Ash Yellows
Until recently, the closest you could get to a scientific name for the cause of ash yellows was to call it a “mycoplasmalike organism” or MLO. Plant pathologists are pretty conservative people and even after more than 20 years of study no one felt they know enough about this tiny organism to describe it adequately, grow it in culture, or be 100% sure that it and only it caused ash yellows. Finally, the evidence became overwhelming and phytoplasma has been the official name since early this year.
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