80 



N. H. AGR. EXPERIMENT STATION. 



[BuUetin 171 



EXIT OF LARV.ffi BY DAY COMPARED WITH NIGHT. 



In experiments in 1910 more larvae issued from apples during 

 the hours of 6 p. m. to 6 a. m. than issued in the other half of the 

 twenty-four hours. The difference was marked. Table 22 

 summarizes the results. 



Table 22. 

 Exit of Larvae in Daytime Compared with Night. 



Total time, night, 75 hrs. Total larvaj, 252. 

 Total larvae, 29. 



Ratio, night issuance to day issuance, 4.2 to 1. 



Total time, day, 36 hrs. 



Total time, night, 249 hrs. Total larvae, 396. Total time, day, 255 hrs. 

 Total larvae, 144. 



Ratio, night issuance to day issuance, 2.8 to 1. 



