88 SEVENTEENTH REPORT. 



figures available. The growers are beginning to realize that it is 

 uncertain whether they can much longer grow pickles at a profit 

 and are slow to contract for more acreage. This failing off is 

 watched with anxiety by the companies having stations in the 

 district since if it continues they will be obliged to change their 

 locations and the expense of such a step would be a large loss to 

 them and to the growers. 



HISTORY. 



The disease was first found in this country at the Geneva Ex- 

 periment Station, in 1887-, when it was noted by J. C. Arthur, 

 who described it as probably being a Cladosporium. 



It was first studied by him also, at the Indiana Experiment Sta- 

 tion in cooperation with J. B. Ellis of New Jersey, in 1889^. The 

 disease was ver^: severe in that year and investigation proved it 

 to be due to a new species of Cladosporium, which they named 

 Cladosporki m cucu merinum. 



Arthur describes the disease as appearing first as a sunken spot 

 ■with a velvety surface, from which there may be a gummy exuda- 

 tion, giving the appearance of au insect injury. As the disease 

 progresses a small cavity is formed beneath the fungus-covered 

 surface. He states that this is due to the action of the mycelium 

 which dissolves the cell walls, thus causing the exudate of gum on 

 which the fungiis subsists. 



No other Avork was done except the description of the main symj)- 

 loms and characters, control measures not being discussed. 



Frank found the disease in a garden near Berlin in 1892*. and, 

 his description is practically identical with that of the fungus 

 found by Arthur. Not having heard of Arthur's work he called it 

 Cladosporiu m cii on in erls. 



He stated that it was quite prevalent in Germany at that time 

 and noted that the growers were using Bordeaux mixture to com- 

 bat it, with very little result. This fact led him to cxj)eriment 

 with the effect of Bordeaux mixture on the spores of the fungus. 



A portion of the infected material was taken and immersed in 

 a 2% Bordeaux for two hours, taking care that the spores were 

 actually in contact with the fungicide. After this period they were 

 washed thoroughly and their power of germination tested. He 

 found that the copper api)arently was not fungicidal in its action 

 toward the spores as they germinated readily. However, no work 

 was done beyond this one experiment. 



2. 6th. N. Y. Apri. Exp. Sta. Report. 1RS8. p. 316. 



3. Bull. 19. Indiana Agr. Exp. Sta. 1889. p. 8. 



4. Frank. A. U. Zcit.slu- f. Pflanzonkr. Ill p. 30, 1893. 



