Boxelder bug infests boxelders, primarily the female trees. The insect does no serious harm to the tree but is a nuisance when it overwinters in homes. The insects are red and black and can be vacuumed up when seen in the house. Control measures include removal of female boxelder trees. If boxelders are growing in adjacent yards removing your tree may not be effective.
Scales are an occasional problem on maples.
Perhaps the most common is cottony maple scale. The insect forms a cottony mass on the lower sides of branches. Scales are controlled with dormant oil sprays applied in spring before growth begins. Scales may also be controlled with well timed sprays to kill the crawlers. If borers become a problem it is an indication the tree is not growing well.