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Garden cress Lepidium sativum L. This plant was recently introduced and is cultivated as an edible green under organic farming in Korea. In September , seedlings showing typical symptoms of powdery mildew were found in greenhouses in Pyeongchang County, Korea. Symptoms first appeared as thin white colonies, which progressed to abundant growth on the leaves and stems. Infected herbs were unmarketable mainly due to signs of senescence and withering of leaves and mostly abandoned without becoming harvested.
F and F Appressoria on the mycelium were well-developed, lobed, and solitary or in opposite pairs. Germ tubes were produced on the perihilar position of conidia.
No chasmothecia were found. These structures are typical of the powdery mildew Pseudoidium anamorph of the genus Erysiphe. The specific measurements match with those of E. Junell as previously described 1. The resulting bp sequence was deposited in GenBank Accession No. Pathogenicity was confirmed through inoculation by gently dusting conidia onto leaves of five healthy potted garden cress plants.
Five non-inoculated plants served as controls. Inoculated plants developed signs and symptoms after 8 days, whereas the control plants remained symptomless. The fungus present on the inoculated plants was morphologically identical to that originally observed on diseased plants, fulfilling Koch's postulates. To our knowledge, this is the first report of powdery mildew caused by E.
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Gadoury DM, et al. Mol Plant Pathol. Epub Jun Show more similar articles See all similar articles. Full-text links [x] Atypon. Copy Download.
First Report of Powdery Mildew Caused by Erysiphe Cruciferarum on Garden Cress in Korea
Spider flower Cleome hassleriana L. During July , severe outbreaks of a powdery mildew were observed in a public park in Torino northern Italy. Leaves were covered with dense, white hyphae and conidia, especially on the adaxial surface. Hyphae were also present on petioles and fruits, but not on petals and stems. As the disease progressed, infected leaves turned chlorotic, curled, and wilted. Conidia were hyaline, cylindrical, single, and measured Germ tubes terminating in a moderately lobed appressorium were produced terminally.
EPPO Global Database
For practical reasons we have decided not to translate all pages in several languages anymore because it was too heavy to maintain but some of the labels of the basic and advanced query pages are still available. Click on the language titles to launch them. Chinese version. Run Zhang 1 and Dr. German version.
Erysiphe cruciferarum is a plant pathogen of the family Erysiphaceae , which causes the main powdery mildew of crucifers, including on Brassica crops, such as cauliflower, cabbage, broccoli, and Brussels sprouts. It is also an obligate parasite that appears to have host specificity; for example, isolates from turnip will not infect Brussels sprout, and vice versa. It is also being evaluated as a potential biological control for the invasive plant garlic mustard. Erysiphe cruciferarum exhibits typical powdery mildew characteristics, appearing as small radiating, diffuse colonies of superficial white mycelium on the surface of the leaf; usually both sides of the leaf show white, powdery fungal growth.