PEAR GROWING IN CALIFORNIA. 



401 



FIG. 186. The pears and leaves in this picture show the very even distribution 

 of arsenate of lead, indicating a thorough job of spraying. 



SPRAY FORMULAE. 

 No. 1. Lime-Sulphur Commercial. 



Practically every insecticide company manufactures lime-sulphur, 

 consequently there are a great many different brands of this material 

 on the market, most of which are good. It is prepared, as a rule, in the 

 form of a liquid, although recently a powdered lime-sulphur has been 

 put on the market. This form has not yet been used extensively enough 

 so that it can be recommended. The liquid lime-sulphur is diluted for 

 use on pear trees while they are dormant by adding to 1 gallon of the 



