Damage Caused By Birch Leafminer:

Birch leaves develop brown, inflated blotches by mid to late spring. Leaves may be killed by small larvae inside the leaves that devour green tissues between the upper and lower surfaces. A severely infested tree canopy takes on a tan-brown appearance and defoliates prematurely. Repeated years of an infestation can cause branch die-back and leave trees more vulnerable to borers and environmental stress.


Birch trees.

Birch Leafminer Life Cycle:

The adult birch leafminer is a 1/8-inch long, black, gnat-like insect referred to as a sawfly. The female deposits eggs into young leaves. Larvae hatch and begin feeding inside the leaves, causing damage. They mature within a few weeks, drop to the ground to pupate, and emerge as sawflies. There are one to two generations per year.

Birch Leafminer Management:

Foliar applications are effective when the birch leaves are about half-grown in spring. The second application in about three to four weeks may be needed to minimize damage from the second generation of birch leafminers. For season-long results, inject an application into the soil from August through October the year prior to birch leafminer activity. This new product accumulates slowly in the tree. Before planting, select a site where birch trees will prosper, such as in moist, well-drained sandy, or loamy soils. Trees will fail and become more stressed by leafminer damage when they are planted in heavy clay-type soils. Fertilizing, mulching, and watering also will help birch trees recover from birch leafminer damage.

See More Articles

Pest And Disease Bacterial Leaf Scorch Banner 1440X500
Leaf or Needle Dropping

Bacterial Leaf Scorch

Bacterial leaf scorch, also known as Marginal leaf burn, is a chronic and systemic disease mostly affecting oaks and maples.
Read More
Pest And Disease Chlorosis Banner 1440X500
Leaf or Needle Discoloration


Chlorosis is the result of a lack of chlorophyll production that may be caused by many conditions such as another disease, soil/water pH or nutritional imbalance, or tree wounds.
Read More
DSC 8019
DSC 8019

Get In Touch With Us!

We pride ourselves at Davey Tree on providing prompt, professional and personalized service from certified arborists that live, work and engage in your community. Contact one of our Davey Tree specialists for your residential needs.

Let's Find What
You're Looking For!