Japanese beetles are eating the leaves on a river birch. Severely damaged leaves turn brown and fall from trees. Something is eating the leaves. The active ingrediant (imidicloprid) is a sytemic that is translocated by the plant from the roots to the leaves. 1 Response. Her work has appeared in "The Saint Paul Almanac" and in magazines such as "Inventing Tomorrow" and "Frontiers." The Japanese beetle, a most destructive garden pest, devours just about everything in its path, including well-tended trees and shrubs. http://blog-yard-garden-news.extension.umn.edu/2017/07/dealing-with-japanese-beetles.html, http://www.extension.umn.edu/garden/insects/find/japanese-beetles/. What should I do? Often, they’ll leave nothing more than the skeleton behind. Getting a tree service to perform a soil-applied systemic insecticide injection in … Next year apply Bayer Advanced Tree & Shrub to your birch at the start of May. When a Japanese beetle infestation is severe, tree leaves may brown at the top of the canopy or leaves may drop prematurely. If you look closely on your first picture you will see the beetles. Description: The bronze birch borer beetle wend their way through birch bark laying eggs. The metallic blue alder leaf beetle ( Agelastica alni ) feeds on the leaves of alder trees. Japanese Beetles. The invasive Japanese beetle damages a range of plants, including the birch tree, where it likes to feed on the upper leaves exposed to full sun. Oriental, Asiatic garden, and Japanese beetles all spend their first … Generally, the … The birch leafminer is found on all species of birch trees. Follow up with a treatment of trichlorfon in July if the area is highly infested. Leaf-eating beetles are a natural part of the environment and, often, their damage is minimal and of little concern. To protect bees, apply insecticides during late evening after bees are no longer active. The University of Utah Extension recommends encouraging natural enemies of the Japanese beetle by planting a variety of plants that produce pollen and nectar, and selecting plants that adult beetles avoid, such as dogwood, American holly, lilac, magnolia, and forsythia. These beetles love the summer months (even though they’re only around for six to eight weeks). However, birch trees are one of their favorites. You can learn more about japanese beetles at the japanese beetle … Forty-eight hours before applying the chemical, water the area with 1/2 inch of water to bring feeding grubs closer to the soil surface. Japanese beetle traps may do more harm than good, according to the University of Illinois, because the traps attract more beetles to the area than they capture. To protect bees, apply insecticides during late evening after bees are no longer active. If you find two to three per square, plus obvious damage to the turf, proceed with chemical treatment. Common Tree Bugs In DC, Northern VA, and Maryland Eastern Tent Caterpillars: These hairy tree bugs, with areas of blue, white, black, and orange, are social species that form communal nests in the branches of trees and shrubs. They look ... 2016, 9:53 PM EDT. Some sort of beetle is eating the leaves on our birch trees. Japanese beetles are active during daylight hours. The damage can be identified by skeletonized leaves (eating the area between a leaf's veins) and large holes in leaves, this can often appear to be a lacey texture. We have three large white bark birch trees in our yard. Japanese beetles eat almost 300 different kinds of plants and are particularly fond of linden and birch tree leaves, roses, raspberries and the fruits of trees such as peaches and plums. (Mexican Bean Beetles can also leave foliage skeletonized, though, so be sure to identify the beetle by their appearance as well.) 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