1908.] PUBLIC DOCUMENT No. 73. 155 



SOMERVILLE, JULY 6, 1907. 



Spraying of 12 small shade trees averaging 30 feet in height, 90 per 

 cent, being climbed. 



Outfit. 



Two lines of 1 / 2 -inch hose 100 feet long, equipped with Bordeaux 

 nozzles, were supplied by Pomona hand pump mounted on a 50-gallou 

 barrel. Arsenate of lead was used at the rate of 18 pounds to 100 

 gallons of water. 



Cost. 



1 horse and wagon, day, . . .. $2 00 $0 33 



3 men, day, . 2 00 99 



pounds arsenate of lead, . . . 11 1 49 



Total, . .... $2 81 



Average cost of treatment, 23 cents per tree. 



DANVERS, JULY 10, 1907. 



During the day this outfit was under observation, 91 large shade 

 trees, 14 evergreens, 7 small trees and 12 shrubs were treated. The 

 trees, principally maple, averaged nearly 60 feet in height, and 50 per 

 cent, were climbed. 



Outfit. 



This outfit consisted of a 4 a /2 horse-power Olds gasoline engine, a 

 double-acting pump and a 350-gallon tank. Three lines of ^-inch hose, 

 with extension rods and 3-way Vermorel nozzles, were in use. Disparene 

 was applied at the rate of 11 pounds to 100 gallons of water, using a 

 pressure of from 300 to 125 pounds. 



Cost. 



1 engineer, 1 day, . ... $2 00 S2 00 



3 men, 1 day, . . 2 25 6 75 



1 team and driver, 1 day, . 5 00 5 00 



50 pounds disparene, . 1 1 5 50 



1\ gallons gasoline, ... . . 20 50 



Oil, grease and waste, . . .... 50 



Total, . $19 80 



Average cost of treatment, 17.6 cents per tree. 



LYNN, JULY 13, 1907. 



Work along parkways in the Lynn Woods. During the day that the 

 two outfits described below were in operation, a strip of road 1 mile 

 long was sprayed to a depth of about 150 feet on both sides of the road. 

 On one side of the road the underbrush had been removed, but on the 

 opposite side no pruning or cutting had been done. The ground cov- 



