Abstract
Seventy-nine plots in Illinois, Iowa, Missouri, and Wisconsin were surveyed in 1990 for ash yellows (AshY) and other diseases and insects. Twenty-one of 38 white ash and 20 of 41 green ash plots had trees with AshY based on the 4',6-diamidino-2-phenylindole (DAPI) DNA-staining technique or the presence of witches'-brooms. AshY was widely distributed in all states except Wisconsin, where trees in only two of 20 plots were affected. Other than witches'-brooms, symptoms previously associated with AshY were present on trees in plots that tested both positive and negative for mycoplasmalike organisms (.)
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