74 



X. H. AGE. EXPERIMENT STATION, 



[BuUetin 171 



Table 20. 



Infiuence of Time of Dropping on Total Number of Larvoe Issuing. 

 Number of Larvae per 1,000 Drops — during entire period after apple falls. 



Early Harvest Date dropped Aug. 9 

 Larva per M 1561 



Red.^stracban Date dropped July 30 

 Larva per M 1,512 



August Sweet Date dropped July 30 

 Xarvse per M 12,438 



Sops-of-Wine. Date dropped July 30 

 Larvse per M 3,093 



Porter Date dropped Aug. 22 



Larvae per M 2,010 



Gravenstein . Date dropped Aug. 10 

 Larvae per M 1,737 



Jersey Sweet | Date dropped Aug. 14 

 Larvae per M 8,905 



Russet Sweet. Date dropped Aug. 18 

 Xarvae per M 225 



West field. 



] Date dropped Aug. 26 

 I Larva per M 1,579 



Winter Sweet Date dropped July 31 

 ILarvaeperM i 110 



Aug. 11 

 1,891 



Aug. 6 

 759 



Aug. 6 

 7,756 



Aug. 13 Aug. 16 Aug. 20 Aug. 22 

 1,657 176 I 315 229 



Aug. 13 Aug. 20 Aug. 21 

 4,438 I 3,244 1 1,444 



Aug. 2 Aug. 6 Aug. 13 Aug. 15 

 7,053 8,115 3,164 2,864 



Aug. 30 

 1,395 



Sept. 5 Sept. 12, 

 1,922 , 1,085 



Aug. 17 Aug. 24 Sept. 1 

 1,831 1.067 ! 390 : 



Aug. 16 Aug. 22 Aug. 29'Sept. 4;Sept. 10 Sept. 14 

 9,760 ; 7,015 3,060 7,062 4,158 i 2.932 



Aug. 25|Sept. 1 Sept. 8 Sept. 15 Sept. 22 Sept.29'Oct. 6 Oct. 11 



1,245 



Sept. 2 

 2,437 



Aug. 6 

 150 



909 I 1,196 



737 



622 



23 



47 



Sept. 9Sept.l6|Sept.23iSept.30Oct. 7lOct. 14, Oct. 22 

 2.388 2.023 1.434 I 1,018 162 i 9 1 71 



Aug. 14 

 250 



Aug. 19 Aug. 25 Sept. 4, Sept. 10 Sept. 14 Sept. 25 

 1,058 760 436 i 340 260 31 



Oct. 1 Oct. 8 



18 



INFLUENCE OF VARIETY ON RATE OF EXIT OF LARViE. 



It is clear that the varietj^ of apple, as indicating its season 

 of ripening and characteristics of flesh, is of vital infiuence on 

 the time required for the larvte to mature and issue from the 

 drops. 



If the fruit is of an extreme early type, growing mellow on the 

 tree and dropping in midsummer, exit of the larvae begins quickly 

 and proceeds rapidly. A fourth of the larvae may issue by the 

 close of the first week. Taking Early Harvest as a type of this 

 extreme, the issuance from drops in 1910 in the first week after 

 the apple fell amounted to 27.4 per cent of the total. Exit of 

 larvae came to an end after drops had been off the tree four weeks. 

 The maximum issuance occurred the third week. 



A slightly increased firmness of pulp, even in early fruit, results 

 in a much less rapid rate of issuance the first week. Thus with 

 Red Astrachan, August Sweet and Sops-of-Wine in 1910, 4.2 per 

 cent, 2.5 per cent and 1 per cent, respectively, of the total larvae 

 issued the first week. The period required for exit of all larvae was 

 about four weeks. The maximum was reached the third week. 



