CONTROL OF CODLI^iTG MOTH IN COLORADO. 27 



worm infestation. Plat VI, which was given five applications of 

 arsenate of lead alone, produced 37.88 per cent of fruit free from 

 worms. It will thus be seen that in these experiments the addi- 

 tion of soap did not in all cases increase the percentage of worm- 

 free apples, nor did the codling-moth trap appear to have any dis- 

 tinct value. In plats IX and X the arsenate of lead strength was 

 reduced to one-half pound to 50 gallons, and, all factors being taken 

 into consideration, the results indicate that this strength is as effec- 

 tive as 1 pound to 50 gallons. The unsprayed plats XI and XII 

 produced 8.43 and 24.08 per cent of worm-free fruit, respectively. 

 The percentage of calyx entrants was somewhat higher in the 

 unsprayed than in the sprayed fruit, but the difference in this re- 

 spect is not so great as is usually found in spraying experiments for 

 the control of the codling moth. The unsprayed fruit was com- 

 paratively free from the codling-moth sting, which is in accord with the 

 experimental data obtained in the preceding years. 



