No. 4.] SHADE-TREE INSECT PROBLKM. 105 



Trees 8 to 10 inches in diameter, . . f 50 to $1 00 



Trees 12 to 20 inches in diameter, . . 1 00 to 2 00 



Trees 24 to 30 inches in diameter, . . 3 00 to 4 00 



Trees extra large, 6 00 to 10 00 



Dr. E. P. Felt, State entomologist to New York, has 

 given this subject much attention, and kindly sends me the 

 data of some large spraying operations. 



At Lansingburg, N. Y., a large number of street trees 

 (exact number not given) were sprayed by Mr. H. "W. Gor- 

 dinier of Troy, N. Y., at a net cost of 23 cents per tree. 

 Mr. Gordinier is personally known to the writer, and, as he 

 carries on contract spraying as a side line, his estimates of 

 cost are entirely worthy of credence. He figures that the 

 actual cost of spraying elms as they run, large, medium and 

 small, is from 50 to 60 cents each. 



Dr. Felt also writes that in 1900 Mr. F. W. Wells, super- 

 intendent of streets at Saratoga Springs, sprayed 5,667 trees 

 at a net cost of 17 J cents per tree. The trees were between 

 20 and 80 feet in height. The outfit used was a power 

 sprayer with elevated tower. 



These varied estimates will give a general idea of the cost 

 of spraying operations as carried on both with hand and 

 power apparatus. It should be borne in mind that in some 

 cases cheap spraying is not always the most effective. The 

 figures given by Mr. Gale are to my mind highly suggestive 

 when applied to Massachusetts conditions, although they are 

 lower than would be the case in the average town or city, 

 because of the large number of small elms which were 

 sprayed from the ground. 



The writer's estimate of spraying trees once with arsenate 

 of lead, using a suitable hand outfit, and with labor at $2 

 per day, is as follows : 



Trees 10 feet tall, . $010 



Trees 15 feet tall, 15 



Trees 20 feet tall, 25 



Trees 30 feet tall, 40 



Trees 40 feet tall, 50 



Trees 50 feet tall, 1 00 



Trees 60 feet tall, 2 00 



Trees 70 feet tall, 4 00 



Trees 80 feet and over, . . . . $5 00 to 10 00 



