12J: Bulletin 188. 



Arsenites of Lime and Soda. 



These have the advantages of being cheap, the anionnt of arsenic 

 is under perfect control and it does not bnrn the foliage. For 

 chewing insects. 



Ai'senite of lime is made by boiling 1 pound white arsenic in 2 to 4 

 quarts water until it is dissolved, then use this arsenic solution to slack 

 2 pounds good lime, adding water if necessary to slack it ; when 

 slacked, add water enougli to make 2 gallons of this stock mixture. 



This may be kept in a tight vessel and used as desired. Tlioroughly 

 stir the material before using. For most insects one quart of the 

 above to 40 gallons will be sufficient. Arsenite of lime is insoluble 

 in water and will not injure tlie foliage of any orchard fruit at this 

 strengtlh This insecticide is growing in popularity. Some green 

 dye stuff may be mixed with it to prevent the ever-present danger 

 of mistakino; it for some other material. 



Arsenite of soda. The arsenic (1 lb.) may also be boiled with 4 

 pounds of sal soda crystals in 2 gallons water until dissolved, and 

 tliis solution used in the same manner (with lime). The arsenite 

 of lime is cheaper, and either can be used w^itli Bordeaux mixture 

 the same as Paris green. AYhen used with water, however, it will 

 be safer to put in some freshly slacked lime. 



Other Arsenites. 



Green arsenoid and Paragrene are more bulky and finer than 

 Paris green, and when of good quality they are just as effectual and 

 require less agitation. Arsenate of lead can be applied in large 

 quantities without injury to the foliage, hence it is very useful 

 against beetles and similar insects that are hard to poison ; it also 

 adheres to the foliage a long time. 



Normal or 1.6 Per Cent Bordeaux Mixture. 



Copper sulfate (Blue vitriol) - 6 pounds 



Quicklime (Good stone lime) 4 " 



AVater 50 gallons 



For peaches and Japanese plums, an extra amount of lime should 

 be added, and more water (60 to 70 gallons) should be used. 



