. Fig. 8. Nematode Root Knot. a. Root knot of Irish potato, b. root knot of onion, c. root knot of parsnip, d. egg'of nematode, Helerodera radicicola, e. young female worm, /. half-grown female worm g. young male worm, h. matured male worm ready to emerge from old body covering, ;. matured female worm (d. to i. greatly enlarged, after Stone and Smith).

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