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 B..








 Figure 21.-The kidney-shaped nematode, Rotylenchulus reniformis Linford. A.
Pieces of roots of Jacquemontia tamnifolia L. Griseb with specimens of the kidney-
shaped nematode attached to them. Their body is covered with small soil particles
which are held together by a glabrous secretion produced by the nematode. Thus,
the uninformed will never suspect that the small globular bodies attached to these
roots are not parts of soil but hide a sedentary root-parasitic nematode. x 24. Sam-
ple collected by A. L. Smith at Cuthbert, Ga. B. Tomato root infected with the
kidney-shaped nematode; the glabrous cover surrounding the nematodes has been
teased off to expose their bodies; their elongated neck, with which they penetrate
the root, may be seen. Tomato plant experimentally infected in a greenhouse. x 170.