502 Report op the Mycologist op the 



about 30 gallons per jicie will be required; two nozzles per row 

 will use about GO gnllous per acre, and so on. When a knapsack 

 sprayer is used the quantity of mixture required will vary from 

 60 to 100 gallons per acre, according to the size of the plants. 



The kind of spraying machinery to be used depends upon the 

 acreage to be si)rayed. For small fields of three acres or less a 

 knapsack sprayer is entirely sufficient and more economical than 

 a power niaithine. However, if it is desired to use the same ap- 

 paratus for spraying in the orchard it would be advisable to use 

 the barrel pump outfit described below. The knapsack sprayer 

 can also be used for applying fungicides and insecticides 

 to small fruits and vegetables. The knapsack sprayer is rapidly 

 taking its place as a part of the necessary farm machinery. 

 There are several kinds varying in i)ri(e from |10 to |15. One 

 of the best can be purchased for |12. 



For larger fields it will be found advantageous to use horse ma- 

 chines. Here again we have quite a variety, some better than 

 others but none perfect. It is advisable to buy only on approval. 

 If the dealer is not willing to have his machine tested it is a good 

 indication that there is something wrong about it. For a discus- 

 sion on spraying machinery see Bulletin No. 74 of this Station. 



A cheap and very serviceable outfit for spraying potatoes may 

 be made by mounting a force-pump in a barrel which is hauled 

 through the field on a two-wheeled cart. The nozzles are fas- 

 tened at the rear of the cart in such a position as to wet as much 

 as possible of the foliage. One man can work the pump and do 

 the driving, spraying two rows at a time. With slight changes 

 in the hose, this outfit can be used for spraying in the orchard. 

 Good brass-lined foice-pumps for the jmrpose can be bought 

 for $10. 



Full directions foi- the preparation of Bordeaux mixture can be 

 obtained from Bulletin No. 86 of this Station. Copper sulphate 

 should not cost more than 5 cents per pound. In barrels of 350 

 lbs. it can be ])urcliased for 4^ cents per pound f. o. b. New 

 York. It can be kept indefinitely without losing its strength. 



The treatment which has given the best results and which is 



