How to prevent potato scab?

Potatoes, also known as potatoes, are also called taro in our hometown in Hubei, which is a very important planting project in China and has a wide range of uses. But in the process of planting, there are more diseases. In particular, potato fruits grow underground, so some lesions are difficult to detect.

Here are some common diseases so that potato growers have a certain understanding of this.

Powdered potatoes are diseased on the roots and fruits, but the affected potatoes will appear with black-brown spots on the surface and eventually crack, forming small pits of uneven shapes. When you look at the roots of potatoes at the beginning of the disease, you will find small pimples that have swelled and even been divided into pits. The concentration occurs during the rainy season.

At this time, we can spray it with 1600 times 55% benzobacteria humidifying powder for prevention**, or we can soak the potatoes in 2% hydrochloric acid solution for 2 5 minutes before sowing and sow them after a little drying.

Late blight of potatoes mostly occurs on the surface of the leaves, and gradually spreads to the potatoes over time, and the disease is more pronounced. The potato leaves at the beginning of the disease begin to appear spotted and slowly turn black brown, and when the air and soil are dry, the whole potato plant will slowly wither, and when it rains or the environment is relatively humid, it will begin to rot and stink, and eventually spread below the fruit, and the fruit will also undergo the same changes. This condition can prevent 55% methyl frost copper 750 900 times once a week for a month.

Mildew mainly damages the underground roots and tubers of potatoes, and sometimes the stems can also get sick. After the potato cubes are infected with the germ, brown pin-sized spots appear on the skin of the early potatoes, and translucent halos appear on the periphery of the spots, and with the spread of the bacteria, these small spots gradually swell, forming blisters of 3 5 mm in size, and the blisters are in the closed stage at the initial stage, and their epidermis has not yet ruptured. As the germ spreads, the epidermis of the blister breaks down, and the subcutaneous tissue turns orange, producing a lot of dark brown powder.

This dark brown powder is powdered sporangia. As the germ continues to invade the subcutaneous tissue, the blisters find a depression in a shape similar to that of a crater, outside which a halo of cork can be seen and powder enters. When the infection is severe, the blisters will join into lumps, forming large and irregular wounds, and even causing the potato lumps to be deformed, seriously affecting the mayor market value of the potato lumps.

In rhizitis disease, a solitary or regenerated white tumor the size of a soybean grain grows on one side of the root, which turns brown when mature, and is an enlargement and proliferation of infected cells. Severe root infections can lead to wilting and death of drug messages.

Powder disease is on the roots and fruits, and black-brown spots will appear on the surface of the diseased fruits, which will eventually crack and form small pits of uneven shapes, which can be prevented by spraying with drugs.

Powdery scab on potatoes is usually a soil-borne infectious disease, and clean soil can be guaranteed to prevent the occurrence of powdery crust.

The pathogen mainly overwinters in seed potatoes as dormant sporangia or overwinters in the field as dormant sporangia and becomes soil-borne diseases. The sporangium bulb lurks in the diseased potato for overwintering, becoming the first infection of the disease in the second year**, and it is also the propagation of long-distance seed potato transportation**. Dormant sporangia can survive in soil for 4-5 years.

When the environmental conditions are suitable, the sporangia in the diseased soil or seed potatoes germinate to produce zoospores, which are spread by rain, irrigation water or fertilization, invade from the root hairs, skin pores or wounds of the plant, and transfer the damage in the tuber cells, resulting in scab-like nodules. Seed potatoes were selected in disease-free fields, and disease-tolerant and high-yielding varieties were selected. The quarantine system should be strictly implemented for the seed potatoes that are transported, and the seed potatoes that fail to pass the quarantine should be sealed outside the vegetable area.

It is forbidden to transfer seed potatoes from the diseased area. Try not to miss the tubers during harvesting, and remove the diseased residues in time, take them out of the field for deep burial or burning, and reduce the source of bacteria. Choose loose soil, well-drained fields, high furrow cultivation, light watering and frequent watering on irrigation, appropriate application of grass ash and lime, change soil pH, appropriate early sowing, timely prevention and control of underground pests, promote plant growth and robustness, and enhance disease resistance.

Pink crust is a fungal disease, and scab is a bacterial disease.

Pink crust: tuber infection, small brown spots with large pinheads on the epidermis. There is a translucent halo on the periphery, and the posterior small spots gradually bulge and swell, becoming blisters with a diameter of 3 5 mm, and their epidermis has not yet ruptured, which is the closed vesicle stage of powder crust.

Later, with the development of the disease, the epidermis of the blisters is ruptured, reversed, and the subcutaneous tissue is orange-red, and a large amount of dark brown powder is emitted&40; sporangia & 41; , the blisters are sunken in the shape of a crater, and there is a cork halo on the periphery, which is a powdery crust"Open blisters"Stage. The root is infected and grows on one side of the root with a single or clustered nodule the size of a bean.

Scab disease: After the tuber is infected, small brown spots are first produced on the surface, which expand to form large brown round or irregular spots, with a diameter of 5-10mm. Due to the production of a large number of corked cells caused by rough surface, the later stage ** slightly concave or convex, scab-like hard plaques, some produce cracks, lesions are generally limited to the surface layer, not deep into the potato.

The control of pesticides is not the same.

No thanks, [smiley] [cute].