Sl|e Canailtaq Xntomolagbt. 



Vol. XLVII. LONDON. MAY, 1915 No. 5 



POPULAR AND ECONOMIC ENTOMOLOGY. 



Some of the Benefits from Spraying with Arsenates in the 

 Apple Orchards of Nova Scotia.* 



by geo. e. sanders, field officer, 



Entomological Branch, Dominion Department of Agriculture. 



During the seasons of 1912 and 1913 an experiment was con- 

 ducted by the local laboratory of the Entomological Branch to 

 determine the extent of benefit from each of the four sprays then 

 applied to the orchards of the Annapolis Valley in controlling the 

 three most important groups of biting insects, namely, the Bud- 

 moths, the Fruit Worms and the Codling Moth. 



The orchard under experiment was six to seven years old, 

 Standard trees forty feet apart, with Wagner fillers eight feet two 

 inches apart, and when taken was moderately infested with Bud- 

 moths, heavily infested with Fruit Worms and moderately infested 

 with Codling Moth. The results throughout were taken on 

 Wagners. Ten acres of orchard were used, divided into plots of 

 10-12 acres each. 



The composition of the spray used was commercial lime and 

 sulphur, one to thirty-five, and Swift's acid paste lead arsenate, 

 five pounds to one hundred gallons; it was applied with a hand 

 pump. The first application was made when the buds were 

 bursting, as soon as the first Bud-moth started eating its way into 

 the bud, to be referred to as spray 1. The second was applied 

 from two to three days before the blossoms opened, to be referred 

 to as spray 2. The third was applied immediately after the blossoms 

 fell, to be referred to as spray 3, and the fourth was applied two 

 weeks later, to be referred to as spray 4. 



The infestation of Bud-moths in the buds in the unsprayed 

 checks at the end of the experiment was 59.56 per 100 buds, while 



*Contributions from the Entomological Branch, Department of Agriculture, 

 Ottawa. 



