The line patterns are created as the leaf miners tunnel their way throughout plant leaves. Birch Leafminer and Its Control. As it continues to feed, signs of browning and drying become evident. Native to Europe, the birch leafminer, Fenusa pusilla, first appeared in Connecticut in 1923. Pest description and damage The adult insects are a small (0.125 to 0.375 inch) black sawfly. How to spot: Damage will be recognized on affected leaves appearing as white and black spots. You can try making a spray and apply it to the plants or invest in attracting beneficial insects that will not only enjoy your flowers but take care of leaf miners and other undesirable bugs at the same time.. Watch for small white worms. Simple DIY Leaf Miner Spray Recipes and Tips. This species also attacks gray and yellow birch as well. Adult leaf miners can be moths, beetles, or flies, and the tunnelling patterns of their larvae vary depending on the nature of the insect. Lawn and Tree Service, Inc. Minneapolis Branch 8401 73rd Ave N, Suite 56 Brooklyn Park, Minnesota 55428. Fenusa pusilla, on the other hand prefers gray birch or gray birch hybrids. The Birch Leafminer is the larval stage of a small wasp known as a sawfly. These leaf miner specific sprays can be used at any time of the year. In June, the centres of leaves may appear a lighter green as leaf miners munch on inner leaf tissue. One of the major pests of birch trees in Connecticut is the birch leafminer. The birch leafminer feeds on the tissue between the upper and lower surfaces of newly emerging leaves producing large dead blotches and eventual leaf loss. L.C.S. It does need 30 days to reach the leaves, so it needs to be applied very early in the spring to control current season leaf miners or in the late summer through fall for control next year. Naturally killing leaf miners with beneficial bugs. If left untreated, trees can lose large amounts of leaves and become susceptible to other insect infestations. The first indications of birch miner infestation are small green spots. Birch Leaf Miner Adult is a small fly. If left untreated, trees can lose large amounts of leaves and become susceptible to other insect infestations. Birch Leafminer Treatment Option 1. Leaf miner larvae usually spend their entire larval stage inside the host plant’s leaf. The leaves are ‘mined’ causing blotched areas on the leaves that eventually turn brown. Locate and compare Tree Service in Calgary AB, Yellow Pages Local Listings. Leaves that are attacked soon turn brown. As with any pest problem, the first step to treatment is identification. The most common sign a tree is infected is the presence of a tunnel on a leaf or the leaf being half green half yellow. Detection: Leaf miners are more visible but less deadly than borers. I’m assuming energy reserves were low after that because it was very susceptible to birch leaf miner. They tend to average 1/10 of an inch in length. 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