those of the New York study. The degree of 

 larval t unn eling averaged over all infestation 

 dates and storage conditions was about the 

 same for Mcintosh and Delicious. For both 

 cultivars, average tunnel length increased 

 somewhat from the earliest egg infestation date 

 (July 18) to mid-season egg infestation dates 

 (August 2 and August 8). For the latest egg 

 infestation date (August 22), average tunnel 

 length was slightly less than at mid-season 

 dates. Interestingly, the number of oviposition 

 stings in Mcintosh fruit caged with flies on 

 August 8, 15, or 22 was quite low in comparison 

 with numbers of stings earlier in the season. 

 Likewise, in the New York study, the number of 

 oviposition stings per Mcintosh apple was lower 

 in August than in July, even though the propor- 



tion of fruit yielding pupae was greater. 



Data from the first experiment (Table 1) 

 show that more larvae survived in Mcintosh 

 infested on August 20 than on July 22 of 1987; 

 whereas, data from the second experiment 

 (Table 1 ) show a greater level of larval tunneling 

 (indicative of greater larval survival) in Mcin- 

 tosh infested on July 26 then on August 22 of 

 1988. We have no good explanation for this 

 apparent discrepancy, although the few num- 

 bers of ovipositions on the August 22 infestation 

 date in the second experiment may be a contrib- 

 uting factor. 



In the second experiment, both Mcintosh 

 and Delicious apples examined immediately af- 

 ter harvest generally had less larval tunneling 

 than those kept in cold storage or at room 



Fruit Notes, Fall, 1991 



