What is the disease of black spots on white radish?

Disease name]: radish black spot disease.

Symptom characteristics]: Mainly harmful leaves. The leaves are initially black-brown to black with slightly raised small round spots, the later enlarged margins are pale, the center is light brown to gray-brown lesions, 3-6 mm in diameter, and the concentric whorls are not obvious.

When the humidity is high, pale black mold grows on the lesions, that is, the conidia and conidia of pathogenic bacteria. The diseased part is brittle and easy to break. If the disease is severe, the confluence of the lesions will cause local death of the leaves.

Leaves, stems, and pods can all be diseased. The lesions on the stems and peduncles are mostly black-brown oval patches.

Pathogenesis]: Pathogenic bacteria with hyphae.

or conidia survive on diseased leaves and are the primary source of infection throughout the year. In addition, there are hyphae lurking in the germ tissue of diseased radish seeds, which invade the roots when the seeds germinate. The onset of the disease is 25 at a moderate temperature, with a maximum of 40 and a minimum of 15.

Prevention and control methods]:

1) Choose black spot resistant varieties such as Tianzheng Qiuyu No. 1 radish.

2) Large-scale crop rotation, turning over the land in time after harvest, cleaning the pastoral, and reducing the source of bacteria in the field.

3) Increase the application of fully decomposed organic fertilizer, strengthen management, and improve the disease resistance and disease resistance of radish.

4) Seed disinfection, seed dressing with 50 Fumei double wettable powder or 75 Dakonine wettable powder, or 50 iprodione wettable powder with seed weight 0 4. (5) Pharmaceutical prevention and control. The fungicides that are effective against melanoma-induced by Alternaria are:

75 chlorothalonil wettable powder 500-600 times, 50 iprodione wettable powder 1000 times, 58 methalin-manganese-zinc wettable powder 500 times, 80 mancozeb.

WP 600 times liquid. The best time to prevent and treat the disease is to start taking medication before the onset of the disease. Once every 7-10 days, 3-4 times in a row. Mancozeb can only be sprayed once per growing season to prevent manganese ions from exceeding the standard.

If there are black spots on the skin of the radish, it may be caused by the environment during storage, and it will not affect the consumption of the radish. If there are black spots on the flesh of the radish, it is recommended not to eat it. 4.

White radish should be eaten raw, but it should be noted that it should not be eaten within half an hour after eating to prevent its active ingredients from being diluted.

Black spots on white radish, if there are black spots on the epidermis, it may be caused by the environment during storage, this does not affect the use, if there are black spots on the flesh under the skin, this is not recommended.

From the ** point of view, the light soil color on the radish is not like a disease, if the skin is peeled with a knife, there are no traces inside, it should be a slight injury caused by contact with the soil during the growth and expansion of the radish, and it does not hinder eating.

1. The blackening of white radish is more complicated, it may be the corruption caused by the inside of the white radish, or it may be that the radish is old, and the aging reaction is generated, no matter what the reason is, as long as there is a blackening reaction inside, it is not recommended to use it again.

2. In addition, white radish will lose water if it is cut for a long time, and there are many pores in the structure of the radish, which will cause it to look dark and black after a long time of water loss, which is a natural phenomenon.

Cutting off the blackened part is still edible.

White radish has black spots because it has deteriorated due to improper storage, keep the method:

1. Soil pit storage: remove the top and roots of the white radish, if there is a wound or crack of the radish needs to be removed, and then almost prepare a one-meter-high and one-meter-wide soil pit, put the processed radish in, the root is up and the top is leaning down on the pit wall, and then the soil pit can be sprinkled with soil. If the pit is too dry, you can add some water to moisten it.

2. Water tank storage: Prepare a clean water tank, then fill it with water, then add the cleaned radish to the periphery of the tank, and then cover it with wet soil.

3. Refrigerated preservation: Wrap the processed white radish in white newspaper and place it in the refrigerator or cold storage for about a week.

4. Freeze preservation: first peel the white radish and cut it into uniform pieces, then add it to the fresh-keeping bag and put it in the refrigerator to freeze.

