Boxwood Leafminer Fact Sheet

The boxwood leafminer continues to be the primary pest we deal with in boxwood. Oval water soaked swellings on the lower leaf surface evident from midsummer until shed. New leaves do not show signs of mining until late summer when the larvae are larger.

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The adult fly dies soon after.

Boxwood leafminer fact sheet.

Boxwood leafminer presence is indicated by blistering or irregularly shaped swellings on the leaves. The good news about the boxwood leafminer is there are effective control options. Blistering is most apparent on the undersides of the leaves and becomes most obvious late in the. Adult flies swarm around boxwoods about the time that the weigelas bloom.

This feeding results in blotch shaped mines in the boxwood leaves. Common boxwood buxus sempervirens symptoms. Boxwood leafminer monarthropalpus flavus. This is the most serious insect pest that attacks boxwood.

Mines are not evident for several weeks. These flies are less than inch long and can often be seen swarming around boxwoods in the spring. The leafminer is the larva immature form of a small orangish mosquito like fly. The adult leafminer is a yellow to orange red fly that looks like a mosquito.

The infested leaves appear blistered from late summer through the following spring. Boxwood leafminer is the most destructive insect pest of boxwood. The larvae of this fly feed on the tissue between the outer surfaces of the leaves. Over the period of several years a lightly infested plant can become discolored brown and even defoliated.

Infested leaves are spotted yellow and may drop prematurely. We have seen severe leafminer populations kill boxwood. Conspicuous egg punctures in leaves. When the boxwood s new growth appears in spring the females mate then insert their eggs into the underside of the leaves.