MAINE AGRICULTURAL EXPERIMENT STATION. 191O. 369 



In about twenty days from the spinning of the cocoon the 

 pupal skin spHts and the moth emerges (fig. 40, a), lays its 

 eggs, and gives rise to another generation. 



MEASURES USED AGAINST THE CODLING MOTH. 



An arsenical spray (Formula 6) immediately after the blos- 

 soms have fallen should be used and repeated 7 to 10 days 

 later. Use burlap bands on trunks, killing all insects under 

 them every 10 days from July i to August 15, and once later 

 before winter. 



3. Apple Maggot or Railroad Worm. 



(Rhagoletis pomonella.) 



The adult stage of the apple maggot is a fly, a little smaller 

 than the house-fly and readily distinguished by four dark 

 irregular bands across the wings ; these are found in the apple 

 orchards from about July first until frost. During this time 

 the females are employed laying eggs, by piercing the skin of 

 the apple with a sting-like ovipositor and leaving at each in- 

 cision one tgg buried in the pulp. Each female is capable of 

 laying at least three or four hundred eggs. 



From these eggs hatch apple maggots which tunnel through 

 the pulp where they feed until full grown. The maggots are 

 small, plump, white objects without legs and' with head so ill 

 defined that it is difficult to find it at all. The mouth parts are 

 reduced to a pair of rasping hooks. The apple maggot works 

 in soft discolored mushy trails anywhere in the pulp. The trails 

 of the apple maggot never contain little round sawdust-like 

 pellets. Often their tunnels lie directly beneath the skin of the 

 apple, showing through in the light colored varieties as dark 

 ti ailing tracks which have won for the apple maggot the pop- 

 ular name of Railroad Worm (fig. 44). But, though the mag- 

 got frequently comes near the surface of the apple, it never 

 breaks through the skin until it is through feeding and is thus 

 always protected, a circumstance which shozvs clearly that it is 

 of no use to try to destroy this pest by spraying. 



When the eggs are laid, the apples are young and hard and 

 for some time the maggots grow very slowly. At this stage 

 the tunnels are very inconspicuous and the maggots themselves 



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