| Distribution |
Austria, China, Germany, Korea |
| Characteristics |
Lesions commonly present on leaves and stems, causing discoloration of the affected tissues, initially yellowish, later becoming greyish, frequently covering larger areas by coalescing. Down present on the lower leaf surface, whitish, consisting of dense, felt-like conidiophore outgrowth evenly distributed over the affected surface. Conidiophores hyaline, tree-like, (187.2–)195.7–240.8–285.9(–342.1) µm long, (8-)10–14(-16) µm wide and branched 3–5 times (n=15). Ultimate branchlets slightly curved to sigmoid and (7.6–)9.1–13.4–17.7(–25.0) µm long, (1.6–)1.9–2.4–3.0(–3.6) µm wide (n=30). Conidia hyaline, ovate to ellipsoidal, (24.0–)26.4–29.8–33.2(–38.8) µm long, and (18.7–)20.9–23.6–26.2(–28.2) µm wide, with a l/w ratio of (1.03–)1.14–1.27–1.40(–1.56) (n=30). Resting organs not seen. |
| Notes |
This species was originally described as Peronospora sisymbrii-sophiae on Descurainia sophia and was transferred to Hyaloperonospora based on molecular phylogenetic evidence (Göker et al. 2009). It has been primarily reported from D. sophia. In Korea, H. sisymbrii-sophiae was identified on D. pinnata based on morphological characteristics and ITS and cox2 sequence data, expanding its known host and geographic range (Lee et al. 2021). |
| Economic importance |
No quantitative economic losses caused by H. sisymbrii-sophiae have been reported. Its known hosts are primarily wild or weedy brassicaceous plants. |
| References |
Gäumann, E. A. 1918. Beih. Bot. Centralbl. 35:395.
Göker, M., et al. 2009. Mycol. Res. 113:308.
Hong, Q., et al. 2018. Plant Dis. 102:685.
Lee, J. S., et al. 2021. J. Plant Pathol. 103:709. |
