26 PROTECTION OF PLANTS- — 1923-24 



Division of Forest Insects. 



Officers of this Division have been engaged in investigating such important 

 pests as the Spruce Budworm which during the last decade has ravaged spruce 

 and balsam forests in Ontario, Quebec and New Brunswick; species of bark- 

 beetles including the Destructive Spruce Bark beetle affecting all our species 

 of spruce; the destructive pine bark beetles; the Douglass Fir Bark-beetle 

 in British Columbia, and others which attack various coniferous trees; the 

 Satin Moth, a European pest recently introduced into British Columbia, 

 which attacks willows and poplars; the I.arch Sawfly, which is increasing in 

 eastern Canada and concerning which special life-history and parasite studies 

 have been in progress in New Brunswick; the Fall Web worm, the Forest Tent Ca- 

 terpillar, the White-marked Tussock moth, and other forest and shade tree pests 

 which have received special study in New Brunswick, particularly with regard 

 to their natural control by parasitic and other agencies. This Division, in addi- 

 tion, has established numbers of forest sample plots in Quebec, Ontario and 

 New Brunswick, the trees in which are studied each year much valuable inform- 

 ation being secured regarding the insects and other agencies which affect the 

 health of the timber, and the extent to which each is injurious. The Divi- 

 sion has permanent field laboratories at Fredericton, N. B; Ajdmer, Que; 

 Indian Head, Sask; and Vernon, B. C, and temporary laboratories in other 

 districts. 



Division of Foreign Pests Suppression. 



The officers of this Division are specially charged with the administration 

 of the Regulations of the Destructive Insect and Pest Act, in so far as insects 

 are concerned. Previous to Sept. 1st, 1923, nursery stock entering Canada 

 from countries other than Europe (including Great Britain) was subject to 

 fumigation with hydrocyanic acid gas for a period of 45 minutes. Fumigation 

 stations for this purpose were erected at St. John, N. B; St. Johns, Que; 

 Niagara Falls and Windsor, Ont; Winnipeg, Man; North Portal, Sask; 

 and Vancouver, B. C. In addition to fumigation, nursery stock from the 

 States of Vermont, New Hampshire, Maine, Massachusetts, Connecticut and 

 Rhode Island, and also from Europe and Asia, was inspected. During 

 the ten years ending March, 1923, approximately, 20,000,000 plants were 

 examined by federal inspectors, as a result of which such foreign pests as 

 Gipsy Moth, Brown-tail Moth, Apple and Cherry Ermine Moths, European 

 Corn Borer, San Jose and other scale insects, etc., were intercepted. Field 

 scouting to reduce the infestation of the Brown-tail Moth in New Brunswick 

 and Nova Scotia has been very successful. In addition, other scouting work 

 has been conducted for such introduced pests as the European Corn Borer 

 and the European has been conducted Apple Sucker as a result of which 

 areas have been quarantined in Ontario, for the former insect and in Nova 



