550 



BACTERIAL DISEASES OF PLANTS 



'^"f8^'fen>. 



Fig. 414. — A. Early stage of a nematode gall on a sugar beet root. In the 

 center the young worm is in place and near its head are two giant cells. Farther 

 away is the ordinary hyperplasia! tissue of the gall. B. Same as A but from 



