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The galls are small, individual and beadlike in some hosts.
In other plant species galls may be massive accumulations of fleshy tissue more than an inch in diameter.
Galls are often seen in Millettia pinnata leaves and fruits.Nematodes are microscopic worms that live in the soil.Some nematodes (Meloidogyne species or root-knot nematodes) cause galls on the roots of susceptible plants.Gall forming virus was found on rice plants in central Thailand in 1979 and named rice gall dwarf.Symptoms consisted of gall formation along leaf blades and sheaths, dark green discoloration, twisted leaf tips and reduced numbers of tillers.
Some ectoparasitic nematodes (nematodes that live outside the plant in the soil), such as sting and stubby-root nematodes, may cause root tips to swell.