Some places go beyond declaring these trees to be invasive to actually outlawing them. As a result, they're considered invasive in many places, including the Pacific Northwest and in the eastern United States from as far north as Wisconsin and Maine and as far south as Virginia and Tennessee. Norway maples grow quickly and spread rapidly, becuse they produce a lot of seeds that germinate easily. For that reason, it's a good idea to consult a professional arborist to help treat borers.Ĭrimson king is a type of Norway maple tree. There are several types of borers you'll need to know what kind of borers are doing damage to treat the tree. They usually only attack trees that are already distressed and may prove fatal to the tree if left untreated. Borers: If you see small, rounded holes and sawdust-like residue on your tree trunk, borers are the likely culprit.This is primarily a cosmetic problem you can help to control them by spraying with horticultural oil. As with aphids, natural predators play a role in keeping cottony maple scale (and other scale insects) in control. Cottony maple scale: If you see small (between 1/4 and 1/2 inch long) cottony egg sacs on your tree, that's a sign of cottony maple scale.Predatory insects usually help keep the aphid population under control, though you can also spray with horticultural oil to help repel aphids. Aphids: If your crimson king has wilted, curling leaves, poor growth, and you see a nasty, sticky substance (honeydew) on or under the tree, it probably has aphids.If you have these trees, be on the lookout for the following pest species: ![]() Crimson king maples aren't overly susceptible to pests, but - like most trees - they can sometimes experience issues.
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