154 THE EEiPOET OF THE No. 36 



of favored food plants, and of destroying the caterpillars in the spring and early 

 summer by the use of arsenate of lead spray and the application of bands of tangler 

 foot. This work has an important bearing on the spread of the Gipsy Moth. If 

 tanglefoot bands are applied to trees before the caterpillars hatch it serves to keep 

 ^ny of those that may hatch from egg clusters on the ground from climbing to the 

 tops of the trees and being blown long distances and establishing new infestations. 



The territory inside the area known to be infested by the Gipsy Moth as well 

 as that infested by the Brown-tail Moth, has been placed under quarantine by the 

 Federal Horticultural Board, in order to prevent the shipment of trees or plant 

 products which might disperse these insects to uninfested territory. For the 

 purpose of enforcing these quarantines the infested territory is divided into sec- 

 tions in each of which an inspector is located, whose duty it is to examine all such 

 plant products, as well as stone and quarry products which are shipped outside the 

 infested area. This work has prevented the dissemination of the Gipsy Moth and 

 Brown-tail Moth to many widespread areas. In connection with the inspection 

 work, as related to the Brown-tail work, it should be of interest to residents of the 

 Dominion to know that during the past three years inspectors have been main- 

 tained at junction points where long distance trains have passed out of the infested 

 area in order to examine the trains and destroy any Brown-tail Moth^ that might 

 be attracted to the lights. Large number of moths have been destroyed as a result 

 ■of this work, especially heavy infestations having been destroyed on trains 

 passing through White Eiver Junction, Vermont, north bound. 



Other phases of the work carried on by the Bureau of Entomology are largely 

 experimental. 



Silvicultural experiments are being carried on to determine the most resistant 

 stands and the best composition of tree growth to withstand continued Gip^y Moth 

 attack. 



The parasite work was first begun in Massachusetts by a co-operative arrange- 

 ment between the State and the United States Department of Agriculture. Para- 

 sites attacking these insects in different stages were imported for several years 

 from Europe and Japan, and up to the present time, several species have become 

 firmly established, and progress has been made toward checking the increase of 

 these pests. 



As has already been stated by Mr. McLaine, three of the species concerned, 

 namely, Apanteles lacteicolor, Compsilura concinnata, and Calosoma sycophanta, 

 have been introduced into Canada during the last two or three years, as a result of 

 a co-operative arrangement between Dr. Hewitt and the Bureau of Entomology. 

 These species have become so abundant in certain sections of the infested area that 

 they can be collected in considerable numbers in the field, and they are secured 

 in this way for colonization in areas Avhere the species are not known to exist. 

 This work is also being done by the Bureau in order to bring about the rapid 

 establishment of these insects in the infested area. 



Apanteles lacteicolor, which is a parasite of the Gipsy Moth, as well as of the 

 Brown-tail Moth, has been colonized over practically all the area where these species 

 are now known to exist. During the past year, many colonies were liberated in 

 eastern Maine, and it is not considered necessary to make liberations next year. 



Compsilura concinnata has been colonized over a slightly smaller area. It 

 attacks both the Gipsy and the Brown-tail caterpillars, and more colonization will 

 be necessary, particularly in eastern Maine next summer. 



The spread of Calosoma sycophanta has been slower than the other species 

 previously mentioned, although they are present in practically all the territory that 



