conspectus: prevalence and distribution 53 



Japan. — The tobacco wilt, which has destroyed many fields, 

 is probably the worst Japanese disease. This is believed by Hon- 

 ing and by the writer to be identical with the tobacco wilt of 

 Sumatra and of the United States. The citrus canker occurs 

 and several other interesting bacterial blights have been re- 

 ported from Japan, including one on the basket willow (Fig. 37). 



Fig. 37. — Agar poured plate colony of the schizomycete causing the Japanese 

 basket-willow disease. Photographed by oblique transmitted light to show inter- 

 nal structure. X 10. 



China. — In the interior of China there is a destructive wilt 

 disease of tobacco (Frank N. Meyer), but its nature is unknown. 

 A Fusarium cultivated from it in my laboratory did not cause 

 the wilt when I inoculated it copiously into the soil near broken 

 roots of young tobaccos nor yet when I introduced it into deep 

 wounds made in the stems of young vigorous plants at the sur- 

 face of the earth. 



