332 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 6 



Mr. D. M. Rogers will have charge of the inspection and quarantine work. Since 

 the Federal Horticultural Board placed a quarantine on the region in New England 

 infested by the gipsy and brown-tail moths, it has been necessary to devise and carry 

 out a careful system of inspection to prevent the dispersion of these species on lumber, 

 forest products, nursery stock, etc. The inspection of nursery stock is being carried 

 on in cooperation with the inspectors in the states concerned. 



The scouting work to determine the quarantine line, and also the scouting and 

 control work to prevent the spread of the gipsy moth, has been placed in charge of 

 Mr. L. H. Worthley. During the winter particular attention has been paid to the 

 infestations along the northern and western borders of the outside infested territory 

 and a large force of men has been employed to stamp out incipient infestations in this 

 region and to examine the territory outside the border not known to be infested. 



A new line of work has been taken up during the winter, as a result of experimental 

 and field observation work, on the relation of different food plants to the gipsy 

 moth. After consultation with the United States Forest Service an arrangement 

 was made whereby cooperative work will be attempted, and a series of sylvicultural 

 experiments have been planned and are being conducted by Mr. G. E. Clement in 

 order to determine the relation of gipsy moth injury to the sylvicultural condition 

 of the trees in areas where this insect is prevalent. 



The parasite work will be continued along the same general lines, as heretofore, 

 with special work to determine the increase and spread of the beneficial species that 

 have been int'roduccd from foreign lands. A long series of experiments will be 

 continued to determine the preference of gipsy moth caterpillars for different food 

 plants and this information will be supplemented by the work of a number of field 

 observers. In addition, studies will be made during the year to determine 

 definitely the increase or decrease of the species in areas which have been specially 

 selected for this purpose. These areas are well scattered over the entire infested 

 territory and the tree growth which is found throughout the region is well represented 

 in them. As a result of these experiments it is hoped that much datamay be secured 

 which will have an important bearing on the susceptibility of different trees and 

 shrubs to gipsy moth attack, as this information is of utmost importance in deter- 

 mining the best methods of thinning woodland. 



An investigation on the "wilt" disease is being carried on in cooperation with the 

 Bussey Institution, Harvard University. The technical aspects of this work are 

 being directed by Dr. W. M. Wheeler of that Institution, and Mr. R. W. Glaser, 

 who has made a special study of the organism which is responsible for the "wilt" 

 disease, is carrying on a large number of investigations. 



The insects which attack trees that are defoliated or weakened by the gipsy moth 

 are being given special study, particularly those species which attack oak. This 

 work is being carried on cooperatively with the Branch of Forest Insect Investigations 

 of the Bureau of Entomology, and Dr. A. D. Hopkins, who has charge of these 

 investigations, is directing the work on this project. An extensive series of experi- 

 ments is being carried on to determine the methods by which the gipsy moth is 

 spread. Special attention is being paid to the spread of young caterpillars by wind, 

 and also the relation of velocity and temperature to wind spread. An effort is being 

 made to determine how far small caterpillars can be carried in this way. These 

 experiments are of vital importance as they have a definite bearing on the kind and 

 amount of hand work which should be carried on in the towns outside the known 

 infested area. 



The Boston office, which has, for a number of years, been located at 6 Beacon 

 Street, was moved May 5 to the Carney Building, 43 Tremont Street, and com- 

 munications by mail should be sent in the future to that address. 