5. Cooking and freezing: In order to save the time of the next stewing, the white radish can be frozen after cooking, or it can be stored together with the stewing juice, so that it can be eaten directly after being taken out and heated when eating, which saves time and effort, and is more convenient.

If there are black patches on the surface, it should be mold, but as long as you peel the good inside and remove the black area, you can still eat it.

Because it has been put for a long time, it is a little moldy.

How to preserve white radish:

1. Mud storage method.

Peel the top of the radish, put it in the yellow mud and roll it around to make the radish form a layer of mud shell, and stack it in a cool place. It is even better if you cultivate another layer of wet soil outside the radish pile.

2. Storage method outside the water tank.

Put a water tank indoors, fill it with water, stack the radishes around the tank, and cultivate 15 cm of wet soil on top.

Oxidized. In the refrigerator, the middle part of the radish may turn blue.

That's because radishes are parasitic and infectious.

It is recommended not to eat blackened white radish, because after blackening, white radish will produce some bacteria and toxins, which is not only not good for the body, but also may be poisoned.

It is recommended not to have black spots on white radish, because after turning black, white radish will produce some bacteria and toxins, and it is not good for the body after eating the core with oranges.

Radish is a fleshy root, whether it is a germ that invades the peel, root or heart, it will cause small black spots, that is, black flowers.

White radish is a common vegetable, which can be eaten raw or cooked, and its taste is slightly spicy. Modern research believes that white radish contains mustard oil, amylase and crude fiber, which has the effects of promoting digestion, enhancing appetite, increasing and improving gastrointestinal peristalsis, and relieving cough and reducing phlegm.

The reason for the blackening inside the white radish is that the radish has gone bad. The black inside of the white radish indicates that the inside of the radish has begun to rot and deteriorate, and this radish is inedible and needs to be discarded immediately. The inside of a normal white radish should be as white as jade, and you should pay attention to the weight and appearance of the radish when choosing to avoid buying bad radish.

The reason for the blackening inside the white radish is that the radish has gone bad. The black inside of the white radish indicates that the inside of the radish has begun to rot and deteriorate, and this radish is inedible and needs to be discarded immediately. The inside of a normal white radish should be as white as jade, and you should pay attention to the weight and appearance of the radish when choosing to avoid buying bad radish.

Summary. Hello, dear, it is a pleasure to serve you, and it is revealed through official inquiries that it could be: radish black rot.

It mainly damages leaves and roots. The leaves are infected, and the leaf edge shows a "V" shaped lesion, the leaf veins turn black, the leaf edge turns yellow, and then expands to the whole leaf. The root infected duct turns black, the internal tissue is dry rot, and the appearance is often not obvious, but the pith is mostly black and dry rot, and then a cavity is formed.

The field is often complicated by soft rot, and eventually becomes rotten.

Hello, dear, very high to serve you, through official inquiries, it may be: radish black rot. It mainly damages leaves and roots.

The leaves are infected, and the leaf edge shows a "V" shaped lesion, the leaf veins turn black, the leaf edge turns yellow, and then expands to the all-knowing Zhao dull leaves. The root infected duct turns black, the internal tissue is dry rot, and the appearance is often not obvious, but the pith is mostly black and dry rot, and the posterior shape is hollow. The field is often complicated by soft rot, and eventually becomes rotten.

What drugs can be used to prevent it.

Hello, dear, Agricultural control: clean the field in time, sow seeds when it is suitable for impulse, water reasonably, and avoid excessive soil moisture. Pharmaceutical prevention and control:

As a disease pre-dispersed branch prevention or in the early stage of the disease, you can choose to use 47% Chunlei Wang copper (2% Chunlei + 45% Wang copper) wettable powder (Garinong) 800 1000 times solution, or 77% copper hydroxide wettable powder (can kill) 500 800 times solution, or 50% chlorobromoisocyanuric acid soluble powder (extinguishing homogenization) 600 800 times liquid and other agents to spray evenly, once every 7 10 days, 2 3 times in a row. Pay attention to the rotation of the agent.

