APPLE INSECT OF MAINE. I39 



stages of Trypeta work, run together, producing large cavities. 

 Finally they involve the whole fruit, rendering it a worthless 

 mass of disgusting corruption, held together by the skin. 



In the early stages of Trypeta work there is no external evi- 

 dence that the fruit is infested, excepting the punctures made 

 for the insertion of the eggs. In advanced Trypeta work, 

 brownish trails, where the larvse have come to the surface, can 

 be seen through the skin. Apples marketed with no suspicion 

 of their being infested are frequently found hopelessly involved, 

 honeycombed and worthless. Apples apparently sound when 

 gathered may, by the presence of eggs or young larvae, after- 

 wards become worthless. The newly hatched larvae are a little 

 shorter than the egg and can not readily be detected in the white 

 pulp of the apple without a pocket lens. They attain their 

 growth, under favorable circumstances, in four or five weeks, 

 but their development may be arrested by cold, by insufficient 

 food, hardness of the fruit, etc., for a great length of time. 

 They ordinarily remain in the fruit but. a short time after they 

 mature, and often leave it and go into the pupa state while there 

 is still ah abundance of nourishment and the fruit is still occupied 

 by younger larvae of various ages. If the fruit is kept cold, 

 the larvae, though full grown, remain longer, or may even change 

 to the pupa state, within it. We have never seen the exit holes 

 in hanging fruit and believe the maggots do not drop, but go 

 into the ground from the fallen fruit. Their presence causes 

 the fruit to mature earlier. Fruit picked from the trees may 

 contain larvae, and often stored or marketed fruit is alive with 

 maggots. 



The exit openings are characteristic, irregular holes, about 

 one-twelfth inch in diameter, surrounded by a brownish border. 

 They look as though the maggots had gnawed a hole for the 

 head, and then forced the body through, leaving a lacerated 

 border. They may occur anywhere on the apple but are more 

 frequently found where the brown larval trails show through the 

 skin. They begin to appear in the early apples about the first 

 of August and may be found until frost, in windfalls, and in the 

 stored fruit as long as the lan-ae remain. 



It would seem that the development of the larvae is so nicely 

 timed that they are not mature until the fruit is ripe. Their 



