134 



FUNGOUS DISEASES OF PLANTS 



XIV. WILT OF SOLANACE/E 

 Bacillus solanacearum Erw. Smith 



Smith, Erw. F. A Bacterial Disease of the Tomato, Egg Plant and Irish 

 Potato. U. S. Dept. Agl., Div. Veg. Phys. and Path. Built. 12: 1-26. 

 pis. 1-2. 1896. 



Smith, Erw. F. The Granville Tobacco Wilt. U. S. Dept. Agl., Bureau 

 Plant Industry, Built. 141 (Pt. II): 17-24. 1908. 



This is a germ which, in the United States, causes an important 

 wilt and drying up of potatoes, tomatoes, and eggplants. In the 



far South it is particularly destruc- 

 tive to tomatoes. It has also been 

 found in Europe and Asia. When 

 potato vines are affected there is a 

 blackening of the fibrovascular sys- 

 tem of the tuber, and eventually a 

 black rot may set in. The organism 

 is aerobic and an alkaline reaction 

 is produced. No gas is evolved, 

 and gelatin is not, or only very 

 slightly, liquefied. Recently it has 

 been found that this organism pro- 

 duces also the Granville tobacco wilt. 



Fig. 40. Subculture of Bacillus 

 aroidea* on Agar Slant. (Photo- 

 graph by C. O. Townsend) 



XV. BACILLUS: OTHER SPECIES 



Among other disease-producing organisms of this genus may 

 be mentioned the following : 



Bacillus Hyacinthi-septiciis Heinz, 1 causing rapid death of cul- 

 tivated hyacinths. 



Bacillus Cubonianus Macch., 2 said to be the cause of an 

 important leaf and twig disease of the mulberry, especially in 

 France and Italy. 



1 Heinz, A. Zur Kenntniss der Rotzkrankheiten der Pflanzen. Centrbl. f. 

 Bakt. u. Parasitenk. 5 : 535-539. 1889. 



2 Macchiati, L. Sulla biologia del Bacillus Cubonianus, sp. nov. Malpighia 5 : 

 289-301. pi. 2i. 1891. 



