Planting several varieties helps reduce the poor pollination drop problem.
Apr 27, Why Are Pecans Falling off the Tree Green?
As the pecans inside start to ripen, the husks will turn brown and eventually begin to crack.
In most cases, pecan trees drop their nuts in the fall when they are fully ripe and ready to be harvested. The husk will start to split and the nutshell beneath the husk will turn brown. When fallen pecans are green, this means something has interfered with the ripening process. A. Many people have the same problem. Pecan nut and leaf drop in late summer is caused by water stress or injury by insects and/or disease. Young nuts are very sensitive now and will abort at the onset of any stress.
Water slowly and deeply and control. Jul 31, Other causes are disease. The wet weather can also allow fungal infections to take place. Once infected, nuts are dropped by the hla stump grinder in response.
My guess is that even though you have been watering your grass during hot, dry periods, you have not deep watered your pecan trees.
Lack of pollination is another cause. If the pecans weren't adequately pollinated in May; usually due to weather there will be no embryo tree inside the nut causing the tree to drop it.
Why are my pecans falling off the tree green? When fallen pecans are green, this means something has interfered with the ripening process.
Possible reasons for green pecans falling include pests knocking them down or the tree could be purging itself of too much fruit.