PLANT NEMATODES THE GROWER SHOULD KNOW


the nematode larvae did not have the ability to induce the invaded host
to produce their food. Further studies on so-called resistant plants
showed a similar situation to exist, e.g. in Crotalaria spectabilis Roth,
Solanum grandiflorum R. & P., lantana (Lantana camera L.), "dusty
miller" or silver cineraria (Senecio cineraria DC.), Nicotiana megalo-
siphon Huerck & Muell. Arg. and Nicotiana plumbaginifolia Viv. Cro-


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 Figure 9.-Lespedeza stipulacea Maxim., Korean clover, showing nodules caused
by root-knot nematodes (solid arrows), and nodules caused by beneficial nitrogen-
fixing bacteria (open arrows). Coll: Virginia, 1941; % normal size. It may be
mentioned that this lespedeza is an excellent indicator plant to detect the presence
of root-knot nematodes in the soil. Where these nematodes occur in a soil growing
this species, the plants always will be stunted and yellow.