134 PROTECTION OF PLANTS. 1916-17 



The number of eggs parasitized was exceedingly high. In 1914 from 

 July 21st to August 3rd inclusive the writer collected 1359 eggs from orchards 

 at Baie D'Urfe, Ste. Annes and Ste. Marie, and seventy-seven per cent of 

 these had the characteristic black coloration indicative of the presence of the 

 parasite. As eggs parasitized shortly before being collected would not 

 show this black coloration the actual number of parasitized eggs probably 

 exceeded seventy-seven per cent. 



CONTROL 



In 1893 Slingerland recommended spraying for the bud moth just 

 before the hibernating larvae emerge in the spring when the buds begin to 

 burst, so that the first meal of the little caterpillars would be a fatal one. 

 This method has been advocated for several years but experiments show that 

 this is not the time for most effective spraying. The larvae which emerge 

 before the buds open do not feed on the outside of the bud except for the 

 first few bites necessary to effect an entrance into the bud. Unless there- 

 fore the buds are very thoroughly covered with poison the number of 

 caterpillars which escape poisoning in entering the bud may be comparative- 

 ly large. More important is the fact that emergence from hibernation is 

 continuous over two weeks and the majority emerge after the buds have 

 burst, and do not feed on the outer leaves which alone will have been 

 sprayed. 



Spraying Experiments in the Spring. — During the spring of 1915 the 

 writer conducted spraying experiments in a portion of the orchard of Mr. 

 Edward MaxweH at Baie d'Urfe. This orchard was chosen because during 

 the previous year the percentage of bud moth infestation had been exceed- 

 ingly high. 



The orchard was divided into fifteen plots each containing eight trees. 

 Five of these plots were left as checks and the others were sprayed with lime 

 sulphur (sp. gr. .008) to which lead arsenate was added at the rate of five 

 lbs. paste per 100 gallons. 



Sprays were applied as follows; — 



Spray 1. April 27th. The buds just starting to burst, the outer leaves 

 showing green. The larvae emerging from their hibernacula and entering 

 the buds. 



Spray d. May 4th. Buds expanded. Majority of the larvae entering 

 the buds. Only a few remaining in their hibernating nests. 



Spray 3. May 12th. Three or four days before the blossoms opened. 



Spray 4. June 3rd. After the fall of the petals. 



