THE APPLE LEAF-MINER. 
PN EVV tote bOmer rh vA PPLE: 
BYECesD sey ARVIS: 
SUMMARY. 
A small insect known as the Apple Leaf-Miner appeared in 
unusually large numbers during the past season. Although 
the insect has been known for about half a century and has 
become well distributed over the eastern part of the United 
States and Canada, it has never been regarded as a serious pest’ 
until last year, when it was reported as doing serious injury 
in Vermont. } 
This year many partially defoliated trees have been observed 
_as a result of this pest. 
The insect makes a mine in the leaf, which appears on the 
upper surface as a large, brownish patch. If many mines oc- 
cur on the leaf, it will roll up and its functions cease. 
Two broods occur in a season. The second is the more 
serious. The insect spends the winter as a caterpillar within 
the mine. 
Certain parasites are doing efficient work in controlling this 
pest. Unfavorable weather conditions also contribute to its 
destruction. 
As the insect feeds internally, it cannot be reached by in- 
secticides. The only means at our disposal is to gather up and 
destroy the infested leaves, or plow them under. The latter 
operation is recommended for the reason that many other in- 
jurious species would be destroyed at the same time. 
