THE MULBERRY BLIGHT.' TYPE 



341 



outright by this disease (except sometimes nursery stock), but 

 the trees often become ragged, stunted, and unprofitable. As 

 in fire-blight on the apple, the crown of the tree may be spotted 

 all over with conspicuous dead twigs bearing brown leaves. 





FIG. 262. A mulberry shoot 9 days after inoculation with Bacterium mori. 

 Shows dark sunken places on the stem (where pricked); younger leaves shriveling; 

 older leaves spotted and distorted. Dept. of Agric. hothouse, Jan. 13, 1909. 



The disease prevails on various kinds of mulberry, including 

 the Russian. It cannot be produced by inoculating with the 

 pear-blight organism. 



Its exact geographical distribution is not known. It occurs 

 in various parts of the United States (East, South, and West), 



