Carrot Weevil Description: Legless larva or grub is white with a brown head. Infested carrots have tunnels and soft tissue in upper part of roots. Solution: Super-Light Insect Barrier provides an excellent shield if edges are kept buried under soil through spring and summer. (Adult beetles crawl over ground to lay eggs at carrot’s base.) Apply Grub-Away Nematodes while plants are still small to prevent infestation; once weevils have started tunneling, the damage is done.