CONTROL OF Two ELM-TREE PESTS 501 



The trees on Cornell Heights in the city of Ithaca, New York, were 

 sprayed in 1912 by contract at 22 \ cents each. These trees, which are 

 not very large, range from 20 to 30 feet in height. Individual trees in 

 the city of Ithaca are sprayed, by contract for the season, at a cost ranging 

 from $i to $2 per tree, depending on size, distance from water supply, 

 and other conditions. It often becomes necessary, in the case of these 

 individual trees, to use special care in order to prevent the spraying 

 material from being sprinkled on the houses. Moreover, many of the trees 

 in Ithaca are very large, and all such trees must be climbed in order to 

 reach the top. 



Some figures showing the cost of spraying elm trees are given by Dr. E. 

 P. Felt. 1 He reports Dr. J. B. Smith as saying that the elms on the 

 college campus at New Brunswick, New Jersey, were sprayed at odd 

 times by the janitors. It took two men, with a force-pump and ladders, 

 about one hour to spray a single tree. Including the poison used, the 

 cost was about 56 cents per tree. In the city of New Brunswick the 

 trees were sprayed at a contract price of $i, it being understood that 

 they were to receive three treatments if necessary. 



Considerable data are given by Mr. Kirkland, 2 of Massachusetts, 

 on the cost of spraying trees, mostly woodland trees. In general the 

 cost is 20 to 45 cents each for spraying trees averaging 35 to 60 feet in 

 height. 



Doctor Felt states that the trees in Albany, which present a wide range 

 in size, were sprayed during the season of 1898 at the low cost of 15 cents 

 per tree. He reports later 3 that the trees in Lansingburg, New York, 

 were sprayed at a cost price to the contractor of about 23 cents, while 

 in Troy the same contractor charged 50 to 60 cents for individual trees 

 here and there throughout the city. 



In Albany the trees were sprayed in 1901 at an average cost of 22 cents 

 each when 5 pounds of Bowker's disparene to 100 gallons of water was 

 used. The average number of trees sprayed each day by each outfit 

 was forty. 



The city of Saratoga Springs sprayed its maple trees in 1900 at an 

 average cost of iyj cents per tree. These trees were sprayed for the 

 forest tent-caterpillar, and the spraying did not require so much time 

 and material as would have been needed for the elm leaf -beetle. 



PROPER TIME FOR SPRAYING 



The first spraying should be done just as soon as the leaves are three 

 fourths grown or larger, and as soon as the characteristic feeding-holes 



1 Bulletin 20, New York State Museum, 1898, p. 22. 



3 Third Annual Report of Superintendent for Suppressing the Gipsy and Brown-tail Moths, 1908, 

 pp. 140-159. 



3 Seventeenth Report New York State Entomologist, 1901, p. 739- 



