What causes white spot disease when growing spinach? What to do?

Grower Zhang said: If this spinach has white spots, don't sell it with half a bowl of water, and sell it with your sleeve. Nobody wants to.

Most of them are handled at a low price. Tell me why the white spots of this spinach are long? Can it be prevented?

I don't think I can't buy spinach anymore this year. Spinach white spot disease mainly affects spinach leaves. In general, the lower lobe is the first to develop, the mole is nearly round, the middle of the mole is yellowish-white, the edge is distinct, the outer edge is brown or gritty, and then gradually becomes a white spot.

At this time, if the humidity is too high, gray hairs may appear on the stain. After the humidity gets wet to the drying chamber, the signs are ruptured from the middle.

Spinach white spot is a fungal disease that is spread by wind and rain. Generally, spinach is prone to disease in weak growth, warm and humid conditions. The terrain is relatively concave, and the disease is more severe in the spinach plots that are not properly managed.

Before planting spinach, choose plots with flat terrain, fertile soil, and good ventilation. Reasonable water and fertilizer management during the planting processWhen spinach has symptoms of white spot disease, growers must use medicine in time. Generally, it is 1000 times of 50% multifungal humidifying powder or 700 times of 75% multifungal humidifying powder, which is generally sprayed once every 10 days, twice in a row.

The temperature is still low in early spring, and the lighting time is not good in the later stage, and leafy vegetables are prone to sprouting, so when choosing varieties, it is necessary to choose varieties that are not easy to sprout. Plots planted should go beyond plots of vegetables that are not planted with cruciferous flowers, and dig deep in time after the harvest of previous stumps to remove residual root weeds. In early spring, when the soil spreads out on contact after thawing, 2000 kg, 25 kg of urea, 10 kg of potassium fertilizer are coated with sugar-free corrosive organic fertilizer, and then prepared for sowing with shallow tillage.

The temperature of spinach is relatively low when it is sown in spring, and if the seeds do not germinate before sowing, it will take at least half a month to germinate after sowing. Take the method of soaking germination, first soak in warm water for 5 hours, take it out and dry it, put it into a greenhouse environment of 25 degrees to germinate, usually sow for 2 3 days, greatly shorten the germination time, and promote the seedlings to grow well. There are many ways to sow spinach.

Wet sowing is most common in early spring. Pour water on the soles of your feet, soak in the water, then cover 1 cm.

Because the temperature is low in early spring. Therefore, it is better to cover it with plastic film once after sowing. This provides excellent warming and moisturizing.

Please note that the buds should be peeled off or small arches made in time after they are unearthed. The purpose of this is to allow the seedlings to see more light, prune the seedlings more, burn the seedlings for the high temperature, and at the same time allow the small arcade to uncover the night cover during the day, revealing a clear rain cover. Wet spring spinach soil moisture is abundant, so usually pour water once when 2 or 3 true leaves are grown, watering according to soil and climate change.

During the second watering, 15 kg of elements per mu of radish per water are discharged, especially the fast-acting nitrogen fertilizer is applied one month before harvest.

It may be that the spinach is not replenished with nutrients in time, or it may be the soil relationship, there are some pests and diseases to eat, etc., usually pay attention to observe the growth of spinach, and fertilize in time to replenish water.

White spot is a fungal disease, wind and rain will spread, spinach planting place if uneven is prone to this disease, the growth of relatively weak spinach is also prone to this disease, you can spray spinach 50% fungal humidification powder, spray once in about ten days, spray twice.

This is mainly due to the fact that the spinach is not turned and disinfected after harvesting, which leads to the spread of the infection after the germ is latent in the soil. This requires us to do a good job of cultivating the soil and weeding in time, especially to carry out a comprehensive disinfection of the soil before planting, so as to reduce the probability of spinach white spot disease.

The main symptoms are manifested in the leaves, the lower leaves are the first to develop, the lesions are round to nearly round, the edges of the lesions are obvious, the size is millimeters to millimeters, the middle of the lesions is yellowish-white, the outer edge is brown to purple-brown, and the white spots gradually develop after expansion. When the humidity is high, gray hairs can be seen on some lesions; When the change of dry and wet is intense, it is easy to rupture in the lesions**. Prevention and control methods.

1. Choose a flat terrain and a ventilated plot with sufficient organic fertilizer to plant spinach, properly water, fine management, and improve plant disease resistance.

2. Clean up the sick and remnants in time after harvesting, and bury or burn them in a concentrated manner to reduce the source of disease.

3. In the early stage of the disease, spray 400-500 times of 30% green debao suspension, or: 160 times Bordeaux liquid, 75% chlorothalonil wettable powder 700 times liquid, 50% multi-mold.

