SMITHSONIAN INSTITUTION LIBRARIES 



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earlier, before the eggs are all hatched, with seven parts of water, will effect the 

 destruction of practically all the eggs and larvae. Treatment at this time is 

 especially recommended on account of the fact that it coincides with the periods 

 for the first, or perhaps the second, application for the leaf blight of the pear, 

 and the kerosene emulsion and the Bordeaux mixture may he combined in one 

 application with little additional trouble or expense. The experiments already 

 conducted show the complete feasibility of this combination, which, briefly, 

 consists in using the Bordeaux mixture in lieu of water as a diluent for the 

 emulsion. 



A second treatment, which promises well, is the winter spraying for the hiber- 

 nating adults. A thorough wetting of the trunk and limbs at any time during 

 the winter with kerosene emulsion, diluted from seven to nine times, will reach 

 and destroy many of the insects. It will he more effective if the loose hark he 

 scraped from the trunk and larger limbs before the application is made. Any 

 of the other soapy or oily washes employed against the San Jose scale in winter 

 will be useful against this insect. 



The source and means of infestation reported for the Maryland orchards are 

 known to be paralleled in the New Jersey cases, and are probably true of the 

 Virginia one. They emphasize the advisability, as a precautionary measure, of 

 subjecting all nursery stock, procured either in fall or spring, to an immediate 

 and thorough spraying with kerosene emulsion. 



C. L. Marlatt, 

 First Assistant Entomologist. 



Approved: 



Chas. W. Dabney, Jr., 



Assistant Secretary. 



Washington, D. C, May 1, iS'.io. 



o 



