Indiana Plant Diseases. 205 
Hyidence of the spread of mosaic by cultural practices in greenhouses 
was afforded in a canning crop near Hammond, the plants for which were 
grown in a greenhouse and trimmed back with a shears. One mosaic plant 
was found among the plants in the greenhouse and in the field crop grown 
from these plants mosaic was epidemic. In a greenhouse crop at Lafayette 
the spread of mosaic was very evidently associated with the use of the prun- 
ing knife. 
Early blight caused by Alternaria solani was rather conspicuous in one 
greenhouse near Indianapolis, causing large target-board lesions on the 
leaves. The disease occurred in the Paoli region but was not very preva- 
lent in central Indiana. 
Leaf mold (Cladosporium fulvum) was severe in many greenhouses. 
Anthracnose caused by Colletotrichum phomoides (Fig. 11) was espe- 
cially prevalent this year late in September. In fields at Lafayette, a con- 
siderable percentage of the ripe tomatoes showed anthracnose lesions. 
Bacterial spot caused by Bacterium exritiosum (Fig. 12) was rather gen- 
eral in the canning crop and was noted on seedlings in Georgia being 
grown for shipment to Indiana growers. It was also noted in plant beds 
in Indiana by H. D. Brown. Its attack on the foliage of plants in the 
field is not noticeably destructive but serves as a source of fruit infection 
which probably takes place through wounds made by insects. The black, 
scabby fruit lesions are very objectionable from the canner's point of view. 
The disease is carried over winter with the seed and seed disinfection in 
corrosive sublimate 1 to 3,000 for 5 minutes has bean recommended as a 
control measure. 
Fig. 12. Tomato bacterial spot. 
