Healthy birch trees usually can withstand even a heavy infestation of birch leafminers, whose feeding creates large brown blotches on the leaves, says Jeff Hahn, an extension entomologist at the University of Minnesota. Meanwhile, the number of Japanese beetles in Minnesota has been increasing in the past five to six years, and they target roses, grapevines and many flowering annuals and perennials. The best way to get rid of them is to handpick them and drop them in soapy water, according to this piece.

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