64 



ASSOCIATION OF ECONOMIC ENTOMOLOGISTS. 



Examining to see where the worms were killed we found that 

 there was little difference in the percentage killed in the calyx and 

 side. Wherever the largest number of worms were, there the per- 

 centage killed was the highest. 



THE RELATIVE VALUE OF EARLY AND LATE SPRAYINGS. 



(Fig. 3.) 



The entire value of the late sprayings can be measured by the num- 

 ber of worms killed in the second brood, and is easily obtained from 

 the above tables. In the case of the early sprayings the problem is 

 much more complex. A certain number are killed in the first brood, 



< 

 O 



K'vUei wkfc (Uowe 

 Kilted (oVVoWvu^ Ew\\j ones 



K\ttel*P Bto'Qd 

 K\VVefcu2?tao4 



IS. Ptei/etviei 



Killed CqVVomAcv^ ta\V\j ones 



Fig. 3. — Chart to illustrate relative value of early and late sprayings for the codling 



moth. 



still more in the second, but by killing the worms in the first brood a 

 larger number are prevented from appearing in the second. This 

 latter factor is no doubt variable, and up to the present time no 

 method has been devised by which the ratio of increase can be accu- 

 rately determined. Estimating this increase at five times is doubtless 



