AGRICULTURAL EXPERIMENT STATION. 203 



Arrested Development of Larv^. 



In the fall of 1888 a lot of apples which had been on exhibit at 

 the State Fair was received for examination. Though it was the 

 middle of September, the larvse were small and many of them dead. 

 We learned that some of the apples had been kept in cold storage 

 and all in cool places. We suspected arrested development. We 

 had come to believe from the examination of many apples, that 

 somehow the maturity of the larvse and the ripening of the variety 

 were somewhat coincident. Had noticed that the larvse grow much 

 faster as the fruit softens. To test the effect of cold storage, a 

 portion of a lot of Early Harvests collected July 9th, 1889, were 

 placed in an ordinary ice chest. The remainder of the same lot 

 was kept in a box under ordinary conditions. They were first 

 inspected August 10th, and the larvse from those kept under ordi- 

 nary conditions had emerged, and the pupse were found in the box. 

 None had emerged from those in the ice chest. Those in cold 

 storage were cut and examined from time to time, the last beinof 

 opened September loth, and the larvse were still in them. 



In 1888 we found larvse half grown November 6th. In 1889 Mr. 

 Briggs found a half grown larva December 1st. We found one 

 December 25th, half grown, in a King Tompkins. Mr. R. S. 

 Sweetser showed a larva at the Foraological Society meeting at 

 Norway, Febuary 4th, and sent the writer larvse about February 

 15th. If the eggs in these cases were laid at the time of killing 

 frosts, October 10th, then the eggs remained unhatchedlougerthan 

 the usual time, or the larv£e in some cases are from two to five 

 months reaching maturity. Cold seems to check development. 

 The larvse grow faster as the fruit softens. May not the occurrence 

 of Trypeta larvse in late winter fruit be from eggs laid late in the 

 fall, which from cold are tardily hatched and from the effects of 

 cold and the hard ttssue of winter apples are a long time in reach- 

 ing maturity ? May not cold storage arrest the work of Trypeta 

 larvse in fruit and prevent its rapid deterioration ? 



Are Trypeta Larv^ Found in Windfalls? 

 The examination of numerous specimens taken from the ground 

 has shown conclusively that the maggots are found abundantly in 

 windfalls. We have never seen exit holes in apples hanging on the 

 trees and believe that the maggots remain in the fruit until it drops 

 or is gathered. The presence of the maggots seems to hasten the 

 maturity and dropping of the fruit. Larvse are found abundantly 



