282 CONNECTICUT EXPERIMENT STATION REPORT, 1907-1908. 



of nursery stock, but at present we cannot do better than to use 

 hydrocyanic acid gas in the same way as has been recommended. 

 Care should be taken to do it properly, and the growth should 

 be well ripened if treated in the fall. 



It should also be noted that in many instances the apple trees 

 were fully as susceptible to injury from the gases as peach 

 trees. This is contrary to the belief of most nurserymen. 



SPRAYING TESTS WITH COMMERCIAL "SOLUBLE 

 OILS" TO KILL THE SAN JOSE SCALE. 



By W. E. Britton and B. H. Walden. 



Spraying tests with "soluble" or miscible oils were made on a 

 few trees in 1907. On account of gypsy moth work, which 

 required a large part of the funds at our disposal as well as 

 nearly all of our time, it was impossible to devote much atten- 

 tion to spraying experiments. However, over two hundred 

 young apple trees were treated with the three best-known com- 

 mercial "soluble" oils on the market, — "Scalecide," "Target 

 Brand Scale Destroyer," and "Kill-o-Scale." These substances 

 are similar in composition and method of application except that 

 Kill-o-Scale contains an addition of sulphur, while the others 

 do not. 



All the trees sprayed were apple trees except two Japan plums, 

 and were portions of the orchards of A. E. Plant of Branford 

 and E. M. Ives of Meriden. As the spring of 1907 was very 

 late, the buds did not open until about the first of May. At 

 Branford the spray was applied April 30th, and at Meriden, 

 May 1st. 



The tests show that all three products were about equally 

 effective when used in the proportions of one part to fifteen 

 parts of water. Very few scales survived the treatment in 

 any case. The following tables give the statistics regarding 

 these trials : 



In addition to the tests recorded in the tables, all of the fruit 

 trees on the station grounds were sprayed with "Scalecide," 

 one part to fifteen parts of water, in the fall of 1906. When 

 examined on March 29th very few living scales could be found. 

 Mr. Ives also sprayed nearly all of his orchard of several 



