How to prevent potato scab

The pathogen of potato scab is Streptomyces scab, which is an actinomycete, which mainly harms potato tubers. It produces brown spots on the surface of the tuber, and expands to form a brown round or irregular large plaque, which is rough in texture. Usually, although the lesion is limited to the cortex, the quality and yield of the damaged potato can still be reduced, and it is not resistant to storage, and the appearance of the diseased potato is indecent, and the grade of the commodity is greatly reduced, causing certain economic losses. There is a difference in disease resistance between varieties, white thin skin varieties are susceptible to disease, and brown thick skin varieties are more resistant to disease.

Hazard Symptoms Potato tubers have a small brown spot on the surface that expands to form a brown round or irregular large plaque. Due to the large surface of the cork-forming cells, the surface is rough, and the central part is slightly depressed or bulged in the form of a sore-like hard plaque. The lesion is limited to the skin, not deep into the potato, unlike the whitefly disease.

Pathogens are spoiled in the soil or overwinter on diseased potatoes. Before the early epidermis of the tuber grows, the pathogen enters the disease after invading from the lenticulus or wound. When the surface of the tuber is corked, it is difficult to invade. Plants grown from diseased potatoes are highly susceptible to disease, and healthy potatoes can also be found in the soil with bacteria.

The onset condition is suitable for the occurrence of the disease at a temperature of 25 ° C ~ 30 ° C, neutral or slightly alkaline sand loam weight, the pH value below 5.2 rarely occur. There is a difference in disease resistance between varieties, white thin skin varieties are susceptible to disease, and brown thick skin varieties are more resistant to disease.

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