Aster yellows (AY), caused by mycoplasma-like organisms (MLOs), was investigated in this study. Natural AY incidence in carrot and lettuce was recorded in three different locations in Oklahoma. MLO isolates from carrot, lettuce and daisy fleabane were collected and characterized. A trispecific polyclonal serum, produced against an AY MLO isolate from Oklahoma carrot, was used in serological detection of AY in different host sources. Selected wheat and peanut cultivars were screened for susceptibility to Oklahoma AY MLO.Plant Patholog
