powdery mildew

Battling Powdery Mildew: A Comprehensive Guide for Your Lawn

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Written By: Mark Marino, a Massachusetts Core Applicator License holder
and owner/operator of Lawn Phix,

No AI pledge. Authored and reviewed by Mark, not robots. Learn more.

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Powdery Mildew, a common disease affecting both turf and various landscape plants, poses a significant threat to the lush greenery of lawns and gardens. In this guide, we’ll delve into the nuances of powdery Mildew, its symptoms, and effective treatment strategies.

Understanding Powdery Mildew

Powdery Mildew on grass typically thrives in heavily shaded areas with dense turf during periods of high humidity. Recognizing the disease is relatively straightforward, as the mycelium manifests as a white, dusty, or powdery substance, resembling flour or talcum powder scattered across the grass. In severe cases, grass blades may turn yellow or red, leading to die-off.

Treatment Approaches

Contrary to preventive measures, Powdery Mildew on turf is best addressed curatively. While preventative fungicides are generally unnecessary, it’s crucial to intervene as soon as symptoms arise. The key is identifying the white, powdery mycelium as an initial indicator of the disease’s presence.

Impact on Landscape Plants

While Powdery Mildew affects grass, its more harmful and common impact is observed on various landscape plants. The severity of damage varies across plant species, ranging from minimal harm to defoliation or growth abnormalities such as distorted dwarfing, discoloration, and the formation of witches’ brooms. The extent of the damage depends on the infested plant’s specific species and variety.

Treatment for Landscape Plants

Swift action is essential for landscape plants susceptible to severe damage from Powdery Mildew. Professional fungicides are recommended for effective treatment. When choosing a fungicide, carefully read through labels, as many fungicides labeled for non-residential turf can still be safely used on residential ornamental plants with high success rates.


Powdery Mildew is a formidable foe that can mar the beauty of your lawn and landscape plants. By recognizing its symptoms early on and implementing appropriate treatment measures, you can safeguard your green spaces and ensure the continued vibrancy of your outdoor haven. Stay vigilant, act promptly, and enjoy a thriving, disease-free landscape.

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Author's Note: this piece has been updated for accuracy since its first publication on

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Author: Mark Marino
My name is Mark Marino, and I am the founder, owner, and operator of Lawn Phix. With a passion for lawn care and turf nutrition for over a decade, I've dedicated countless hours to correcting soil and perfecting lawns. Today, my expertise, backed by formal courses at UMass Extension Pesticide Education, allows me to offer top-tier lawn care services and advice. I am a fully licensed and insured lawn care applicator in Massachusetts, specializing in comprehensive turf nutrition, weed control, and lawn pest control. My license number is AL-0053865. Contact me at [email protected] or +1 (508) 500-8402.

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