Good morning Gerry.
I have for 4 years BIRCH TREE and now tree has Birch Leafminer . Last year myself tried to fight it, but now it has become higher. Can you help me?
Hi Svetlana, currently there is no easy solution for the caterpillars of the Birch Leaf Miner once they have gotten into the leaf. They are inside the leaf between the upper and lower surface. Normal insecticides do not penetrate the leaf surface to reach the insects.
Have you tried the nematodes that should be applied in early May to attack the adults which overwinter in the soil?
It is too late for this year. The leaf miner is rarely fatal to the birch, although it does make the plant unattractive and possibly weaker.
If the tree's trunk is large enough (4 inches or more), Acecaps could be inserted into the trunk to place an insecticide within the tree's sap.
