SUMMARYRoots ofZea maysplants grown in soils of high organic content in reclaimed fields of the Albemarle-Pamlico peninsula of North Carolina were found to be abundantly infected withLigniera junci(Plasmodiophorales).Amaranthus hybridus, Eupatorium capillifolium, Panicum dichotomiflorum, Physalis angulata, andPolygonum lapathifoliumgrowing in the same fields were also infected withL. junci.In the greenhouse,L. juncidid not reduce growth ofZ. mays.Plants grew poorly in non-fumigated field soil but grew well in soil fumigated with methyl bromide or sodium azide. Infection byL. junciwas abundant in plants grown in non- fumigated soil and even more abundant in sodium-azide-fumigated soil.