180 



FUNGI AND FUNGICIDES 



appears to be true of heavy dressings of stable manure. 

 The less improved varieties of tomatoes, like many of 

 the old angular sorts, and the cherry and plum varieties, 

 are almost exempt from attack." 



The Winter Blight 



Professor Bailey has described, under the name of 

 Winter Blight, a malady of greenhouse tomatoes that 

 sometimes proves disastrous to attempts to force this 

 fruit. It has the general appearance of a bacterial 

 blight, although no definite proof has yet been made 

 that it is caused by bacteria. When first attacked the 

 leaves become dwarfed and somewhat faded, with indis- 

 tinct yellowish spots on the surface. "The spots grow 

 larger, until they often become an eighth of an inch 

 across, or even more, and they are finally more or less 

 translucent. This injury to the foliage causes the plants 

 to dwindle, and the stems become small and hard. 

 Fruit production is lessened, or if the disease appears 

 before the flowers are formed, no fruit whatever may 

 set. In two or three instances in which young plants 

 were attacked, the disease killed the plant outright ; but 

 a diseased plant ordinarily lives throughout the winter, 

 a constant disappointment to its owner, but always 

 inspiring the vain hope that greater age or better care 

 may overcome the difficulty." This blight has not been 

 observed to attack the fruit. As stated above, it appears 

 to be due to bacteria a species of micrococcus but is 

 different from the tomato blight of the Southern States. 

 Various remedies have been tried without success, and 

 the best preventive measures are those of the immediate 

 destruction of all blighted plants, and the use of new 

 Boil in the greenhouse each fall. 



The Bacterial Tomato Blight 



Tomatoes in the Southern States are commonly 

 affected by a blight similar to, if not identical with, the 



