First report of rust of Sidalcea malviflora (dwarf checkerbloom) caused by Puccinia sherardiana in Washington State.

Description of the Demicyclic life Cycle of Puccinia Sherardiana in Sphaeralcea Angustifolia in Mexico.

“…Regarding the telia development, Briere and Franc (1998) reported that they are present on both sides of the leaf in S. grossulariaefolia and S. munroana. On the other hand, Dugan and Nazaire (2011) observed telia mainly in the adaxial part of Sidalcea malviflora leaves, while in this study they only appeared in the abaxial part. Which indicates that variations may occur depending on the host.…”

“…It is important to mention that in this work, the morphometric characteristics of the pycnia and pycniospores are described for the first time. The aecial phase is reported with its respective description of the aecia and aeciospores, thus, P. sherardiana is classified as a demicylic rust and not as a microcyclic rust as previously reported by Arthur (1962), Briere and Franc (1998) and Dugan and Nazaire (2011). These authors also mentioned that the rust lacks the aecial and uredinial phase.…”

“…2g). Based on the morphological characteristics of teliospores, rust was identified as Puccinia sherardiana Körn in according to Arthur (1962), Demers et al (2015), Dugan and Nazaire (2011). The uredial stage was not observed.…”

“…Puccinia sherardiana has been reported in the USA (Arizona, California, Colorado, Nevada, Oregon, Washington, Idaho, Nebraska, New Mexico, Texas, Utah, Wyoming, Montana, and North Dakota) infecting different species of the genera Alcea, Malvastrum, Sidalcea and Sphaeralcea, within the Malvaceae family (Arthur 1962;Briere and Franc 1998;Horst 2008;Dugan and Nazaire 2011;Demers et al 2015). In the case of Mexico, Arthur Regarding morphometry, the characteristics of the P. sherardiana teliospores identified on S. angustifolia were similar to those reported by Arthur (1962), Briere and Franc (1998), Dugan and Nazaire (2011) and Demers et al (2015). However, there were some differences, for example, in this study, teliospores were narrower (15.8 µm), compared to the size reported (27-30 µm) by the previously mentioned authors in different hosts, 30.85 µm in Sphaeralcea grossulariaefolia and S. munroana, 21-25 µm in Sidalcea malviflora and 18-30 µm in Alcea rosea.…”

“…Different species of Sphaeralcea, Sidalceae, Althaea, Malvastrum, and Alcea (Malvaceae) are affected by Puccinia sherardiana Körn (Horst 2013;Demers et al 2015); which is a rust reported as microcyclic (Arthur 1962;Briere and Franc 1998;Dugan and Nazaire 2011). This rust is characterized by producing symptoms and signs both on the stem and on the leaves consisting of the presence of dark brown telia, surrounded by chlorotic halos.…”