Report of the Entomologists. 541 



Experiment No. 2. 



Date the same as in Experiment No. 1. Six apple trees similar 

 to those in the above experiment were treated, the dendrolene 

 being applied on the trunks from the ground to the lower limbs. 



These were all the experiments made in the apple orchard. 

 In the first experiment the dendrolene was applied about one- 

 fourth of an inch thick, while in the second it was put on in a 

 very thin coating. 



Examinations made April 20 and 28 and at intervals from 

 a week to three weeks throughout the summer, showed that by 

 April 28 a very slight crust had formed on the dendrolene. This 

 was particularly noticeable where the dendrolene had been aj)- 

 plied in a thick layer. A week later ants varying from a small 

 red to a large black species were going back and forth over the 

 dendrolene without the slightest difficulty. At this same time, 

 however, large numbers of pistol-case-bearers which had been 

 feeding on the leaves of suckers near the trees, and which were 

 trying to crawl up the trunks of the trees, were found dead in 

 the bands of dendrolene. No canker-worm moths were found and 

 no large larvae. Two noctuid moths, however, of average size 

 were found dead in the dendrolene. ^ 



Experiment No. 3. 



In this experiment five eleven-year-old peach trees of the vari- 

 ety Early Rivers were treated. The application was made April 

 18, the dendrolene being applied about the lower part of 

 the trunk and at the crown of the root only.' The dendrolene was 

 put on with a trowel and was about an inch thick at the base 

 of the trunk. These trees were examined May 22. The den- 

 drolene was covered with a crust which would probably support 

 any insect of average size. Where the dendrolene had come in 

 contact with the soil it had become granular losing its sticky 

 character to a considerable extent. 



Experiment No. 4. 



In this experiment, the trunks of the trees were covered from 

 the ground to the lower limbs. The application was made on 



