Difference between Frost injury and Disease of Potato

Freezing injury: from the plant growth appearance, after the plant is frozen, the leaves and heart leaves have no disease spots, and the leaves are dark green. When the sun shines, the leaves appear to be wilted and seem to be cooked leaves. After 1-2 days, the leaf margin curled inward until withered, but the new leaves growing from the heart leaves had no symptoms of wilting. Disease: after the plant is damaged, the pathogen spreads upward with the growth of young buds, causing stem and leaf disease, forming a central diseased plant, which is transmitted by wind or soil. Obvious disease spots or spots appeared in the stems and leaves until the leaves of the plants turned yellow or even died. Effective methods to prevent and reduce frost injury are as follows: grasp soil moisture, timely irrigation, adjust soil water content and temperature, promote plant growth and enhance cold resistance. For potatoes cultivated with plastic film mulching, in addition to mastering reasonable irrigation conditions, it is more important that the opening of the broken film should not be too large after the seedlings are unearthed. When the seedlings grow to 10~15cm, the seedlings need to be pulled out of the film, and should be carried out in cloudy days, rainy days or when the shoes are not glued after irrigation, and the seedlings can not be broken at noon in sunny days, otherwise it is easy to cause freezing injury.