Powdery Mildew of on a leaf of perennials

Stop It Before It Starts: Powdery Mildew

Every seasoned gardener has had at least one bout with powdery mildew. It is annoyingly pervasive, and no one wants to see those tell-tale spots on their plants. It seems that everywhere we look- trees, landscaping, gardens- there is no escaping it.  So what exactly is it, and how can you keep it from stunting your plants’ growth and destroying your yield?  How can you avoid what seems to be everywhere?

What is powdery mildew?

Powdering mildew is a generic term that refers to a group of related fungi that are plant-specific and share common symptoms.  Because they are plant-specific, the powdery mildew that you have on your ornamentals will not necessarily spread to your vegetable garden.  Despite this, powdery mildew does spread easily from plant to plant and spores can easily travel through the air.  They can even move through screen windows, so your indoor plants are at just as much risk as your outdoor ones.

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Powdery Mildew of on a leaf of the tree

Powdery Mildew: Chemical Controls

Chemical Controls for Powdery Mildew

Some of our past posts have looked at cultural and biological controls for powdery mildew. These, along with Greencure, are all typically approved for use in certified organic agriculture.

Now, it’s time to talk dirty. So, get out your PPE (personal protective equipment), take a deep breath, and prepare to kill some bacteria and fungi…

Synthetic chemical fungi killers come last in this series because, ideally, they are a last resort. While undeniably useful components in an integrated disease management plan, they should not be relied upon as a substitute for good gardening practices.

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