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Uredo is a genus of rust fungi: long considered incertae sedis in the order Pucciniales, but now placed in the family Pucciniaceae. [2] This long-established genus, together with the closely-related Uromyces (which some authorities consider to be synonymous), give their names to "uredo-type" fungal spore structures such as "urediniospore" and uredinium".
Urediniospores are more or less reniform, 26–40 × 18-28 μm, with hyaline to pale yellowish wall, 1–2 μm thick, strongly warted on the convex side, smooth on the straight or concave side, warts frequently longer (3–7 μm) on spore edges. There have been no known reports of a host capable of supporting an aecial stage of the fungus. [5]
The leaf discoloration is due to fungal structures called sori, which are clusters of spore-bearing structures. During sporulation, sori burst through leaves releasing teliospores and cause leaves to appear tattered. [3] These spores are reddish brown, smoothly rounded, and they tend to be in clumps of 5-6 with sterile cells around them. [6]
Puccinia graminis is a macrocyclic heteroecious fungus that causes wheat stem rust disease. [citation needed] The sexual stage in this fungus occurs on the alternate host – barberry – and not wheat. The durable spore type produced on the alternate host allows the disease to persist in wheat even in more inhospitable environments.
Uromyces betae is a fungal species and plant pathogen infecting beet (Beta vulgaris). It was originally published as Uredo betae Pers. 1801 before it was transferred to the Uromyces genus. [2] Sugar beet rust was first described in Canada in 1935,(Newton and Peturson 1943), [3] and then reported in Europe in 1988 (O'Sullivan). [4]
The spores need several hours of dew or rain for spores to germinate and infect the host. [25] [26] Puccinia asparagi thrives where dews or fogs are prevalent because droplets of water are needed for successful infection of the host plant. [17] At 59 °F (15 °C) a three-hour, spore-wetting period is needed for initial infection.
Uredo behnickiana. Henn. (1905) Uredo behnickiana is a fungal plant pathogen. It is known as a pathogen of Cattleya orchids. [1] References
Uredo musae is a fungus that is a plant pathogen, infecting bananas. References. External links. Index Fungorum; USDA ARS Fungal Database This page was last ...