ERYSIPHE POLYGONI PDF

Erysiphe communis f. Erysiphe betae is a plant pathogen. It is a form of powdery mildew that affects sugar beet. This pathogen is a strict obligated parasite, and therefore can only be identified when in planta.

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Buckwheat Fagopyrum esculentum Moench is an annual herb, mainly used in China for as food and as a nectar source for pollinators.

Since , powdery mildew has been consistently observed on buckwheat in its growing regions in Yunnan, China. Initially, irregular white, dust-like colonies occurred mainly on the adaxial surface of infected leaves.

As the disease progressed, colonies became abundant, covering the entire adaxial surface, and white patches then developed on the abaxial leaf surface and on stems. No fibrosin bodies were observed in the conidia. Germ tubes were produced from the ends of the conidia.

Cleistothecia were not detected with a microscopic on collected powdery mildew-infected samples. Based on morphological features, the fungus was identified as Erysiphe polygoni DC. Bradley et al. To confirm pathogenicity, inoculation was done by gently pressing the adaxial surface of an infected leaf with abundant sporulation onto the adaxial surface of a healthy leaf of a 5-week-old buckwheat plant.

Five plants were inoculated. Five noninoculated control plants were grown in another growth chamber under the same conditions as the inoculated plants. Inoculated and control plants were covered with polyethylene bags for 48 h after inoculation. Symptoms consistent with the infected field plants were observed on the inoculated plants, while no symptoms were observed on the control plants.

Microscopic observation revealed that the pathogen growing on the inoculated plants was consistent with the morphology of the original fungus. Powdery mildew on buckwheat infected by E. To our knowledge, this is the first report of powdery mildew caused by E. Home Plant Disease Vol. Lu Search for more papers by this author. Wang Search for more papers by this author.

Li Search for more papers by this author. Affiliations Authors and Affiliations W. Wang Y. Wang C. Add to favorites Download Citations Track Citations. References: Bradley, C. Plant Dis. Fungal Databases, Syst. Google Scholar Takamatsu, S. Metrics Downloaded times.

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The Perfect Stage of Powdery Mildew (Erysiphe Polygoni) of Beta Vulgaris Found in Michigan

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. A Nature Research Journal. In water-culture experiments with various plants, high concentrations of boron 1 , cadmium 2 , copper 3 , lithium 4 , manganese 5 and silicon 6 have been reported to reduce infection.

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Erysiphe polygoni

Powdery mildew Erysiphe polygoni DC [synonym E. The disease has been prevalent in many sugar beet-growing areas of the United States since the first major epidemic in beet in 3. Powdery mildew in the United States was primarily associated with the asexual stage of the pathogen until the perfect stage was found, first in western states such as Idaho and Colorado 2 , then in more Midwestern states such as Nebraska, and most recently in North Dakota 1. Similar to North Dakota, powdery mildew has not been a major problem in the Michigan growing area. It does appear sporadically, particularly on sugar beets that have not been sprayed to control other foliar diseases. In , powdery mildew infection on sugar beet was observed in late August in a field in the Saginaw Valley of Michigan. Plants were inspected periodically for the presence of the sexual stage.

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Buckwheat Fagopyrum esculentum Moench is an annual herb, mainly used in China for as food and as a nectar source for pollinators. Since , powdery mildew has been consistently observed on buckwheat in its growing regions in Yunnan, China. Initially, irregular white, dust-like colonies occurred mainly on the adaxial surface of infected leaves. As the disease progressed, colonies became abundant, covering the entire adaxial surface, and white patches then developed on the abaxial leaf surface and on stems. No fibrosin bodies were observed in the conidia. Germ tubes were produced from the ends of the conidia. Cleistothecia were not detected with a microscopic on collected powdery mildew-infected samples.

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