220 MAINE STATE COLLEGE 



the female, after the manuerof the eggs of the barn-yard fowl, the 

 season of egg laying extends over considerable time. The eggs are 

 vertically inserted into the pulp of the apple, with the end opposite 

 the pedicel, which contains the head of the maggot, pointing toward 

 the core. The eggs are deposited in all parts of the apple, usually 

 upon the cheeks, sparingly near the calyx and stem ends, and more 

 abundantly upon the pale or shaded side of the fruit. The time 

 required to deposit the eggs is about one-half minute. By means of 

 the sharp ovipositor a characteristic puncture, .33 mm. (.0133 in.) 

 diameter, is made through the skin of the apple. These punctures 

 can be detected by careful ob^ervatiois with the naked eye, but a 

 pocket lens is necessary to see them well. They appear as brownish 

 specks, and have not been before distinguished from the brownish, 

 rusty spots common on apples. Under the glass they appear as 

 circular or oblong openings, surrounded by a brownish border, 

 somewhat shrunken by the shriveling of the tissue beneath. They 

 may be numerous on the same apple. The eggs hatch in four or 

 five days under favorable conditions and the minute larvae begin at 

 once to work in the pulp of the apple. They have no true opposable 

 jaws, but the head is provided with two black curved hooks, situated 

 above the mouth, with which they rasp the pulp of the fruit rapidly 

 by means of a vertical movement of the head. They live upon the 

 juice of the particles of apple thus detached which is sucked into 

 the mouth. The pulp is rejected and turns brown. They can 

 burrow their length in soft fruit in less than a minute. The 

 channels made by the young larvae, while the fruit is still growing, 

 are largely healed and neither they nor the minute white larvae are 

 liable to be detected by the naked eye or by the casual observer. 

 As the larvae grow and the fruit matuies, the enlarged channels do 

 not heal, but turn brown and the presence of the maggots is then 

 readily detected. These channels meander through the Avhole 

 fruit even the core. They often cross each other, enlarge as the 

 larvae grow, and in the last 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 peel. 



In the early stages of Trypeta work there is no external evidence 

 that the fruit is infested, excepting the punctures made for the 

 insertion of the eggs. By these punctures the presence of the 

 maggots can be detected. In advanced Trypeta work, brownish 

 trails, where the larvae have come to the surface, can be seen 



