274 



Appendix. 



The Bordeaux used for this work was of the formula four pounds of copper 

 sulphate, four pounds of lime, to forty gallons of water. Tests were made with 

 ferrocyanlde of potassium before each application, to make sure that the Bordeaux 

 was not acid. Spraying was begun on one plot as soon as the first leaves ap- 

 peared and continued as follows: First spraying, July 10; second spraying. 

 July '2i ; third spraying. August .3 : fourth spraying, August 8 ;■ fifth spraying, 

 August 21 : sixth spraying, August 27 ; seventh spraying, September 7. 



The other plot was not sprayed. At the early stage of growth the plots 

 did equally well so far as appearances went, but as the following table shows, 

 the sprayed plot tended toward a higher yield before the blight made its ap- 

 pearance. A few plants in each plot were attacked by the bacterial wilt. 

 Theee were pulled up and removed. The variety used in this experiment was the 

 Improved Long Green. Fruits were picked on both plots when they had reached 

 a proper size for pickles (2 to 21/^ inches). 



September 12th. blight began to appear on the unsprayed plot. Septem- 

 ber 21st, growth on the unsprayed plot had stopped, so that no new leaves 

 or blossoms were developed. By September 2.jth the unsprayed plants had all 

 turned yellow or dry and worthless, while the sprayed plot was in good con- 

 dition. October ."ith, the plants of the sprayed plot were still in good condition 

 and were setting blossoms and fruit, while the plants of the imsprayed plot were 

 entirely dead. October 12th, cold weather destroyed all vines. 



Tlie yield of cucumbers was as follows : 



Unsprayed 



August 22 



August 27 



August 31 



September 3 

 September 7 

 September 12 

 September 11 

 September 17 

 September 21 

 September 23 

 September 25 

 September 28 



October 2 



October 5 _.. 

 October 7-_- 

 October 10 — 

 October 13 ___ 



Total 



Three plots of muskmellons were planted, two of which were sprayed, the 

 third being left unsprayed. Owing to the cold season, none of the melons ma- 

 tured fruits. 



The result of spraying was practically the same with the melons as with the 

 cucumbers. Traces of blight could be seen on the sprayed foliage, but they were 

 not sufficiently abundant to do any liarm. The unsprayed plants succumbed to 

 the disease even before the cucumbers did. 



WHEN AND HOW TO SPRAY. 



In this climate downy mildew makes its appearance about August 1st, there- 

 fore spraying must begin some time previous to that date. Failures in the 

 past to control the disease have generally been directly attributable to neglect- 

 ing to spray until the disease liad made its appearance. At this time spraying 

 3s of very little value ; for after the mycelium of the fungus once gets into 

 the tissues of the leaf, the Bordeaux cannot act upon it. Bordeaux must always 

 be used as a preventive of disease rather than as a cure. For the first two or 



