December, '16] 



SIEGLER: CODLING MOTH TRAP 



519 



to conform to irregular trees by means of a few tacks. The average 

 size of the codHng moth larvse, cocoons, pupa? and adults compared 

 with twelve mesh wire screen cloth is shown in Plate 38, figure 2. 



Field Experiments with the Trap 

 During the season of 1915, a few preliminary experiments were made 

 to test the principle upon which the trap was founded. Beyond prov- 

 ing that the device had potential value, nothing further of experi- 

 mental import was done. But during the present year, a series of 

 experiments has been inaugurated to determine the efficiency of the 

 trap. The preliminary experiments were, therefore, planned with 

 the view to discover how readily the larvae are lured into the trap. 

 To obtain such data, it was arranged to give the larvse the option of 

 entering the trap or beneath the ordinary cloth band. Naturally, it 

 might be well anticipated that the larvse would seek a place of refuge 

 along the lines of least resistance consistent with the assurance of 

 proper protection. The writer reasoned that if any of the larvae 

 should voluntarily select the trap in place of the band that the former 

 would not be considered an undesirable cocooning place. From this, 

 it was further deduced, that with nothing other than the trap on the 

 tree, that the larvse would then naturally be enticed into it. 



Eight trees in a sprayed orchard were selected and each of these 

 were finally banded with cloth half way around the trunk. At the 

 same time the corresponding half of the trees was covered with a trap. 

 Hence, all larvse seeking a place in which to spin up were free to choose 

 between the band and the trap. The following tabulated data give 

 the first results obtained: 



Experimental Results with the Codling Moth Thap, Grand Junction, Colo., 1916 



Insects captured include larvse and pupa. 



