796 CONNECTICUT EXPERIMENT STATION REPORT, I907-I908. 



Bordeaux mixture), or with Paris green (one-half pound in 

 fifty gallons) . Shade and garden trees may be cared for by plac- 

 ing a band of sticky material, one of the best substances being 

 "tree tanglefoot," about the trunk. This can be placed on the 

 bark, or preferably a band of cotton batting should be placed 

 around the trunk covered with a strip of tarred paper five inches 

 wide, upon which the sticky material is placed. Banding is 

 inexpensive and effective where the bands are properly cared for. 



Where the fall canker worm is the destructive species, the bands 

 should be applied during October, and kept in a sticky condition 

 during November and December and again during March, April 

 and May, in order to prevent both the adult female and the newly 

 hatched caterpillars from ascending the trees. To control the 

 spring canker worm, the sticky bands need be effective only dur- 

 ing March, April and May. 



FURTHER TESTS OF GASES TO DESTROY SAN JOSE 

 SCALE ON NURSERY STOCK. 



In the Report of this station for 1907, page 270, is an account 

 of the value of various gases for fumigating nursery stock to 

 destroy the San Jose scale. It was stated therein that the tests 

 were preliminary and that conclusions based on them were 

 scarcely warranted, yet that they indicated the desirability of 

 making further tests with smaller quantities of carbon disulphide 

 and carbon tetrachloride, and of longer fumigating periods with 

 the former. Following along this line, therefore, the present 

 paper deals with additional tests made during the last week of 

 April, 1908. All trees were apple, and more or less infested with 

 the scale, much more so than the trees used in the tests last year. 

 This fact may in some measure explain the results, as it is 

 probable that where trees are slightly infested a careful fumiga- 

 tion will often kill all of the scales, whereas with the same treat- 

 ment the gas might not be able to reach and destroy every indi- 

 vidual insect where the bark is thickly covered by them. 



The work of fumigating and counting the scales was done by 

 Mr. B. H. Walden. 



The roots were in good condition, except where otherwise noted, 

 and the buds had started but little. Portions of the trunk were 



