The common and highly possible disease that can affect the growth and health of the pecan trees are nematodes. When the leaves of your pecan trees begin to wilt and have some spots, it will be 100% sure that nematodes are the cause. This nematode disease is characterized by roundworms usually found on plant tissues and soil. Treatment of this infectious disease is quite simple as you need to prune the tree's canopy and remove some dead branches to stop the spread. Here are some other ways on how to treat nematodes on pecan trees.

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Source: Gardening Know How