12 BULLETIN 480, U. S. DEPARTMENT OF AGRICULTURE. 



find considerable variation in the cost of applying the mist spray, 

 either with gasoline or hand outfits, it is more than double the cost 

 of solid-stream spraying, which, in the long run of the season's 

 work, will equal an amount that will more than two-thirds pay for a 

 high-grade solid-stream machine and equipment. By following the 

 mist method for two seasons a high-grade outfit has practically been 

 thrown away and with no asset shown for money expended. 



WOODLAND SPRAYING. 



In woodland or park spraying the solid-stream method is in a class 

 by itself, as the climbing of trees over large areas makes the mist 

 method not only too slow but laborious and expensive. With a high- 

 grade solid-stream machine properly equipped an average of froin 12 

 to 15 acres can be sprayed in a day. This applies to large areas 

 where machines can be operated without the necessity of moving any 

 great distance in the day's work. Twenty-one acres of woodland, 

 consisting mostly of trees 60 to 70 feet high, is the maximum treated 

 in a single day. (PL XIV.) In this instance the water supply was 

 convenient and easily accessible. The solid -stream machine for wood- 

 land spraying should be equipped with from 1,000 to 1,500 feet of 

 1-inch hose; 100 feet of 2|-inch suction hose, suction strainer, two noz- 

 zles (one long and one short), and with each nozzle one of the fol- 

 lowing tips : T 5 s, J, fV, i inch bores. The nozzles should be equipped 

 with a brass spreader for spraying undergrowth and low foliage. 

 (PI. XV.) Hose should be provided with couplings that will not 

 blow out if expensive delays are to be avoided. Spraying in wood- 

 land should be arranged so that whenever possible the location of 

 the hose may be changed while the sprayer is being filled. Much 

 time will be lost if this is not done, and 10 men are usually necessary 

 where long lines of hose are being used. 



Men should be so located on hose lines that the nozzlemen will not 

 be hindered by the weight of hose. The number of men needed in 

 woodland spraying is determined entirely by the lengths of hose 

 used. One hundred feet of 1-inch 8-ply cotton-covered hose weighs 

 84 pounds, and carries 4.8 gallons of water weighing 32.64 pounds, 

 making the total weight when spraying 116.64 pounds. This makes 

 it necessary to assign a man to every 100 feet, besides the nozzleman. 

 The cost of woodland spraying where large areas are involved aver- 

 ages about $5.50 per acre. Where only small areas are sprayed the 

 cost is much greater. Six hundred gallons of solution, when prop- 

 erly Applied, will usually spray an acre and no climbing should be 

 necessary. In experiments recently conducted, a pine tree 99J feet 

 high was successfully sprayed from the ground. Good results can 

 usually be obtained in woodland spraying by directing the stream 

 through the open places in the foliage in order to minimize damage 



