Nematodes are non-segmented roundworms that live in the soil and in some cases, they can affect your trees.
Nematodes, WSU Tree Fruit
Beech Leaf Disease at Cape Cod National Seashore (U.S. National Park Service)
Nematode, Definition, Description, Diseases, & Facts
Nematodes Agriculture and Food
Signs of Nematode Damage and How to Keep your Plants and Turf Protecte
Nematodes / Prune / Agriculture: Pest Management Guidelines / UC Statewide IPM Program (UC IPM)
My Leaves Have These Weird Bumps and Lumps on Them! — Arborsmith, Ltd.® crafstman in the care of trees
Nematodes and Tree Growth - The Almond Doctor
Root-Knot Nematode - Prevention and Control
Plant parasitic nematodes harm pineapple crop yields in Kenya