Boxwood Leafminer Fact Sheet

Mines are not evident for several weeks. The adult fly dies soon after. The boxwood leafminer continues to be the primary pest we deal with in boxwood.

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Blistering is most apparent on the undersides of the leaves and becomes most obvious late in the.

Boxwood leafminer fact sheet.

The good news about the boxwood leafminer is there are effective control options. This is the most serious insect pest that attacks boxwood. Over the period of several years a lightly infested plant can become discolored brown and even defoliated. These flies are less than inch long and can often be seen swarming around boxwoods in the spring.

The infested leaves appear blistered from late summer through the following spring. Oval water soaked swellings on the lower leaf surface evident from midsummer until shed. Boxwood leafminer is the most destructive insect pest of boxwood. Infested leaves are spotted yellow and may drop prematurely.

The larvae of this fly feed on the tissue between the outer surfaces of the leaves. When the boxwood s new growth appears in spring the females mate then insert their eggs into the underside of the leaves. Conspicuous egg punctures in leaves. The adult leafminer is a yellow to orange red fly that looks like a mosquito.

Boxwood leafminer presence is indicated by blistering or irregularly shaped swellings on the leaves. The leafminer is the larva immature form of a small orangish mosquito like fly. We have seen severe leafminer populations kill boxwood. New leaves do not show signs of mining until late summer when the larvae are larger.

Common boxwood buxus sempervirens symptoms. Boxwood leafminer monarthropalpus flavus. This feeding results in blotch shaped mines in the boxwood leaves. Adult flies swarm around boxwoods about the time that the weigelas bloom.