In the production of sweet potatoes, when you have a dangerous illness, do you know how to identify it?
First, sweet potato black spot disease
The pathogens only infect the roots of the crops. In the early stage of the infection, many irregularly colored hazel or dark purple spots are formed on the epidermis, and the black gradually becomes darker in the center of the lesions, and is slightly depressed downward. When the humidity is relatively high, the surface of the lesion will produce black mildew. The disease only invades the surface of the potato, and the plaque does not penetrate into the inside of the potato.
Second, sweet potato soft rot
Most of this disease occurs first at one end of the potato block or at the wound, and then quickly invades into the interior. The damaged part of the tissue softens, the epidermis is brown, and when it breaks, there will be a yellow juice flowing out with a fermented wine aroma. At the end of the disease, the epidermis turns into a dark brown with a mildew. When the humidity is relatively large, a layer of grayish white hair will grow on the surface of the potato skin, and many small black spots will be densely covered on the hair. In the case of dry weather, the outer layer of the diseased potato is intact and mold-free, but it will be fast due to moisture. Disappeared, and finally became a rigid block of internal dry rot.
Third, gray mold
The potato chips are easily damaged by freezing in the kiln. The potato inside the affected potato pieces turns brown, slightly soft and rotten, unlike the soft rot. Longitudinal cut potato can see a lot of dark brown lines, you can see a lot of dark brown or black dots when crossing the diseased potato. Gray mold is grown when the temperature in the local pupa is above 17 degrees Celsius or when the diseased potato is placed at 17 degrees Celsius to 20 degrees Celsius.
Fourth, physiological diseases
It is mainly caused by freezing damage. When the temperature is below 9 degrees Celsius, the potato pieces will be frozen. When it is lighter than freezing, it is often not seen on the outside, but it has deteriorated in the interior; when it is heavier than freezing, it shows water stains, and the cut surface does not see the white juice flowing out, and the cooking is not bad, forming a hard heart.
Five, sweet potato black star disease
This disease mainly affects the stem and leaf parts of the crop. Leaves that are infected with the disease will initially produce dark brown or black infiltrated round spots on the leaves. These spots will then expand slightly, gradually fade and fade in the center, turning into spots with light brown or brown outlines. There are often irregular corners around the lesions, and there are inconsistent patterns on the front. When there are more lesions, the leaves are prone to yellowing and falling off. The stem and petiole are partially infected with the disease, and the lesion has a long elliptical shape with a slight depression in the middle, and the color is similar to the leaf lesion.
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