72 



MASS. EXPERIMENT STATION BULLETIN 353 



and northeastern New York there is only one generation a year. As the insect 

 sprcad.s farther south, however, there is the possibility that two or more genera- 

 tions may be produced in those regions. 



Control. For ornamental trees a spra\' of 40 percent nicotine sulfate, 1 pint 

 to 100 gallons of water plus 4 pounds of laundry soap, is recommended to control 

 this insect. Spraying should be done on warm days but not on hot, sultry days 

 when water scald might result. This spray should be applied to the foliage after 

 practically all the eggs have been deposited but before many of the largest leaf 

 mines reach a diameter of J4 to 3/8 inch. Later the larvae are more resistant to 

 the spray and are not so easily killed. 



Bordeaux mixture is reported to be an effective repellent if applied just as the 

 adults begin to appear. A second application should be made 2 weeks later. 



Brower, A. E. Jour. Econ. Ent. 26(3) :732. 1933. 



Brower, A. E. Jour. Econ. Ent. 27(2) :342-344. 1934. 



Craighead, F. C, and Middleton, W. U. S. Dept. Agr. Misc. Pub. 74:23. 1930. 



Friend, R. B. Conn. Agr. Exp. Sta. Bui. 348:330. 1933. 



Glasgow. R. D. Jour. Econ. Ent. 25(3) :693-695. 1932. 



Peirson, H. B. Jour. Econ. Ent. 22(3) :588-594. 1929. 



Peirson, H. B., Taylor, R. L., and Wilkins, A. H. Maine Forest Service Circ. 1. 1930. 



Ehn Leaf Miner 



Kaliosysphinga ulmi Lund. 



The elm leaf miner is native to Europe. It is supposed to have entered this 

 country prior to 1898, and now is commonly found throughout northeastern 

 United States. 



Leaf of Camperdown Elm Mined by Larvae of the Elm Leaf Miner. 



