

Kuhn (1874) is thought to be the first to use soil fumigation

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