|I planted three large hostas in a bed under two ash trees last year. They came back great this year but I noticed a few days ago that the leaves on one were turning yellow and dying. I pulled some of the dying leaves and it looks like some kind of bug is infesting the roots and eating the stems at ground level. Possible a small black bug twice the size of a flea. I have now noticed the one of the others has leaves that are turning yellow. What should I do?|
|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.