718 AMERICAN FORESTRY 



Spray for leaf -eating insects. The necessary apparatus and arsenate of lead, 

 the standard material, should be held in readiness and the spraying should be 

 done after due consideration of the habits of the particular insect in question. 

 Information on the habits of any particular insect pest and definite instructions 

 as to time and methods of spraying can be obtained from the local State Agricul- 

 tural Experiment Station or from the United States Department of Agriculture. 



Most leaf-eating insects commence defoliation at the end of May. The elm- 

 leaf beetle, in the vicinity of New York City, starts feeding on about the fifteenth 

 of May. In combating leaf-eating insects use arsenate of lead, of a recognized 

 brand, at the rate of 1 pound to 10 gallons of water. Make the application to the 

 under side of the leaves as soon as feeding begins or a few days before if that can 

 be anticipated. 



Hickory trees infested with the hickory bark borer should be removed and 

 destroyed at once because the beetles emerge from the infested trees in early 

 June and soon after proceed to other neighboring hickory trees where they deposit 

 their eggs in the outer sap wood. In the vicinity of New York City, including 

 all of Long Island, parts of New Jersey and Westchester County, nearly all the 

 hickories are badly infested with this pest. 



The presence of the insect can be detected by the small holes in the bark of 

 the trees and the fine sawdust which is ejected from these holes, when the insects 

 are active. It is important to emphasize the advisability of detecting the fine 

 sawdust because that is the best indication of the actual operations of the hickory 

 bark borer. These holes, however, will not be noticeable until the insect has 

 completed its transformation. In summer, the infested trees show wilted leaves 

 and many dead twigs. Holes in the base of the petioles of these leaves are also 

 signs of the working of the insect. Since the insect works underneath the bark, 

 it is inaccessible for treatment and all infested trees should be cut down and burned, 

 or the bark removed and the insects destroyed. This should be done before the 

 beetles emerge from the tree in June. 



Spray for certain sucking insects. Such species of sucking insects as the 

 oyster shell scale hatch their eggs at this time and can be most successfully com- 

 bated when the young commence to crawl. There are several oil emulsions in the 

 market suitable against these insects but their use is dangerous without specific 

 instructions as to strength, time of application and the kind of tree to be applied on. 



In almost every group of trees one will find a few that show at this season, 

 a number of branches which have died off during the winter. These dead branches 

 can be removed now as well as later. In removing these branches the cuts should 

 be made close and the resulting wounds should be covered with coal tar. 



[Requests for advice or information from this department should be addressed 

 to Editor, American Forestry, Washington, D. C. They will be given prompt 

 attention.] 



Change in Address. 



Members of the American Forestry Association are requested to send 

 notification of any change in address so that the American Forestry 

 Magazine and other mail will not be delayed in reaching them. 



Such notices are desired before the 25th of each month so that the address 

 may be changed for the monthly mailing of the magazine. 



