One key to successful fall fishing on natural lakes is targeting the edges of thick, green weedbeds. You can spot these edges where the vegetation grows almost to the surface. In deeper areas, use your sonar to find thicker clumps of grass. Cast or pitch softbaits or jigs to the edge where a wall of weeds meets open water. Largemouth bass cruise these edges looking for prey and strike lures that fall into this zone. If you don't get a bite as the lure lands, give it a shake and wait for a reaction. If nothing happens, reel in and cast again.