The Boxwood Leafminer continues to be the primary pest we deal with in Boxwood Shrubs. Over a season, a lightly infested plant can become discolored, brown, and even defoliated. It can lead to the death of the plant. There is one generation of the pest produced each year. Master Lawns has an effective control option.
The lifecycle of the Boxwood Leafminer covers twelve months of activity. The leaves develop blisters in spring and fall from the growing and feeding of the developing larvae under the epidermal cells of the leaves. In the spring, the leaves may already contain larvae from the previous fall.
The larvae soon pupate and around late May/early June they will emerge from the leaf as adults. To the naked eye an adult Leafminer appears to be an orange mosquito. The wind can carry them to new areas. After mating, the female lays eggs in the tender new growth of the Boxwood. The eggs hatch in the summer and become larvae. The larvae begin its growth cycle through fall, winter and spring of the following year.
The best method of control is to use a Soil Injected Insecticide that would be taken up by the shrub to provide a systemic cure. The insecticide is taken into the roots and internally distributed through the plant to destroy this pest in its larval stage; NO open-air spraying needed! Adjacent non-effected Boxwoods should be treated for protection. It can take a few months for the plant to fully distribute this treatment through its vascular system. This control method can last up to 2+ years, but less if your neighbors have this insect problem. Extra watering is recommended to achieve the quickest control.
Master Lawns is happy to provide this service to you!