282 Peach-Growing 



ists whose interests do not warrant the construction of a 

 cooking plant." 



When a grower uses one of the commercial brands of 

 lime-sulfur, he should follow directions supplied by the 

 manufacturer in applying it. 



Miscible oils. 



These are essentially petroleum oils that have been so 

 treated that they will emulsify with water. They are pro- 

 prietary preparations and should be used in accordance 

 with the nature and strength of the different brands. They 

 have been much employed in the past in spraying for San 

 Jose scale and they are also used successfully in controlling 

 the peach-lecanium or terrapin-scale. Under some con- 

 ditions they may be more convenient to use as a dormant 

 scale-spray than the lime-sulfur mixtures. 



Tobacco extracts. 



As indicated under the discussion of the "black" and the 

 "green" aphids, preparations made by extracting the nico- 

 tine from tobacco stems and other tobacco refuse are very 

 effective in controlling these soft-bodied insects. Several 

 commercial brands of such preparations are on the market. 

 Of these preparations and their use Quaintance ^ speaks as 

 follows : 



"Aphids are killed by surprisingly small quantities of 

 nicotine in water, and because of the entire safety with 

 which it can be applied to plants nicotine is better suited 

 than other sprays to control these insects [aphids or plant- 

 lice] ; while the cost of the concentrated article is high, the 

 extent to which it may be diluted makes the spray compare 

 1 Farmers' Bull. 804. 



