62 



N. H. AGR. EXPERIMENT STATION. 



[BuUetin 171 



if control measures are to be directed toward this phase of the 

 life cycle. For this reason a part of the investigation was ar- 

 ranged with a view toward securing considerable data on the 

 varying lengths of this period and the factors that may bring 

 about variations. 



An account of the manner in which the data were secured is 

 given below in the discussion of Experiments in 1910. The list 

 of varieties studied, together with the season of each, is given in 

 Table 7. The detailed record of larvse issuing will be found in 

 Tables 8 to 17. 



From the detailed records summaries have been made pre- 

 senting the data in various forms. These are given in Tables 18, 

 19 and 20. 



Table 7. 



Varieties Used in Secnring Records of Period hetween Fall of Apple and Exit 



of Larvce. 



Variety. 



Season of ripening. 



Season of maximum 



drops in 



experiments. 



Num- 

 ber of 

 drops 

 under 

 obser- 

 vation. 



Early Harvest 

 Red Astrachan 

 August Sweet 

 Sops-of-Wine . 



Porter 



Gravenstein . . 

 Jersey Sweet . 

 Russet Sweet . 

 West field. . . . 

 Winter Sweet . 



Late July to mid Aug. 



<< 



II 



. iLate July and Aug. 

 . I " " to Sept. 

 . Aug. and early Sept. 



.|Aug. to Oct 



. Sept. to Nov Early Aug. to mid-Sept. 



. iLate Sept. to Nov. .. " " " 



.iSept. toDec " " " 



. Sept. to Nov Mid-Aug. to mid-Oct. 



. Oct. to Sept. and Oct 



. Oct. to Sept. and Oct 



11 it II 

 11 II 



449 

 2,396 

 1,729 

 1,624 

 1,938 

 3,962 

 2,330 

 1,362 

 1,732 

 2,708 



Total 1 20,230 



