Beets With Powdery Mildew – Treating Powdery Mildew In Beet Plants


By: Mary Ellen Ellis

The earthy, sweet flavor of beets has captured the taste buds of many, and growing these tasty root vegetables can be so rewarding. To enjoy your beet harvest, know how to recognize this disease and how to combat it.

Symptoms of Powdery Mildew on Beets

The sooner you detect signs of powdery mildew on beets, the easier it will be to control and treat it. An early sign of the disease, which is caused by a fungus that only grows on beet and chard plants, is the formation of small white spots on the undersides of older leaves.

Eventually the white, powdery substance will spread to all areas of the leaf and to all leaves on the plant. You may also start to see dark spots on the leaves. It can take just a week for powdery mildew in beet plants to spread to all the leaves.

How to Treat Powdery Mildew

Powdery mildew is a bigger issue for farmers raising sugar beets than for the average backyard gardener. The disease will not necessarily limit your beet root harvest, but it can limit sugar content, which is problematic for the yields on farms. Still, it’s best to get the disease under control in your garden if you spot it.

Beets with powdery mildew can be treated with a fungicide. The most important consideration in treating the infection is timing. It is much easier to control it in the early stages than when the disease has become widespread among your beet plants. You can also take steps to prevent powdery mildew on beets in your garden. Surface irrigation keeps the lower leaves of beet plants moist, which encourages fungus growth. Water your beets with a sprinkler from above instead, preferably early morning, giving the plant leaves plenty of time to dry.

Powdery mildew in beet plants can become an insidious infection. Keep conditions right to prevent the growth of fungus and, if necessary, visit your nursery to get a recommendation for a fungicide and take care of the infection as soon as you see it taking root.

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Identifying Powdery Mildew

Photo credit: Wikimedia Commons

The most obvious sign of infection is the appearance of a powdery, white dust on plant leaves. This may only be a small patch to begin with, but it will grow steadily.

Powdery mildew is sometimes confused with the similar downy mildew. However, downy mildew appears only on the bottom (or underside) of the leaf. In contrast, powdery mildew will appear anywhere on the leaf. Take note that downy mildew isn’t as powdery in appearance, either.

If untreated, the small white spots will grow, forming a root-like structure. This saps the plants leaves of nutrition and also prevents photosynthesis. As the fungus takes hold, the plant’s leaves will turn yellow and fall off.

Leaf loss in this manner will cause the plant stress, meaning that it will fail to flower or fruit. The plant will also stop growing, so you’ll have to remove it from your garden.

Additionally, the fungal spores are spread on the wind or by visiting pollinators. Needless to say, this can be a particular problem if you grow lots of pollinator-friendly flowers. Without prompt action, powdery mildew can wreak havoc in your yard.

Luckily, powdery mildew is not only easy to prevent, but there are also a number of effective powdery mildew treatments. If applied quickly, they’ll rid the plant of fungus and keep the rest of your garden safe.


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