I have noticed a small hole, about 1-inch in diameter, at the base my red-twig dogwood shrub. Since this hole has appeared, the shrub appears to be doing poorly. Any guesses as to what is down there? I tried the garden hose, but could not see anything emerge anywhere. Any and all help is appreciated -- Thanks!
The dogwood borer is a common pest and young trees are usually attacked near ground level, often around lawn mower injuries. There are insecticides available and they should be applied in late spring or early summer.