Insecticides, Fungicides and Spray Machinery 171 



by most planters. The arsenate of lead and fish-oil 

 soap should be dissolved in 2 or 3 gallons of water 

 and this amount poured into the remainder of the 50 

 gallons and thoroughly stirred until the mixture is 

 evenly dissolved. The fish-oil soap is added only as a 

 sticker but it also gives a more even covering of the 

 plants. However, this may be eliminated with all the 

 sprays for all plants except those that have slick leaves. 

 If powdered arsenate of lead is used, one-half the above 

 amount should be mixed. 



Paris green is a chemical compound of white arsenic, 

 copper oxide and acetic acid. The compound is known 

 as aceto-arsenite of copper. When properly prepared, 

 it should be of uniform composition and contain very 

 little insoluble matter. This is a deadly poison and is 

 very effective when used for biting insects. This should 

 be prepared by dissolving 5 ounces of paris green and 

 50 gallons of water, and if desirable the fish-oil soap, 

 as in the arsenate of lead preparation, may be used or 

 left out, as it is only necessary for sticking. The 

 grower must bear in mind that paris green will burn 

 the plant much more readily than arsenate of lead. 

 To prevent this burning, it is advisable that a small 

 amount of hydrated lime, at least 3 pounds, be used 

 in the spray. Paris green usually costs more than 

 arsenate a£ lead and, considering its burning qualities, 

 it is advisable to use the latter. 



Arsenite of lime is easily prepared at home and is 

 very effective." The proportions are: 



White arsenic, 1 pound. 

 Crystal sal soda, 4 pounds. 

 Water, 1 gallon. 



