194 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 5 



majority of orchardists, after spraying for the "flies," applied lime- 

 sulphur solution at winter strength to destroy the eggs. In only a 

 few plantings was it necessary to make a third treatment with a nico- 

 tine spray to kill the young nymphs. 



In summing up the results of the spraying operations it was con- 

 cluded that the chief factors which make for the successful control of 

 the psylla are (1) a knowledge on the part of the grower of the different 

 stages of the insect; viz., hibernating "flies," eggs and nymphs; (2), 

 an understanding of the activities of the psylla during the dormant 

 season until trees blossom; and (3), thorough work in spraying. 



PROGRESS IN EXTERMINATING TWO ISOLATED GYPSY 

 MOTH COLONIES IN CONNECTICUT 



By W. E. Britton, Agricultural Experiment Station, New Haven, Conn. 



In March, 1906, it was learned that the gypsy moth, Porthetria 

 dispar Linn., was present in Connecticut at Stonington, the southeast 

 corner town of the state. An immediate investigation showed the 

 infestation to be a separate one of less than a square mile in area, and 

 about fifty miles from Providence, R. I., the nearest point known to 

 be infested. Measures were at once started with a view to complete 

 extermination rather than mere suppression, as must be practiced 

 in the large and badly infested sections of Massachusetts and New 

 Hampshire. 



In December, 1909, another isolated infestation was discovered in 

 the village of Wallingford, twelve miles north of New Haven. Here 

 the infested territory was probably no larger than that at Stonington, 

 but was much more thickly infested and less scattered. 



The exterminative work has not been done wholly by the state of 

 Connecticut. The Bureau of Entomology has a special appropriation 

 for gypsy moth work, and a portion of it under the supervision of 

 Mr. D. M. Rogers, has been used to aid and supplement the work of 

 the state. 



We are now able to consider the progress made in six years at Ston- 

 ington and in two years at Wallingford. The object of this paper is 

 to show the results of this work in figures, so far as may be possible. 



The methods employed were those in common practice in Massa- 

 chusetts and other infested states. Scouting for egg-masses during 

 the winter months when the trees are bare, destroying the eggs with 

 creosote; pruning, scraping and filling the cavities of trees; banding 

 trees in summer with burlap and in some cases with tree tanglefoot; 

 spraying trees and shrubs with lead arsenate. In scouting for egg- 



