Article: Circle the tree so that the clippings discharge away from the trunk, while beginning to circle as near the trunk as possible.  This will allow the mower discharge to propel the trimmings and any other debris away from the tree.  Continue mowing until at least 10–15 feet (3.0–4.6 m) beyond the tree's canopy so that nuts that fall near the edge will be visible to gather.  High winds can leave pecans a surprising distance from the tree when they are blown free. Wet weather can be detrimental to the nuts, and foraging wildlife may beat you to them if they are left on the ground.  Crows and squirrels are particularly fond of pecans, as are deer and other wildlife. Use a leaf blower if possible, since finding the pecans in a sea of similarly colored leaves will make the task even more difficult.

What is a summary?
Mow around trees with lawn grasses beneath them. Pick up pecans when they begin to drop. Keep leaves raked up or blown away.