30 MAINE AGRICULTURAI, EXPERIMENT STATION. I9I3. 



"We used 3 lbs. of paste arsenate of lead the first time over the trees 

 and 3 1-2 lbs. to 50 gallons of water the second time. 



"A careful and detailed record of the actual cost of spraying 435 trees 

 was kept. Most of these trees were large and all of them stood near 

 the street and near our water supply. It cost $133.37 to spray these trees 

 once or 30.7c per tree. On the average each machine sprayed 36 1-4 

 trees per day of eight hours, or 4 1-2 trees per hour or a tree about every 

 13 1-3 minutes. On an average we used approximately 18 1-6 gallons 

 of liquid to each tree. 



"A detailed example of a day's work on the largest trees will give 

 even a better idea of the cost of spraying stich trees. On June 19th the 

 two machines began on the largest elms on the Campus, namely those 

 from the Library south along each side of Central Avenue. The two 

 machines sprayed 59 of these very large trees. The cost of the men 

 and teams were $17.00, the arsenate of lead $6.61 1-2, the gasoline 35c, 

 total $23.96 1-2, which is an average of 40.6c per tree. 



"In all, there are about 530 trees on the University Grounds that were 

 sprayed. About 100 of these were scattered over the steep hillsides west 

 of the buildings and along University and Stewart Avenues. Many of 

 these trees were a mile from our water .supply and the majority were 

 scattered and not easy to reach. It cost, exclusive of permanent equip- 

 ment, $464.90 to spray these trees twice or an average of approximately 

 88c. each. The scattered trees just mentioned raised the average cost of 

 the whole, quite materially. If all of the trees had stood along streets 

 and reasonably near a water supply the average cost would have fallen 

 I think, below 70c. It took the two machines ten days to make the first 

 spraying and eleven days to make the second. The second spraying was 

 done more thoroughly and there was much more leaf surface to cover. 

 On the other hand, experience had made the men more efficient." 



As will be seen the outfits mentioned in the above account 

 are quite similar to those usually used in the spraying of apple 

 orchards which may be purchased, complete with tanks, hose, 

 rods, etc., for from 300 to 400 dollars each. In localities where 

 orchard spraying is practiced it would therefore be a very sim- 

 ple matter to hire an equipment with experienced men to run it. 



