Borers

Wood-boring insects are among the most destructive pests of ornamental trees and shrubs. Borers are the larvae, or immature stage, of certain moths and beetles. They tunnel and feed under the bark in living wood, destroying water- and sap-conducting tissues. This causes girdling, branch dieback,
structural weakness, and decline and eventual death of susceptible plants. Infestation sites also provide entry points for plant pathogens.