EXPERIMENT STATION BULLETINS. 



303 



and part of the thorax, which are brown The pupal stage is passed in the 

 mines of the leaves, necessarily on the ground in the winter time. The adult 

 which comes from the pujia is a dainty, purplish moth with occasional yellow 

 scales. It is so small that it measures only aiwut a quarter of an inch from 

 tip to tip of the extended wings. The effect produced by many of these mines 

 is merely equivalent to removing some of the foliage, but unfortunately this 

 insect sometimes takes to blackberry foliage, there doing severe injury. See 

 blackberry insects. 



Fig. 21. — Apple Leaf-miner, work on apple leaf. Author's illustration. 



REilKDIES. 



The fact that the pupal stage is passed in the mines, plainly indicates that 

 when the insect is present, the leaves should be gathered and destroyed in the 

 fall. No spray can be used with benefit as the young are protected by the skin 

 of the leaf under which they burrow. 



