26 farmers' bulletin 845. 



the oak, which is a food plant favored by this insect, is one of the 

 predominating trees. 



The small colony of the gipsy moth which was fomid in Geneva, 

 N. Y., in 1912 has been exterminated. Effective work was done by 

 the State department of agriculture, and several inspections of the 

 colony and its surromi dings have been made by employees of the 

 Bureau of Entomology. The colony located at Mount Kisco, West- 

 chester County, N. Y., in May, 1914, has been treated thoroughly 

 and no egg clusters have been fomid during the past year. Persistent 

 work has been done in an attempt to stamp out this colony, both by 

 the State and by the Bureau of Entomology, and it is hoped that 

 this may be accomplished after another season's work. 



In February, 1914, a colony was reported on an estate at Bratenahl, 

 near Cleveland, Ohio. The territory was scouted thorovghly by 

 employees of the Bureau of Entomology and treatment applied by 

 the State nursery inspector. No infestation has been fomid in the 

 colony or its surroundings for more than a year, and it is believed 

 that the insect is exterminated. 



A small colony was found at Rutherford, N. J., in Jidy, 1914. It 

 has received careful attention and as a result of the work done has 

 been exterminatea. 



WORK CARRIED ON BY THE BUREAU OF ENTOMOLOGY. 



The work carried on by the Bureau of Entomology of the United 

 States Department of Agriculture is designed to prevent the spread 

 of these insects. 



Owing to the freedom with which the female brown-tail moth 

 flies it is difficult by hand measures to prevent the spread of this 

 species, as a heavy migration may take place into new territory 

 during any year when the wind is favorable at the time the moths 

 are flying. 



The spread of the gipsy moth has been much slower. All the 

 principal infestations found in new territory have been along the line 

 of the winds prevailing when the gipsy-moth caterpillars are hatching 

 in the spring. The greatest danger of spread is toward the north 

 and northeast, as the warm winds in the spring, particularly along 

 the coast, are from the south and southwest. In New Hampshire, 

 between the Merrimac and Connecticut Rivers, and in the infested 

 region south of it, extending through Massachusetts, Rhode Island, 

 and Connecticut to Long Island Sound, the problem of wind spread 

 has the greatest bearing on the further dispersion of the gipsy moth. 

 Scouting and extermination work is carried on extensively in this 

 region under the direction of Mr. L. H. Worthley and every effort 

 is being made not only to determine whether infestations exist in 

 the new territory, but to exterminate the insects in several tiers of 