The spinach white spot fungus overwinters in the soil with the mycelium and the diseased residues, and spreads through wind and rain in the next spring. It is easy to develop disease under weak growth potential, warm and humid conditions, and severe disease is caused by low-lying terrain, nest wind, and poor management. 1. Reasonable crop rotation, timely crop residue and leaf loss, take out the field to bury and burn; and spray the ground with a new high-fat film 800 times to treat the soil; Before sowing, the new high-fat film should be used to dress the seeds, and the seeds should be sown in a timely manner, and then the new high-fat film should be sprayed to keep the surface insulation and moisture to improve the seedling emergence rate.

2. Strengthen field management, and timely seedlings and field weeds; watering to reduce ground temperature; Spray organic fertilizer, achieve the combined application of nitrogen, phosphorus and potassium, and spray strong stems in a timely manner in the growth stage of spinach, so that the plant stems are thick and the leaves are hypertrophied, improve the disease resistance of spinach, reduce the amount of pesticides and fertilizers, reduce residual toxicity, and improve the natural taste of spinach.

Spinach is a very ordinary home-cooked dish, and now in this snowy season, it is really a very pleasant thing to put a shabu-shabu at home, wash some spinach and Chinese cabbage, and then eat a small hot pot with meat and vermicelli. But today we are not talking about eating, but about planting, there will be a lot of pests and diseases in the process of planting spinach, what good ways do we have to prevent and control, is the key to planting good spinach to eat in shabu-shabu.

<> pathogenesis: the pathogen of double mold disease is mainly overwintered on autumn-sown spinach or overwintering vegetable plants and seeds, and in the second year, under suitable climate conditions, it will spread with the help of airflow, and the disease is generally more serious in the environment of low temperature and high humidity.

Control technology: reasonable dense planting, appropriate watering, do not flood irrigation. Choose disease-free seeds, soak them in warm water at 50 degrees Celsius for 20 minutes, then remove them and immediately cool them in cold water, so that they can be dried before sowing.

Ventilation of spinach fields is strengthened to reduce humidity. If the onset is not particularly serious, you can use 500 times of 25% bromonitrile wettable powder, spray once a week, spray two or three times in a row, and the effect can be seen.

The symptoms of spinach leukoplakia are mainly manifested on the leaves. The lower leaves are the first to develop the disease, the lesions are round to nearly round, the edges of the lesions are obvious, the size is millimeters, the middle of the lesions is yellowish-white, the outer edge is brown to purple-brown, and gradually develops into white spots after expansion. When the humidity is high, gray hairs can be seen on some lesions, and when the dryness and wetting change are intense, the middle of the lesions is easy to rupture.

The appearance of this symptom is caused by the infection of cercospora beet.

It mainly harms the leaves, and the pale green dots on the leaf surface at the beginning of the disease develop into pale yellow lesions, which later expand into irregular lesions, and the leaf dorsal lesions are covered with white mold. The lesions extend upwards from the lower part of the plant. The diseased leaves wither yellow during drought, rot when wet, and all the leaves turn yellow and die when they are severe.

Leaf disease. The initial pale yellow spots, after enlargement, the lesions are oval or irregularly shaped, yellowish-brown, and have a ring pattern, the edges are water-stained, ** there are black dots.

You can spray a lot of pesticides in advance, which can also ensure the quality of spinach, and in the process you need to water and fertilize a lot to ensure a higher yield.

It can be controlled by pesticides. Some pesticides can prevent white spot disease in spinach.

Field management should be strengthened, and time seedlings should be removed, and weeds in the field should be removed; In addition, in summer, it is necessary to water to reduce the ground temperature, reduce the amount of pesticides and fertilizers, reduce residual toxicity, and improve the natural taste of spinach.

Reasonable crop rotation, timely sowing after soil disinfection, spraying the soil surface with a new high-fat film for sowing, seeding seedlings after emergence, and reasonable fertilization to improve plant disease resistance.

White spot disease is a common disease in the growth and development of spinach, which mainly harms spinach leaves, and can cause spinach to die in severe cases. This disease is caused by fungi and can spread through wind and rain, so it is most likely to develop in warm and humid conditions.

1. Strengthen management and improve plant disease resistance;

2. After harvesting, remove the sick and residual bodies in time, and bury or burn them in a concentrated manner to reduce the source of disease.

It often spreads with the help of wind or rain, and slowly spreads, and the plants are prone to wilting when encountering such conditions, so what should be done at this time is to prune these changed spinach.

