abstract:MRDD or MR/DD, short for Mental Retardation and Developmental Disabilities, refers to services designed to assist mentally and developmentally challenged people and their families. In the United States, this term is used by state and local government agencies that receive federal funding under Title XIX of the Social Security Act of 1965.
Maizerough dwarf virus(MRDV)andriceblack-streaked dwarf virus(RBSDV)which transmitted byLaodelphex striatellus Fallen are reported as the pathogens of maize rough dwarf disease(MRDD).