Root-knot and its control . Stages in the Development of Heterodera Radicicola (Greef) Mull., etc. Bui. 217, Bureau of Plant Industry, U. S. Dept. of Agriculture. Plate II. Fig. 1.—Root-Knot on Sugar Beet. **^. ?-^ \ , \^^ Z^w3mSH3mB^ ^m k^^- ^ k Fig. 2.—Root-Knot on Squash. Bui. 2 1 7, Bureau of Plant Industry, U. S. Dept. of Agriculture. Plate 111 =

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