xiv Proceedings. \January gth,igi2.. 



Act was passed, which prohibited the importation of trees, 

 plants, and other nursery stock from countries in which the 

 scale was present. Later, in 1901, this enactment was modified, 

 and the aforementioned vegetation was allowed to enter Canada 

 at certain periods of the year, and through certain ports, at 

 which were erected fumigating houses for the fumigation of the 

 plants with hydrocyanic acid gas. In 1899 other enemies of 

 field and garden crops invaded our territories from the "United 

 States. The Pea Aphis {Macrosiphiwi destructor Johnson)- 

 appeared in enormous numbers in Ontario and the maritime 

 provinces, causing considerable damage. The two Asparagus 

 beetles {Crioceris asparagi L., and C. 12-punctata L.) crossed 

 over from the State of New York into the Niagara peninsula. 

 The invasion or first appearance of other injurious insects might 

 be mentioned, but this summary of the history of insect invasions 

 of Canada has already reached a considerable length, and the 

 last insect to migrate into our territories from the United States 

 will alone be considered. This insect is the Brown-tail Moth 

 {Euproctis chrysorhoea L.), which appears to have been intro- 

 duced into the State of Massachusetts on nursery stock from 

 Europe about 1890, and together with the Gypsy Moth {Porthetria 

 dispar L.), which was also introduced from Europe into 

 Massachusetts, has spread over a large area in the New England 

 States, has entailed enormous losses and the expenditure of 

 millions of dollars in control and eradicative work. At the 

 present time, in the State of Massachusetts alone, over a million 

 dollars are annually being spent in endeavouring to control and 

 prevent the spread of these two species of introduced insects. 

 The Brown-tail Moth gradually spread in a north-easterly 

 direction, and in 1902 specimens of the moth were taken in New 

 Brunswick, but it was not until 1907 that evidences of the actual 

 establishment of the insect were found in Canada. In that year 

 thousands of the winter webs in which the young caterpillars 

 pass the winter were found in Nova Scotia, and the further 

 discovery of the insect in 19 10 in New Brunswick indicated 

 that it had firmly established itself in Canada. 



