The Black-rot of the Grape, and its Control. 215 



II. THE CONTROL OF BLACK-ROT. 



Under the direction of Professor john craig. 



BY C. S. WILSON. 

 EXPERIMENTS OF I906. 



Three experiments were conducted by the Department of Horti- 

 culture under the direction of Professor Craig. The purpose of these 

 experiments was to study the effectiveness of different fungicides for 

 controlling the black-rot. They were conducted in the vineyards of the 

 Niagara Grape Company at Romulus, N. Y., which are under the super- 

 intendency of Mr. G. G. Lansing; in the vineyards of Mr. H. H. Bradley 

 King Ferry; and Mr. M. E. Sperry, Ludlowville. 



The vineyard of the Niagara Grape Company is situated about two 

 miles from the west side of Cayuga Lake. The land slopes slightly to the 

 east. The soil is a rich clay loam, and for several years the vineyard has 

 been well cultivated. The vines are about twenty years old, and had 

 been well sprayed previously. In 1905, black-rot destroyed the entire 

 crop. The variety is Niagara. 



Mr. Bradley's vineyard is situated on the east side of the lake at 

 King Ferry. The land slopes sharply to the west. The soil is a sandy 

 or gravelly loam, and has been well cultivated. The vines are nineteen 

 years old. Since the black-rot has not yet seriously affected the vine- 

 yard, it has been sprayed for two or three years only. In 1905, portions 

 only and not the whole vineyard were affected. In the experimental 

 plat the variety is Catawba. 



Mr. Sperry's vineyard is on the east side of the lake at Ludlowville. 

 The land slopes sharply to the west. The soil is a gravelly loam. For 

 the last four years the vineyard has been poorly cared for, and the vines 

 have not been sprayed. In 1905, the black-rot destroyed nearly the 

 entire crop. The variety is Concord. 



No accurate results were obtained from Mr. Sperry's vineyard. 

 The grapes rotted badly, burst open early, and were picked before the 

 yields were computed. The results as shown by field notes substantiate 

 in a general way the findings secured in the other two vineyards. 



A plat or block was chosen in each vineyard, all parts of which plat 

 were under nearly uniform conditions. Thirteen rows, each twenty to 

 twenty-five rods long, were selected and treated as follows: 



"i. Check (unsprayed). 



2. Bordeaux, 5-4-40 + sulphur 6 lbs. to 40 gals. 



