Differences Between Potato Frost Damage and Disease and How to Identify Them
Frost damage: Judging by the plant's outward appearance, after the plant is frozen, the leaves and heart leaves show no lesions, and the leaf color is dark green. When exposed to sunlight, the leaves appear wilted, as if they had been boiled. After 1 to 2 days, the leaf margins curl inward until they wither and crumble, but the new leaves growing from the heart leaf show no wilting symptoms. Disease: After the plant is affected...
Frost damage: Judging by the plant's outward appearance, after the plant is frozen, the leaves and heart leaves show no lesions, and the leaf color is dark green. When exposed to sunlight, the leaves appear wilted, as if they had been boiled. After 1 to 2 days, the leaf margins curl inward until they wither and crumble, but the new leaves growing from the heart leaf show no wilting symptoms.
Disease: After the plant is affected, the pathogen spreads upward along with the growth of young buds, causing disease in stems and leaves and forming a focal diseased plant, spread by wind or transmitted through the soil. Stems and leaves show obvious lesions or spots, until the plant's leaves turn yellow and may even die.
Effective methods to prevent and reduce frost damage: Manage soil moisture, irrigate at the right time, regulate the water content and temperature in the soil, promote robust plant growth, and enhance cold resistance. For potatoes grown under plastic film mulch, in addition to maintaining reasonable irrigation conditions, what is even more critical is that after the seedlings emerge, the opening made in the film must not be too large. When the seedlings grow to 10-15 cm, the seedlings need to be pulled out through the film, and this should be done on cloudy days, rainy days, or after irrigation when the soil does not stick to shoes. Do not open the film to release the seedlings at noon on sunny days, otherwise frost damage is likely to occur.