©14 Keport op Entomologists of the 



and 22d. Kerosene emulsion, 1 to 10, 15 plants, July 1st, 12tli 

 and 22d. 



It was found after the second application had been made that a 

 few male, but no female scales were alive on the plants treated with 

 the crude petroleum emulsion ; while on those treated with kerosene 

 emulsion enoug:h live male scales remained to give the impression 

 that not over 50 per cent, had been killed. The females were not 

 so plentiful. A third application of both washes was made to make 

 the test as complete as possible. 



Whether the male specimens issued from beneath the parent 

 scale after the second application, or are not as easily affected as the 

 female scales, is a question. The foliage was slightly injured by 

 the crude petroleum emulsion, but the plants retained the injured 

 leaves throughout the summer. When examined the latter part of 

 August no living specimens could be found on plants sprayed with 

 the crude petroleum emulsion. A good many of both males and 

 females had escaped the action of the kerosene emulsion. 



The above results show that the " Enonymus Scale " can be con- 

 trolled, and, if the work is thoroughly done can be exterminated by 

 three successive applications of crude petroleum emulsion. The 

 first application should be made about June 20th and the last July 

 20th. If the spraying should be left until July 20th and only one 

 application made, many of the young would be so well protected by 

 their scale they would not be destroyed. They could probably be 

 controlled by the use of kerosene emulsion, but four applications of 

 this between the 20th of June and July 20th would be required, as 

 it would not do to allow the young to become protected in the least 

 by a scale. 



The Oyster-shell Bark-louse can be controlled by the same washes, 

 but the treatment should be commenced about 15 days earlier. The 

 latter can be easily treated to advantage on some kinds of trees just 

 before the eggs hatch with either linseed oil or whale-oil soap. 



(c) Summary. 



With the exception of whale-oil soap none of the "winter 

 washes " have proven successful in the tests made by the United 

 States Division of Entomology. It was also proven by these tests 

 that none of the washes were as effective when applied in winter 



