50 Second Report on Economic Zoology. 



instance, it has little or no burning action on the leaves; nor is it so 

 easily washed off by rains. Moreover, I am sure it has considerably 

 greater killing power, as is shown by the following experiments. 



Two are taken from recent records by Professor Webster in 

 America, both carried out by different people, who are practical men, 

 in their own orchards against Codling Moth ; the third was one of a 

 series conducted by myself against Codling and Winter Moth. 



A. — Tn America. 



't'reatment. 



I'ercentage of picked 

 ft-uit injured. 



B. — In England. 



Percentage of fruit 

 injured by maggot. 



I Paris Green, \ lb. to 50 gallons of water 

 Arsenate of Lead (single strength) 

 Unsprayed ..... 



X 

 37-5 

 20-5 

 62-5 



X 



29-7 

 15-5 

 71-5 



Grimes' Golden Apple ; t Ben Davis ; $ Worcester Pearmain. 



These results show the benefit of this form of arsenical wash over 

 Paris green for Codling Moth. At tlie same time I should point out 

 that the trees sprayed by myself with the wash showed no marked 

 symptoms of Winter Moth ; the unsprayed were much eaten. 



The method of mixing the arsenate of lead is given in the First 

 Peport, p. 28, but it may be pointed out that a little treacle may be 

 added with advantage, about 1 lb. to the 16 gallons, which makes 



