Stromatinia species of agriculture importance and taxonomic elements for their classification
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Abstract
The aim of the present work was to classify Stromatinia species of agricultural importance
and to define some taxonomic elements for their classification. The genus Stromatinia has a
stroma similar to that of Sclerotium. The hyphae are not embedded in a gelatinous matrix, the
stroma is not the typical hollow-spheroid, and the remnants of suscept tissues are not usually
embedded in the sclerotium. The apothecia arise from a thick, subcuticular, effused covering of
the small, black, globose sclerotia that commonly form on the aerial mycelium. The apothecia
observed in nature are similar to those of Sclerotinia, as they contain hyaline and unicellular
ascospores. Among the species of greatest agricultural interest are Stromatinia cepivora (Berk.)
Whetzel, which causes white rot of onion and garlic bulbs, whose sclerotial phase is Sclerotium
cepivorum Berk., Stromatinia gladioli (Drayton) Whetzel (sin. Sclerotinia gladioli Drayton),
which causes dry rot of gladiolus and plants of the genera Crocus, Freesia, and Tritonia. In
addition, there are Stromatinia narcissi Drayton and J.W. Groves that affect plants of the genera
Narcissus and Zephyranthes, Stromatinia geranii (Drayton) Whetzel that causes rotting at the
base of stems and root of Geranium maculatum L., with an anamorphic phase corresponding to
Botrytis, while Stromatinia rapulum (Bull.) Boud. attacks the rhizomes of plants of the genus
Polygonatum and is associated with a sclerotial phase known as Sclerotium denigrans Pape. This
paper presents several species of Stromatinia of agricultural importance and some taxonomic
elements for their classification, which will avoid naming the diseases they cause only by
referring to their sclerotial stages.
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