Abstract:
Arctostaphylos pungens
“Manzanita” is an important shrub in the southwestern USA, and northern and
central Mexico. Manzanita bears apple-like fruit that is utilised for a range of edible products. Over the past two
years, several foliar disease problems were noted on this host
in the San José de Gracia region of Mexico. The
aim of the present study was to elucidate their identity through the analysis of morphological characters and DNA
phylogeny (based on the large subunit nuclear ribosomal RNA gene and the ITS spacers and the intervening
5.8S rRNA gene of the nrDNA operon) of the fungi associated with these disease symptoms. Three species are
newly described:
Phaeococcomyces mexicanus
sp. nov., a presumed epiphyte, and two species associated with
leaf spots and defoliation, namely
Coccomyces arctostaphyloides
sp. nov. and
Passalora arctostaphyli
sp. nov.
A fourth species is also associated with leaf spots and tip dieback is
Harknessia
arctostaphyli
, for which an epitype
is designated. All species can co-occur on the same shrub, which adds to the stress experienced by the plant,
leading to further defoliation and dieback
Abstract:
Arctostaphylos pungens
“Manzanita” is an important shrub in the southwestern USA, and northern and
central Mexico. Manzanita bears apple-like fruit that is utilised for a range of edible products. Over the past two
years, several foliar disease problems were noted on this host
in the San José de Gracia region of Mexico. The
aim of the present study was to elucidate their identity through the analysis of morphological characters and DNA
phylogeny (based on the large subunit nuclear ribosomal RNA gene and the ITS spacers and the intervening
5.8S rRNA gene of the nrDNA operon) of the fungi associated with these disease symptoms. Three species are
newly described:
Phaeococcomyces mexicanus
sp. nov., a presumed epiphyte, and two species associated with
leaf spots and defoliation, namely
Coccomyces arctostaphyloides
sp. nov. and
Passalora arctostaphyli
sp. nov.
A fourth species is also associated with leaf spots and tip dieback is
Harknessia
arctostaphyli
, for which an epitype
is designated. All species can co-occur on the same shrub, which adds to the stress experienced by the plant,
leading to further defoliation and dieback
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