Most Garden Soil Nematodes Graze Microbes; Only Root-Knot Types Gall Roots

… more less Bacterial- and fungal-feeding nematodes release NH₄⁺ and outnumber plant parasites in most beds. Root-knot (Meloidogyne) makes swellings inside the root that will not rub off; legume Rhizobium nodules sit on the side and pop off with a thumbnail.