Answer: A pest commonly found munching on the roots of hosta plants is the black vine weevil. Black vine weevil adults chew irregular notches on the edges of hosta leaves. The black vine weevil larvae that feed on the crown and roots, however, do the most serious damage; symptoms of injury include yellowing and wilting of foliage.
Either Dursban or Orthene should provide control of the adult weevils. Apply according to label directions.
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