|Boxwood leafminer larvae||Close-up of Boxwood leafminer larvae|
|Winter||The partly grown larvae of the boxwood leafminer over-winter within their mines in the leaves of the host plant.|
|Spring||The larvae grow rapidly as the weather begins to warm. In late April, when weigela blooms, they turn into orange-colored pupae and emerge as a fly. After mating, the female inserts her eggs deep into the leaf tissue. She dies soon after and the eggs hatch approximately 3 weeks later, and the larvae commence feeding.|
|Summer||The larvae continue to feed and grow slowly. In Pennsylvania there is a single generation each year|
The larval feeding between the upper and lower leaves causes blistering and often discoloration.
from early larval feeding
||Raised areas caused by larval feeding|
|Cultural||Selection of the more resistant varieties.|
|Biological||Unfortunately, there are few known natural enemies of the boxwood leafminer.|
|Mechanical||Pruning the foliage before adult emergence or after egg laying ends will reduce the overall population|
Application of insecticide when the weigela is in bloom will
Katherine Mazzey, Penn State Extension Program Assistant
Michael Masiuk, Extension Agent, Penn State University – Allegheny County
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