The prevention and treatment of pharmaceuticals implements the principle of "prevention first, comprehensive prevention and control", and rationally selects pharmaceuticals. After winter shearing, spray Baume 3 5 degree stone sulfur mixture solution in time to clear the garden. Drugs in the growing phase:

It can be chemically controlled with 1000 1500 times of 50% promethane wettable powder. In the early stage of the disease, 750-1000 times of 6% gangpyrin can be used for liquid spray control, and 45% prochloraz isodidione 1000-1500 times liquid spray can be used in the later stage.

Strengthen cultivation management: We can increase the application of organic fertilizers to promote the growth of plants and improve disease resistance. For low-lying or poorly drained orchards, we need to do a good job of drainage.

Increase the application of organic fertilizers and microbial fertilizers such as farm fertilizers, and use fast-acting fertilizers scientifically in proportion to promote the growth of trees and improve their disease resistance. Orchards with low-lying terrain and poor drainage should be drained in time.

In the growth period of fruit trees, generally after flowering to young fruit stage, that is, in late April to early July spray protection, the following agents can be used: 65 dycob zinc wettable powder 500-600 times liquid; 75 chlorothalonil wettable powder 800 times liquid seed treatment; The selection of seeds should be based on the local climate, soil texture, and disease occurrence to select excellent varieties with strong disease resistance and disease resistance; Before sowing seeds, soak them in warm water at 55 degrees Celsius for half an hour, remove them and dry them before sowing.

Strengthen cultivation management and non-cruciferous vegetables alternate year rotation, deep ploughing, remove disease residues, you can add an appropriate amount of quicklime to mix the chicken, the first can improve the soil, the second can kill a lot of germs. Of course, you can also buy agricultural disinfectants for dilution and disinfection, proper fertilization, this situation is probably a lack of calcium, so in order to avoid this situation, it is necessary to fertilize properly, supplement calcium in time, and use fertilizers at different stages in different growth periods to ensure that the fertilizer is sufficient for large-scale crop rotation, and the land is cleaned in time after harvest to reduce the source of bacteria in the field.

It can be controlled in this way: large-scale crop rotation, timely turning over the land after harvest, cleaning the field, and reducing the source of bacteria in the field. Seed disinfection:

Seed dressing with 50% Fumei double wettable powder, 40% sterilized Dan wettable powder, 50% sterilized urea wettable powder, and 50% iprodione wettable powder with seed amount. Pharmaceutical prevention and control: spray 20% thiohedrone 500 times, 75% chlorothalonil wettable powder 500 600 times, 50% sterilized urea wettable powder 1000 times, 58% methamalene manganese zinc wettable powder 500 times, 50% Pythium wettable powder 1500 times, 40% sterilized Dan wettable powder 600 times, 80% spray gram wettable powder 600 times, every 7 10 days for prevention and control, continuous spraying 3 4 times.

You can strengthen field management, loosen the soil, apply more fertilizer, and then clean up the plant disease and residue in time, so as to prevent the occurrence of this disease.

Choose excellent disease-resistant varieties. Reasonable crop rotation and strengthen field management. Timely loosening of soil and top dressing, delaying leaf senescence and promoting root growth; Clean up the plant disease residue in time to reduce the source of disease in the field; Reasonable irrigation, timely drainage after rain, increase air circulation between plant rows, reduce soil and leaf moisture, and reduce pathogenic transmission conditions.

Before sowing, the seeds were treated by warm soup soaking method, or 50% Fumei double wettable powder by seed weight, or 40% seed dressing double powder, or 70% mancozeb, 75% chlorothalonil, 50% prodidione wettable powder were used to dress the seeds. At the beginning of the disease, spray 2000 times of 30% etherstrobin suspension, or 600 times of 75% chlorothalonil wettable powder, or 500 times of 78% wave manganese-zinc wettable powder, 600 650 times of 80% mancozeb wettable powder, and 1000 times of 50% iprodione wettable powder, spray once every 10 days or so, and continuously control 3 4 times.