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Seattle Urban Farm Company - Garden trellises and supplies

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Episode 111: Powdery Mildew

November 2, 2021 hilary dahl
Powdery mildew on peas

Powdery mildew on Sugar Snap peas.

This week on the podcast we're tackling powdery mildew! Colin and Hilary are joined by Jenny Rebecca Glass, Extension Coordinator and Plant Diagnostician for the WSU-Puyallup Plant and Insect Diagnostic Laboratory. Jenny will help us answer your questions about the lifecycle of this common garden disease as well as management tips and techniques.


HOW TO LISTEN:

  • Subscribe on iTunes, Stitcher, Spotify, or any of your favorite podcast players to have new episodes sent directly to your device.

  • Listen right now in your browser by clicking above.

SHOW NOTES:

In this episode, we discuss:

  • The lifecycle of the common garden fungus powdery mildew

  • Organic management techniques

Important Take-aways:

  • Powdery mildew is the name given to a group of diseases caused by several closely related fungi.

  • Powdery mildew thrives in humid conditions

  • There are hundreds of different strains of powdery mildew (PM), each with it’s on unique host. PM will not transfer between plant families.

  • Powdery mildew can be found on buds, blossoms, leaves, twigs, and fruit

  • Terms

    • Obligate parasite: one that is entirely dependent upon a host for its survival

    • Ascomycete fungus: a group of fungi that ejects it’s spores via a spraying mechanism. Powdery mildew are the spores of an ascomycete fungus

    • Chasmothecia: the sexual fruiting bodies produced by the powdery mildew organism

  • Integrated Pest Management options:

    • Look for disease-resistant varieties when sourcing your seeds or plants

    • Prune and trellis your plants to encourage air circulation

    • Remove infected debris

    • Organic fungicides like sulfur, potassium bicarbonate and horticultural oils can be used to slow the spread

    • Spraying plants with water can also help break down the spores


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Have a topic you'd like see us dig in to? Email us at eb@seattleurbanfarmco.com


More about our special guest:

Jenny R Glass,

Jenny Rebecca Glass is the Extension Coordinator and Plant Diagnostician for the WSU-Puyallup Plant and Insect Diagnostic Laboratory. She is responsible for diagnosing plant problems ranging from abiotic factors, such as nutrient deficiencies or water stress, to biotic factors including plant pathogens and arthropod pests. She also helps people understand the available management options. In addition to deftly managing the Diagnostic Laboratory, Jenny provides plant pathogen training, covering plant problem diagnosis and integrated pest management, to diverse audiences in western Washington. Her favorite pathogen group is the downy mildews; however she was saddened by the recent introduction of this disease to impatiens, the go-to-annual for shade.

Jenny attended Oregon State University, completing her Master’s study in the Botany and Plant Pathology Department. In 2000, she joined WSU-Puyallup, where in addition to her laboratory responsibilities, she participates in several campus initiatives including leading Roadside Cleanup volunteers in beautifying the campus roadways.


Featured
Hilary Dahl
Hilary Dahl

Hilary Dahl is a co-owner of Seattle Urban Farm Company and host of the Encyclopedia Botanica podcast. Since 2010 Hilary Dahl has been helping beginning and experienced growers create beautiful and productive gardens. She has the unique experience of working in on a wide range of projects, from small backyard garden plots to multi-acre vegetable farms. She also works in her own garden every day after work. Hilary is also the creator of our podcast, the Encyclopedia Botanica, which she started as a way to share effective and efficient garden management techniques, and as a way to spread her love of growing food and flowers!

Colin McCrate
Colin McCrate

Colin McCrate has been growing food organically for over 25 years. He worked on a variety of small farms in the Midwest before moving to the west coast in 2003 to teach garden-based environmental education. He founded the Seattle Urban Farm Company in 2007 with the goal of applying years of horticultural and agricultural expertise to help aspiring growers get projects off the ground or more accurately; in the ground.

Since starting Seattle Urban Farm Co in 2007, he has helped guide hundreds of urban farmers through the design, construction and management of their own edible landscape. Colin is the author of three books; Food Grown Right, In Your Backyard(Mountaineers Books, 2012) and Grow More Food (Storey Publishing, 2022); and is a garden writer for the Seattle Times.

In Podcast, Winter Tags Encyclopedia Botanica, Podcast, Niki Jabbour, season extension, garden planning, organic gardening, vegetable gardening, winter gardening, cold frames, edible gardening
← Mulching Your Garden For FallEpisode 110: Growing Under Cover with Guest Niki Jabbour →
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