42 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 3 



cial value for treating trees in parks and cities, and in most cases they 

 can be used for such work without any special modification. 



For orchard spraying or treating low-growing trees, the same system 

 could be used, but it would be necessary to reduce the weight of the 

 outfit and make changes that would render it more suitable for this 

 class of work. 



All spraying must be done rapidly and thoroughly if satisfactory 

 results are secured. This system of treatment seems to answer these 

 requirements, and if modified sufficiently to conform to the spe- 

 cial kind of work desired it should give satisfactory results. 



Mr. Headlee : Has the dust sprayer been used in Massachusetts on 

 the gypsy moth work ? I noticed in the exhibition room an apparatus 

 for spraying trees, using dry arsenate of lead, and would like to know 

 what success has been attained with this method of spraying. 



Secretary Burgess: So far as I know, the dust method of spray- 

 ing has not been used on the gypsy moth work. Last season some 

 experiments were conducted with a bomb made somewhat similar to 

 the bomb shells used for fireworks. This shell carried a charge of 

 dry arsenate of lead, which was shot up into the air and exploded, 

 so as to distribute the poison over the trees below. Its oL^y use is in 

 inaccessible woodland areas, where it is impossible to use a wet spray. 

 This device is only partially successful ; one of the troubles being that 

 it was not possible to secure a grade of dry arsenate of lead which 

 was fine enough to be distributed evenly over the trees. 



Mr. Frost : The gypsy moth problem in New England is a most 

 extensive one, and owing to the large areas of woodland which are 

 infested, I believe at the present time is more of a forestry problem 

 than an entomological problem. The forest area which is infested is 

 largely covered with deciduous trees, which suffer greatly from the 

 attacks of the insect. Last winter the gypsy moth work was placed 

 in +l-'e hands of the state forester, and I am inclined to think the 

 pr >blem can be worked out better along forestry lines. 



While in Europe during the past summer, I was surprised to note 

 the large number of coniferous trees which exist, as compared with 

 the relatively small areas covered with deciduous growth. 



It seems to me that this may be one factor in holding the gypsy moth 

 within bounds in that country, as the young caterpillars cannot feed 

 upon coniferous trees. 



I am inclined to think it will be necessary to reforest large areas in 

 the gypsy moth infested district, by replacing the hardwoods with 



