21 



and on the whole the disease is not serious in this locahty. It 

 is reported as being rather serious in New Jersey, Ohio and the 

 South, and it lias recently caused much trouble in the Middle 

 West. 



This disease is distinguished from other leaf diseases by the 

 presence of circular spots, at first appearing on the lower leaves. 

 The infection increases with the development of the plant, and 

 in severe cases little remains of the plant but bare stems and 

 small, stunted fruit. 1>. D. Halsted.^ who was the first to call 

 attention to this fungus, and who has had considerable oppor- 

 tunity to experiment wath it, finds that it yields to treatment 

 with the Bordeaux mixture. The first spraying should be given 

 about two weeks after transplanting, followed by two or three 

 additional sprayings at intervals of three weeks. 



J. W. Lloyd, and I. S. Brooks^ have demonstrated that re- 

 peated spraying of tomatoes reduces leaf blight materially and 

 greatly increases the yield of fruit. 



LEAF MOLD 



(Alternaria Colani (E. & M.), Jones & Grout.) 



The fungus causing leaf mold is the same as that giving rise 

 to the early blight of potatoes. It often occurs on the leaves 

 and fruit of field crops, but we have never observed it on green- 

 house plants. The leaves aiTected with this fungus present at 

 first minute spots, which gradually enlarge and become marked 

 with concentric lines. These spots are sometimes associated 

 with the injuries caused by the flea beetle. 



The remedy advocated is similar to those that are applied 

 for the early blight of potatoes, namely, spraymg with some 

 good fungicide. 



BLIGHT 



(Bacillus Solanacearum, Smith.) 



This disease has not been observed in this State up to the 

 present time, but has caused considerable injury farther South. 

 E. F. Smith^ has fully described the disease and recommended 

 as precautions against it an early and complete destruction of 

 insect pests, and the removal of any diseased vines. He also 



1. X. J. Agr. Exp. Sta., Ann. Rept., 180.5, p. 294. 



2. 111. Agr. Exp. Sta., Bui. Xo. 144, 1910, p. 78—82. 



3. U. S. Rept. Agr., Div. Veg. Path, and Phys., Bui. Xo. 12, 1896. 



