520 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



From the above figures it will be noted that 41 per cent of the larvae 

 voluntarily cocooned within the traps. This percentage far surpassed 

 expectations. It will be further noted, by a study of the table, that 

 the number of insects caught by the traps sometimes exceeded the 

 number found beneath the bands; also, that the comparative number 

 of insects within the trap and beneath the band on the same tree would 

 occasionally alternate with the different observations. Improve- 

 ments with the traps have recently been made, but not perfected, 

 which may induce a still higher percentage of the larvse to enter the 

 traps in preference to the cloth bands. 



As further evidence of the value of the traps the following data are 

 offered: Two traps placed July 1 on trees within the same orchard 

 were removed July 28. The total number of insects trapped in- 

 cluding larvae, pupae and moths was 98 — of this number 12 were in 

 the adult stage, 11 of which were dead. Another trap placed July 5 

 and examined July 28 showed a capture of 43 larvae and pupae. Thus, 

 in less than a month, three traps captured 141 insects in an orchard 

 which had already been sprayed four times. Assuming that about one 

 half of these were females, and that each would lay 50 eggs, it will be 

 seen that the infestation on three trees has at once been reduced by 

 3,500 larvae. 



Some Advantages of the Trap 



The cost of the wire cloth is insignifica,nt when compared with the 

 service rendered. Current wholesale prices average about $1.40 per 

 hundred square feet. The wire cloth for bearing trees will therefore 

 cost about 1^ to 2 cents per trap depending upon size. In addition 

 to this something must be allowed for making and attaching, but this 

 can well be done during the winter months. 



Once the traps are properly applied, they should require little or no 

 attention except at the beginning of each year. The gradual increase 

 in the size of the tree and the elasticity of the wire screen should serve 

 to hold the trap snugly in place. The durability of the traps has not 

 been tested but they will doubtless not need renewal more than once 

 every two to three years. 



The use of the traps will eliminate the overlooking of larvae and 

 pupae which frequently happens when the bands are used. Likewise, 

 no moths will' escape from the traps, as is commonly the case with the 

 bands, because the fruit-grower, due to the pressure of other duties, 

 was unable to "work the bauds" on time. 



One of the desirable features of the trap is that it will serve as a 

 guide for timing the spray applications. By observing the time of 

 emergence of the spring brood moths, the fruit-grower can figure ap- 

 proximately when the first cover spray for the fruit should be applied. 



