Journal of Plant Pathology (2017) 99, 347-354

D. Bertetti, G. Ortu, M.L. Gullino and A. Garibaldi (2017)
Identification of Fusarium oxysporum f. sp. opuntiarum on new hosts of the Cactaceae and Euphorbiaceae families
Journal of Plant Pathology 99 (2), 347-354
Abstract: Fusarium oxysporum has recently been detected in commercial nurseries in the Liguria region (northern Italy) on new succulent plants belonging to the Cactaceae family (Astrophytum myriostigma, Cereus marginatus var. cristata, C. peruvianus monstruosus and C. peruvianus florida) and to the Euphorbiaceae family (Euphorbia mammillaris). The pathogen has been identified, for all the new hosts, from morphological characteristics observed in vitro. The identifications have been confirmed by means of internal transcribed spacer (ITS) analysis and/or by translation elongation factor 1α (TEF) analysis. The aim of this work was to identify the forma specialis of the F. oxysporum isolates obtained from new succulent plants. This has been investigated by means of phylogenetic analysis based on the TEF gene and intergenic spacer (IGS), carried out on singlespore isolates, together with pathogenicity assays. The results of this research led to include four new succulent hosts from Cactaceae as additional hosts to F. oxysporum f. sp. opuntiarum. This forma specialis has been identified for the first time on a new host (Euphorbia mammillaris) not belonging to the Cactaceae family.
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Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Fusarium oxysporum f.sp. opuntiarum	Euphorbia (crop)	Italy
	Fusarium oxysporum f.sp. opuntiarum	Cereus (genus)	Italy