HOW TO INCREASE THE POTATO CROP BY SPRAYING. 



Fig. G.— In foreground, potato plants not sprayed for the Colorado potato beetle; in background, sprayed 



potato plants. 



Arsenate of lead has the following advantages over Paris green: 

 (1) It contains less soluble arsenic; (2) it is less harmful to young 

 growing j^lants, and when applied in the proper manner and at the 

 proper strength does not scorch them; (3) it adheres more strongly 

 to the foliage; (4) it is less troublesome to prepare; and (5) it is of 

 greater value than other arsenicals (except zinc arsenite) in that it 

 leaves a white coating on the foliage, so that its presence or absence 

 can be detemiined readily after spraying. 



Tlie adhesiveness of spraying material is promoted by the addition 

 of the same weight of soap as of the arsenical used. The soap may 

 be either resin fish-oil, or lamidry soap, preferably the former. 



The formula is as follows : 



Ai'senate of lead (i^owder) pound . . 1 



Soap for "sticker" do 1 



Water or Bordeaux mixture gallons. . 25 



If the paste form of arsenate of lead is used, 2 pounds to 25gallons 

 of the liquid is the proper proportion. 



For small gardens two-thu'ds of an ounce, or 10 level teaspoonfuls, 

 of the jjowder to 1 gallon of water is used. 



Two or three sprayings ordinarily wiU suffice for the spring genera- 

 tion if applied before the eggs arc hatched, and about the same num- 

 ber should be employed for the second generation. One or two spray- 

 ings for tlie thii^d generation, when it aj^pears, also should bo given. 



