This is a stop-gap treatment to get ants off the vines. Gr ape root borers can kill grapevines. Borers tunnel inside vines at or below ground level, weakening or killing them. There are two control options. Mounding provides cultural control.
Lorsban treatment provides chemical control.
Neither control system is without flaw. Mounding uses layers of soil to make it more difficult for young larvae to reach the roots or adults to emerge. It is equally important to knock these mounds back down between early November and late December. Look at 100 vines in each vineyard block. If possible treat before adult borers emerge, at least 35 days before harvest.