MAGGOTS TUNNELING WITHIN THE FRUIT 343 
or Paris green to poison the beetles when they appear in the spring. 
Since they feed freely on the leaves, the majority of them will be killed 
by an application of poison at this time. 
The Apple Maggot (Rhagoletis pomonella Walsh) 
In the northeastern states early or sweet apples, or sometimes late 
fruit, are often infested with the so-called “ railroad worm,” a small, 
whitish maggot which tunnels here and there through the pulp of the 
Fic. 539.—Section through apple, showing charac- 
teristic work of the Apple Maggot. Original. 
apple as it ripens, making a small, brown track wherever it goes. In 
thin-skinned varieties, these tunnels are apt to show through from the 
outside as wandering, brown tracks. This insect must clearly be dis- 
tinguished from the common “ apple worm ” or codling moth, which 
eats preferably in and around the core and gnaws a large and con- 
spicuous hole to the surface. 
A two-winged fly, with oblique-banded wings, is the parent of the rail- 
road worm. It appears in July, and lays its eggs, one at a time, under- 
