EN
The lists of eriophyoid mites on cereals and grasses occurring over the world and in Poland are given. The relations to their host plants including the transmission of viruses were also presented. Wheat Streak Mosaic Virus (WSMV) transmitted by Aceria tosichella, Ryegrass Mosaic Virus (RgMV) and Agropyron Mosaic Virus (AMV) transmitted by Abacarus hystrix are the most important viruses and their vectors. The host range of grass-infesting eriophyoid species of Poland were studied. 11 species of eriotyoid mites were found on many grass species. Directions of further studies related the enophyoids on grasses are suggested.