THE MICROSCOPE 



AUGUST, 1S96. 



Number 44 



New Series 



Objects Seen Under The Microscope 



BY CHRYSANTHEMUM. 



XXXIII. — Trypeta Pomonella or Apple Maggot. 



One of the most troublesome apple pests and one which 

 is increasing every year is the apple maggot, commonly 

 known as the railroad worm. The parents are two- 

 winged flies (figs. A B) which remain in the ground in a 

 pupa state (fig. D) during the winter, emerge in June or 

 July according to the climate and are on the wing until 



^^ ^^7^ 



September or October, or until the early frosts check 

 them. 



If some of them are captured, by confining them in a 

 gauze bag placed over a branch of the tree, it will be of 

 interest to watch them. The female (fig. A) will com- 

 mence to lay her eggs in the half grown fruit by punc- 

 turing the skin with her ovipositor and inserting the 

 eggs vertically into the pulp of the apple with the end 

 which contains the head pointed toward the core. The 



