Over the period of several years a lightly infested plant can become discolored brown and even defoliated.
Boxwood leafminer fact sheet.
This feeding results in blotch shaped mines in the boxwood leaves.
The infested leaves appear blistered from late summer through the following spring.
These flies are less than inch long and can often be seen swarming around boxwoods in the spring.
The larvae of this fly feed on the tissue between the outer surfaces of the leaves.
Mines are not evident for several weeks.
When the boxwood s new growth appears in spring the females mate then insert their eggs into the underside of the leaves.
Blistering is most apparent on the undersides of the leaves and becomes most obvious late in the.
The adult fly dies soon after.
Boxwood leafminer presence is indicated by blistering or irregularly shaped swellings on the leaves.
Conspicuous egg punctures in leaves.
Oval water soaked swellings on the lower leaf surface evident from midsummer until shed.
Boxwood leafminer is the most destructive insect pest of boxwood.
Boxwood leafminer monarthropalpus flavus.
Adult flies swarm around boxwoods about the time that the weigelas bloom.
We have seen severe leafminer populations kill boxwood.
New leaves do not show signs of mining until late summer when the larvae are larger.
The adult leafminer is a yellow to orange red fly that looks like a mosquito.
Infested leaves are spotted yellow and may drop prematurely.
Common boxwood buxus sempervirens symptoms.
The good news about the boxwood leafminer is there are effective control options.