68 



FIELD WORK AGAINST GIPSY AND BROWN-TAIL MOTHS. 



It is obvious that the tower can not be used except for treatment 

 of roadsides, and where woodland areas are to be sprayed it is often 

 necessary to lay long lines of hose from the sprayer, which should 

 be located as near as possible to a supply of water. The State of 

 Massachusetts has conducted large spraying operations over thousands 

 of acres of forests of this character in the North Shore district with 

 excellent results. In some cases a line of hose more than one-fourth 

 of a mile long has been used, and it was possible to maintain sufficient 

 pressure at the nozzle to do satisfactory work. Woodland work 

 of this character is very expensive, owing especially to the amount 

 of labor required to carry the hose. A machine and crew of men 

 can usually cover about 12 acres of woodland per day, the entire 

 cost of treatment averaging about $10 per acre. Roadsides can be 



Fig. 18.— Spraying a roadside, using a combination tower and hand nozzle, 



(Original.) 



as to throw two streams. 



treated, where the tower is used, for about $2 per acre, and it is 

 possible under favorable conditions to spray 2 miles in a single day. 



With the last mentioned outfit it is necessary to employ two men 

 to operate the nozzles, an engineer to look after the machine, and a 

 team and driver. A driver with a horse and wagon accompanies 

 each sprayer with a supply of poison, gasoline, extra hose, etc. 

 The driver of the supply wagon is required to post warning notices 

 in the treated strips, which indicate that spraying has been done, so 

 that owners of cows and other animals will not permit them to feed 

 on the sprayed foliage or grass. 



Under favorable circumstances from 4,000 to 5,000 gallons is 

 sprayed out in 8 hours, but this amount is sometimes reduced by 

 each machine, owing to pump or engine troubles. 



