Common where foodplant found.
When occurring in large numbers, entire trees can be damaged, the needles turning pale as the larvae eat them from within.
Leaf-mine: July to October, feeding again from April to May.
[MBGBI vol3, p282]
|Determination by Genitalia Examination (gen. det.) Required|
Recorded in 22 (32%) of 69 10k Squares.
First Recorded in 1874.
Last Recorded in 2019.