Common Potato Scab is one of the most prevalent but least controlled potato diseases. The disease is caused by Steptomyces scabies, which is present almost everywhere that potatos are grown. Usually, farmers attempt to control the disease in non-resistant potato varieties is to maintain a soil pH level between 4.9 and 5.4. The problem is that this pH range is too low for the red clover that is grown in the rotation.
Studies have shown Urea Formaldehyde Concentrate-85 might be a better way to control potato scab. Not only is this compound much more stable than just formaldehyde on its own, but it also provides a source of nitrogen fertilizer. Urea Formaldehyde Concentrate-85 also makes a great fungicide.
In studies, scab-susceptible potato varieties like the Irish Cobbler and the Chippewa were planted in soil that had been treated with Urea Formaldehyde Concentrate-85 and then evaluated at harvest time to see how many had the potato scab. The potatoes that were treated with this chemical compound were found to have fewer scabs than potatoes that were subjected to the standard method of pH control. The added nitrogen in the treated soil also provided faster germination and better growth.
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