
PEATE NX VL. — Two. Root TrRouBLEs or ALFALFA, 
I, Root-knot caused by nematodes; 2, pitting of the tap-root; 3, portion of tap-root 
and lateral root with a root-knot; 4, a root-knot showing gravid female nematode 
_at a; 5, mematode egg; 6, young nematode. 
(1 and 2 natural size; 3 and 4, magnified 2 diameters; 5 and 6, magnified 95 dia- 
meters. ) 
