February, '17] entomologists' discussions 66 



the larvae leaving the fruit on each tree were free to spin up either 

 beneath the uncovered portion of the burlap or else to pass through 

 one of the meshes of the wire screen in order to cocoon in the burlap 

 beneath. Experiments of this nature were started upon two trees 

 July 1, upon two additional July 14, upon four trees July 17, and 

 upon four more August 22. Examinations were made July 5, 14, 

 17, 20, 28, and August 9, September 8, October 30. The total number 

 of insects captured upon these trees was 1,582 of which over 49 per cent 

 voluntarily entered the traps. Thus from the information at hand, it 

 would appear that the trap will entice approximately as many codling 

 moth larvae as will the ordinary cloth band. 



Another experiment included five trees, the trunk of each of which 

 was completely encircled by a codling moth trap. Three of these traps 

 were placed July 1, one July 5, and one on August 22. During the 

 period from their placement until October 30, 601 individuals, includ- 

 ing larvae, pupae and moths were captured. 



The information upon the codling moth trap is by no means com- 

 plete as yet, but the indications are that this device may be profitably 

 used, especially in regions where the codling moth is abundant. The 

 use of wire screen traps is not necessarily limited to the codling moth 

 but may be extended so as to include other insect pests. 



Mr. E. D. Ball: This seems to offer a possibilit}^ of great service in 

 the badly infested regions. There are one or two suggestions, how- 

 ever, that I should like to make. First, that it would be better to 

 put two or three strips up and down on a tree rather than a single 

 encircling one, for fear that this would be left on and kill the tree. 

 The second is that I was much pleased with the success Mr. Siegler 

 was having in rearing codling moth larvae in strips of corrugated board 

 and I am wondering if this would not be still better than burlap 

 in these trap bands. 



Mr. E. H. Siegler: That is a good suggestion. However, there is 

 greater likelihood of catching more larvae if the trap completely 

 encircles the trunk. There is, of course, no need of the trap until 

 the trees come into bearing, at which age the wire screen is scarcely 

 strong enough to cause girdling. As the trees grow older the possi- 

 bility of girdling is still further removed. 



I am inclined to prefer the burlap since it is more durable than the 

 corrugated pasteboard. There is no occasion to remove the burlap 

 band during the season, and it should therefore be of service for several 

 seasons. 



Mr. E. D. Ball: Where burlap is left out all winter most of the Unt 

 and short fibres are washed out and when a double fold of it is held 

 up to the face one can read a newspaper through it. Larvae will not 



