CoRNELiv University, Ithaca, Nov. 15, 1898. 



Honorable Commissioner of Agriculture, Albany. 



Sir : — In 1897, careful experiments were made by H. P. Gould 

 upon methods of treating the San Jose scale in summer time, and 

 the results were published in Bulletin 144 (January, 1898). It 

 was found that a mechanical mixture of kerosene and water, i 

 part of the oil to 4 parts of water, will kill the scale and not 

 injure foliage of the plants with which we have experimented. 

 In 1898, Mr. Gould continued the experiments, and the results, 

 published herewith, confirm the conclusions of last year. The 

 oil and water are mixed automatically by an attachment to the 

 pump (see picture on title.) We are now convinced that val 

 uable plants can be saved from an attack of the San Jose scale 

 by summer treatment. However, we believe that the effort to 

 save plants should be allowed only on stock which is per- 

 manently planted in the grounds of responsible parties, and 

 not on stock which is to be sold. 



These experiments have been made under the direction and 

 supervision of Professor Bailey. Mr. Gould is now one of the 

 State inspectors of nursery stock. 



The report is now submitted for publication as a bulletin under 

 Cliapter 67 of the Laws of 1898. 



I. P. Roberts, 



Director. 



