SPRAYING. FORMULAS. PESTS AND FRIENDS 57 



quarter pound of Paris green, fifty gallons of water. 

 The lime helps to neutralize the caustic action of 

 Paris green on tender foliage ; potato vines are so 

 tough, however, that in their case the lime may be 

 omitted, if desired. Keep mixture well agitated while 

 spraying. (Not so safe as arsenate of lead on very 

 tender foliage.) 



Arsenate of lead: This can be made at home, 

 as follows : Take twelve ounces of acetate of lead, 

 four ounces of arsenate of soda, and fifty gallons of 

 water. Put the acetate of lead into a gallon of water 

 in a wooden pail; in another wooden pail put the 

 arsenate of soda in two quarts of water. When both 

 are dissolved, pour them together into the spray 

 tank containing the required amount of water. A 

 white precipitate of lead arsenate immediately forms 

 in the tank and the mixture is ready to be applied. 

 This remains in suspension longer than Paris green. 

 The ready-prepared commercial form simply needs 

 dissolving in water about two pounds to fifty gal- 

 lons of water. (For rose-bugs use ten pounds to 

 fifty gallons.) 



White hellebore : This, if fresh, may be used 

 instead of Paris green in some cases worms on cur- 

 rant and gooseberry bushes, for instance. (It is not 

 such a powerful poison as the arsenites, and would 

 not do so well for tough insects such as potato 

 bugs.) Steep two ounces in one gallon of hot 

 water, and use as a spray, stirring it often. 



FOR SUCKING INSECTS. Now we come to another 

 class of insecticides, suited to insects which suck a 

 plant's juices but do not chew. Arsenic will not kill 

 such pests ; therefore we must resort to solutions 

 which kill by contact. Here are some of the best- 

 known recipes of this kind : 



