64 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



have been found in a single calyx. The question whether larvae migrate 

 from one point to another is very interesting. Under extremely 

 wormj^ conditions in the West as high as forty-two eggs have been 

 found around each apple on an average tree. Under such conditions 

 the finding of a larva in the calyx would not prove that it came from 

 a "blind." 



Mr. E. p. Felt: Doctor Ball asked me to explain. May I ask 

 him to explain? If these are "deadheads" in a certain sense, why is 

 it that we should have substantially the same percentage on our check 

 trees as on our sprayed trees, — trees that have had no poison? I 

 cannot get over that. 



Mr. E. D. Ball: I saw that point at the time and cannot get over 

 it either. This habit of the larva of coming out and exposing itself on 

 the surface of the apple a second time is also hard to reconcile. We 

 thought we taught it better than that. 



Mr. E. H. Siegler: In connection with the control of the cod- 

 ling moth, I have been asked to make a few additional remarks 

 upon the paper entitled "A Codling Moth Trap" which appeared 

 in the last issue of the Journal of Economic Entomology. I 

 have brought along the same illustrations which are shown in the 

 Journal and also have a small model which I shall pass around for 

 your inspection. 



As you will note, the trap consists of a strip of burlap folded to three 

 thicknesses and sufficiently long so as to encircle the trunk of the tree. 

 The burlap is then covered with wire screen, twelve meshes to the 

 inch, and is securely attached to the tree trunk. The principle of the 

 trap is founded upon the fact that the codling moth larva can enter a 

 smaller opening than through which the moth can escape. The larva 

 enters the trap through one of the openings of the wire screen and spins 

 its cocoon beneath the burlap. Finally, the moth upon emerging is 

 trapped beneath the wire screen. 



It is a well known fact that many codling moth larvae may be 

 captured beneath cloth bands attached to the trunk of the tree and this 

 method has been employed more or less for many years. However, 

 the labor involved in examining the bands so as to destroy the larvae 

 beneath has greatly limited this practice. With these facts in mind, 

 it therefore seemed of prime importance to ascertain whether or not 

 the codling moth trap would prove as attractive a cocooning place 

 for the larvae as the usual cloth band. In order to secure this data, 

 twelve trees in a commercial orchard were selected and around the 

 trunk of each a burlap band was placed. A strip of wire screen 

 was then attached to the trunk so as to cover the burlap half way 

 around the trunk. It will thus be seen, that by this arrangement, 



