1908.] PUBLIC DOCUMENT No. 73. 153 



BEVERLY, JULY 5, 1907. 



On this date a long, narrow strip of woodland near a river was 

 sprayed, under the direction of the local superintendent. The water 

 supply being near at hand, the cost of treatment was notably reduced. 

 All told, 6 acres of woodland, averaging 100 trees, 45 to 65 feet in 

 height, per acre, were sprayed in six hours with 2,100 gallons of spray- 

 ing mixture, containing 14 pounds arsenate of lead to 100 gallons of 

 water. 



Out-fit. 



A 4^2 horse-power Olds gasoline engine, with double-acting pump 

 and 350-gallon tank, was the essential feature of the outfit. A single 

 line of l"|/2-inch hose and ^-inch nozzle delivered the spray under a 

 pressure of 125 pounds. 



Cost. 



1 foreman, day, . . . . . . . &2 50 $1 88 



1 team and driver, f day, . .... 5 00 3 75 

 5 men, f day, . 2 00 7 50 



294 pounds arsenate of lead, , . . . . . 11 32 34 



2 gallons gasoline, ....... 18 36 



Oil, grease and waste, ........ 04 



Total, . . $45 87 



Average cost of treatment, 7.6 cents per tree, or $7.65 per acre. 



SWAMPSCOTT, JULY 5, 1907. 



The spraying operation in this case is of interest since it was done 

 with the ordinary outfit used m oil-burning of infested walls and brush 

 land. It was necessary to carry the water in buckets a considerable 

 distance. Twelve apple trees, ranging from 20 to 35 feet in height, 

 together with about ^4 acre of brush that had grown up in the old 

 orchard, were treated. Six tanks of spray, containing arsenate of lead 

 at the rate of 23 pounds to 100 gallons of water, were used. 

 



Outfit. 



On a 20-gallon cask a common Johnson hand pump was mounted, 

 and connected with 50 feet of ^/o-inch hose with extension rod and 

 single Vermorel nozzle. 



Cost. 



2 men, day, ... .... $2 25 



27% pounds arsenate of lead, . . . . 12 



Total, . . . . $5 55 



Average cost of treatment, 46 cents per tree. 



