5 Ways to Save Potatoes From Scab

5 Ways to Save Potatoes From Scab

It often happens that from some season potato tubers become more and more covered with rough ulcers every year, they are worse stored, and when cleaning them, a lot of waste is obtained. Moreover, despite all the efforts of the gardener, every year the problem only worsens. And the blame is a scab. How to get rid of this potato disease?


Let’s start by analyzing the site where such potatoes were harvested: what varieties were grown there before, where they were brought from and how they got to the garden. Most likely, with one of the next planting material of a rootless variety, one of the types of this common potato disease penetrated. There are many varieties of scab, but the methods of spreading the infection are the same for everyone – planting tubers and soil from the site where infected plants were planted at least once. Potatoes could be successfully grown for many years in one place if pathogens had not settled in the soil. Unfortunately, scab soil is not easy to cure. So how to protect your crop?

Careful Selection and Processing of Tubers

Effect: protection of tubers from pests and diseases; yield increase; improvement of taste; extension of storage periods.

Every year, for planting, select only healthy (at least by sight) tubers and, with a view to prevention, treat them with Prestige. Before the flowering period of potatoes, it will protect the tubers from wireworms, bears, and larvae of the raspberry, as well as a number of fungal diseases, including some types of scab and late blight. But after flowering potatoes, the concentration of protective substances in the tissues of the plant becomes too low to stop pests and suppress diseases.

You can reduce the risk of potato disease using EM technology. So, pre-planting treatment of tubers with biological preparations (especially in combination with regular watering) heals the soil well, increases crop productivity, and also improves the taste and keeping quality of tubers during storage. It is necessary to apply to this agricultural technique annually. Preplant treatment with Topsin M and Fundazole also effectively reduces the incidence of potato tubers.

Use of Scab Resistant Varieties

Effect: The ability to grow a healthy potato crop in the infected area.

If the soil in your garden has nevertheless been infected with the scab, and you have no other place to plant potatoes, you just have to look for varieties that are resistant to scab. For example Romano, Panyanka, Saturn.

Follow Growing Rules

Effect: avoid conditions that contribute to the activation of the pathogen; prevent the development of the disease during the growing season.

Increased soil moisture contributes to the active spread of scab if at the same time disturbed soil aeration. Acidity is also an unfavorable factor: the higher this indicator, the more active the pathogen. If the soil is rich in humus, the causative agent of the common scab will not threaten it. Conversely, fresh organic fertilizer and undecomposed plant debris contribute to the development of the disease. A mandatory method for preventing scab is crop rotation – it is undesirable to plant potatoes in the same place for several years in a row since the pathogen spores and substances that contribute to its development accumulate in the soil. At the same time, the best precursors for potatoes will be winter crops, green manure (soy, vetch, rape, mustard).

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