SOLUTIONS FOR SPRAYING 141 



pound is not so good. In buying sulphur it is best 

 to secure samples and prices from different dealers 

 and then to buy in not less than barrel lots. Barrels 

 usually hold a trifle less than 200 pounds. The large 

 wholesale city druggists or manufacturers of chemi- 

 cals can commonly quote the best prices. 



Lime-sulphur is used at any time when the trees 

 are not in foliage. Winter spraying is common in 

 states south of Delaware and Kansas; but north of 

 Mason and Dixon's line, where the lime-sulphur is 

 more exclusively used, fairly late spring spraying is 

 most effective. The work must stop however when 

 the buds begin to open. 



PARIS GREEN 



For the omnipresent codling moth and for all leaf- 

 eating insects some form of poison is employed, nearly 

 always some form of arsenic. The most popular 

 arsenical poison is undoubtedly paris green. This 

 standard chemical (or mixture of chemicals) has cer- 

 tain positive advantages, and should generally be used 

 by those who are growing fruit on a small scale. It 

 is occasionally adulterated, but by buying of reliable 

 dealers one can nearly always avoid trouble. How- 

 ever, as adulterated paris green is likely to do serious 

 damage to the foliage, the fruit growers should be 

 careful at this point. It is well to remember that paris 

 green can be tested by dissolving in ammonia. Pure 

 paris green dissolves perfectly, making- a bright bluish 

 solution. Impure paris green does not dissolve com- 

 pletely in ammonia, there being some sediment. 



Paris green is now usually used in combination 

 with some fungicide, as explained later; but when an 

 insecticide only is needed, as to meet an invasion of 



