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  2. Powdery mildew - Wikipedia

    en.wikipedia.org/wiki/Powdery_mildew

    Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales . Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive.

  3. Why you should take steps if you see a grayish powder ... - AOL

    www.aol.com/news/why-steps-see-grayish-powder...

    Powdery mildew usually appears in spring or early summer. Although it thrives in warm, humid conditions, it is also found in cooler climates. Easy, non-chemical practices can go a long way toward ...

  4. Erysiphe cruciferarum - Wikipedia

    en.wikipedia.org/wiki/Erysiphe_cruciferarum

    The powdery mildew initially appears as white, powdery spots formed on leaf surfaces, shoots, and sometimes flowers or fruits. Over time, the spots spread over a larger area of leaves and stems. Eventually, leaves infected with powdery mildew may turn yellow in color and proceed to die or fall off.

  5. Ampelomyces quisqualis - Wikipedia

    en.wikipedia.org/wiki/Ampelomyces_quisqualis

    Ampelomyces quisqualis is a mycoparasite of powdery mildews. It overwinters or survives in the absence of a suitable host as pycnidia. Raindrops cause conidia to be expelled from ripe pycnidia and these may splash onto nearby powdery mildew. Infection is favoured by humid conditions and temperatures in the range 20 to 30 °C (68 to 86 °F) and ...

  6. Powdery mildew is a fungal disease common on peonies ... - AOL

    www.aol.com/news/powdery-mildew-fungal-disease...

    — Sylvia Mendoza, Highwood The problem with your peonies is most likely powdery mildew, which is caused by a fungus. Onset generally appears between late June and ... Powdery mildew is a fungal ...

  7. How to protect grapevines from powdery mildew - AOL

    www.aol.com/news/protect-grapevines-powdery...

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