76 FIELD WOKK AGAINST GIPSY AND BEOWN-TAIL MOTHS. 



many colonies from becoming established at distant points, but 

 although nearly 250 miles of roadwa3^s have been treated in this man- 

 ner in Massachusetts, there is still a very large mileage of trunk roads 

 which can not be given proper attention with the funds at hand. 

 The need of more work in the infested area is very urgent, as this is 

 the only possible way to prevent the continued spread of the insect 



Fig. 22.— Map of New England, showing areas infested by the brown-tail moth from 1897 to 1909. (Original.) 



until the parasites and natural enemies which are being introduced 

 have an opportunity to show their capacity for reducing the pest. 

 The importance of the work against this insect extends beyond state 

 lines or sectional lines and should receive the cordial support of all 

 who are interested in agriculture, horticulture, or forestry. 



