Description: The small adult fly is rather inconspicuous and it lays eggs on the young foliage in early summer. After hatching from the egg, the maggot bores into the leaf and feeds on the internal tissues before pupating inside the leaf in the following
spring.
Where to find evidence of them: When gathering holly for Christmas decorations, have a look at the foliage. Some leaves may have yellowish or purplish white blotches on the upper leaf surface. This is where the inside of the leaf has been eaten by the maggots or larvae of holly leaf miner.
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