Also, if there is excess rain, pollination is interfered with.
Feb 02, Early pecan scab infection of young nuts will cause nuts to drop and is a major cause of pecan crop failure.
The same thing is happening again this year.
Black walnut is highly vulnerable to anthracnose, and the disease is. Sep 06, A: Poor pollination, insect damage and stress can trigger premature drop. Pollination is not usually a problem if there's a tree within feet that blooms at Estimated Reading Time: 1 min. Jul 31, Other causes are disease. The wet weather can also allow fungal infections to take place.
Once infected, nuts are dropped by the tree in response.
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. Water stage in later July and early August is the most common form of pecan drop.
A small insect known as the pecan nut casebearer is the cause of pecan shedding at three different periods of the year; mid-May, July and on rare occasions in late August.
As the nuts move from size development into kernel formation the pecan sheds very easily. Any stress received by the tree at this stage can result in major fruit drop. Some trees can lose up to one half of its crop if not properly managed during water stage. Apr 27, Green Pecans: Why Are They Falling & What to Do With Them? High winds from hurricanes and tornadoes Pests knocking them down Tree purging itself of too much fruit Insufficient water or soil deficiency (usually nitrogen or zinc) Pests like worms Poor pollination.