Twelve species of pathogenic fungi from the weeds in field in Guangdong province were found and described. They were Nimbya alternantherae from Alternanthera philoxeroides,Piricularia grisea from Digitaria adscendens,Pseudocercospora oxalidis from Oxalis corymbosa,P. oenotherae from Ludwigia prostrota, P. avicularis from Polygonum hydropiper,Cercospora beticola from Chenopodium ambrosioides,Septoria centellae from Centella asiatica,Sporisorium lepturi from Hemarthria compressa, Uromyces alopecuri from Alopecurus aequalis,Puccinia paspalina from Paspalum conjugatum,Physalospora commelinae from Commelina nudiflora,and Albugo bliti from Alternanthera sessilis. Among them, N. alternantherae,P. oxalidis,C. beticola and U. alopecuri could be potential mycoherbicides in future.