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, Heterodera radicicola, e. youn, 'izr'- . ^ •-»"-,Tmwn r^^ax^ 



worm, g. young male worm, h. matured male w«-6^Tn-i r^s^^^y ^^ ^11.^^^,^,^, , ,...,_:, _ ,. 

 covering, j, matured female worm (d. to ». great .-;:;!-.■.- r._. Ill - .•.. . 



