140 MAINE AGRICULTURAL EXPERIMENT STATION. 



development is slower in late and in hard fruits. A dozen mag- 

 gots may infest the same apple, though a single one is enough 

 to render it worthless. The maggots have been found in 

 numerous varieties, early and late; sweet, acid, and sub-acid, 

 extending from early in July through August, September, Octo- 

 ber, November, December, January and February. The larvse 

 usually leave the apples and go into the ground an inch or less 

 and soon change to the pupa state. The pupae are occasionally 

 found within the fruit in windfalls and quite frequently in stored 

 fruit. Sometimes the larvae change on the surface of the 

 ground, under decaying fruit. On grass ground they probably 

 change in the debris about grass roots. 



Remedies. 



The Trypeta is an unusually hard insect to destroy, since the 

 eggs are laid under the skin of apples ; the larvse spend their time 

 within the fruit ; the pupae are safely concealed in the ground, 

 within the shrunken skTns of the larvse; thus in all forms it is 

 immune from the attacks of parasites. The flies do not seem to be 

 attracted by sweetened poisonous substances and cannot be 

 trapped. The eggs are so safely lodged underneath the skin of 

 the apple as to be beyond the reach of poison applied by spraying, 

 hence there is no hope in that direction. The only chance left is 

 to destroy the larvse and pupse. This can best be done by destroy- 

 ing the fruit within which they are contained. The larvse are 

 found abundantly in windfalls and in decayed fruit from the cel- 

 lars, and the pup^ in bins and barrels where fruit has been stored. 

 Destroying the windfalls, and all refuse fruit, and burning the 

 rubbish from places where fruit is stored are, then, the only 

 reasonable and practicable methods of treatment now recognized. 