Reasonable crop rotation, timely removal of the previous crop residue and leaf litter, take out of the field for deep burial and burning; and spray disinfectant on the ground with 800 times of new high-fat film to disinfect the soil; Before sowing, the new high-fat film should be used to dress the seeds, and the seeds should be sown in a timely manner, and then the new high-fat film should be sprayed to keep the surface insulation and moisture to improve the seedling emergence rate.

Strengthen field management, seedlings should be removed in time, and weeds in the field should be removed; watering to reduce ground temperature; Spray organic fertilizer, achieve the combined application of nitrogen, phosphorus and potassium, and spray strong stems in a timely manner in the growth stage of spinach, so that the plant stems are thick and the leaves are hypertrophied, improve the disease resistance of spinach, reduce the amount of pesticides and fertilizers, reduce residual toxicity, and improve the natural taste of spinach.

To prevent and control the disease, it is necessary to ventilate and reduce humidity in the greenhouse, especially after watering, so as to reduce the humidity in the shed. In addition, it is necessary to carry out pesticide prevention and control, and spray 600 times with 72% gram dew 600 times in the early stage of the disease, once a week, 3-4 times in a row. Spray 500 times of 53% refined nail cream, manganese-zinc water-dispersible granules, 500 times of 70% ethylphosphine-manganese-zinc wettable powder, 800 times of 72% frost urea, manganese-zinc wettable powder or 800 times of downy mildew carb hydrochloride aqueous agent, 7 10 days for 1 time of prevention and control, 2 3 times of continuous control.

In the long sunshine through the light stage, it is easy to sprout in advance, so when planting in spring, it is necessary to choose varieties with strong heat resistance, not too early when sowing, and it is advisable to plant when the local average daily temperature is stable above 10, which can avoid the long-term impact of low temperature in rabbits and reduce the occurrence of early sprouting. The optimal growth temperature of spinach is 20 degrees, which is not resistant to high temperatures, and once it is higher than 25 degrees, it will grow poorly, with small and few leaves, declining quality, and it is easy to sprout. The reason for spinach sprouting, spinach itself does not like to grow at high temperatures, and it is easy to have short leaves and poor quality when growing at high temperatures.

Increase soil fertilizer and water: apply foot fertilizer before sowing, chase thin human manure at the seedling stage, increase the concentration when the plant is larger, and do the seedling once fertilized to ensure strong seedlings. It is a nutritious leafy vegetable.

Spinach has wide adaptability, all over the north and south of our country are planted, due to the wide adaptability, short growth period, planting economic benefits are considerable, some vegetable farmers grasp the business opportunities, the use of greenhouse production, all year round to plant.

Avoid the long sunshine and high temperature season, the summer solstice is generally the longest day and shortest night season of the year, the temperature gradually rises, and it is easy to sprout spinach in advance. Planting is usually done in September. Too arid.

Spinach cannot be short of water, because it is a green leafy vegetable, which has high water requirements, and cannot be drought, and drought will stop growing and premature senescence and sprouts. Water frequently, in small amounts and often.

First of all, it is necessary to choose varieties of high-quality and disease-resistant seeds, pay attention to sowing in turns, and fertilize in time.

We must carry out crop rotation every other year, and clean up some diseased spinach in time, and we must pay attention to ventilation.

I think that the white rust of spinach is the main disease of spinach, and if we want to better control it, we should take timely measures to spray the drug on the surface of spinach.

Spinach is one of the common vegetables that live in life and is more widely cultivated in my country. For farmers who grow spinach, spinach is a disease that occurs during the growth process, which seriously affects the quality and production of spinach and reduces the benefits of planting for farmers. The following popular agricultural material networks provide you with the symptoms and prevention methods of spinach white heart disease, hoping to help farmers better prevent the disease.

Symptoms of spinach:

The symptoms of spinach leukocyte rate are mainly manifested on the leaves. In the case of the lower leaf round, the lesion is round, the lesion is pronounced, the size is, diarrhea is white in the middle, the outer edge is brown, gradually evolving and expanding. When humidity is high, certain gusts of wind are visible at the site, and when the change in dryness and wetness is intense, the middle of the lesion tends to rupture.

The appearance of this symptom is caused by a beet taidin infection. This harm to beets is also harmful to sugar beets, which leads to similar symptoms. Spinach white spot bacteria with hyphae in the soil diseases in the soil, spring diseases are borrowed, and the rain spreads.

Weak growth, easy to develop, low terrain, low trend, poor management.

Spinach eyelash prevention and ** method:

1. Reasonable wheels, timely, crops, grooves, leaves, bring out the bottom buried and burned; and adding the drug to the ground, adding a new high-fat membrane 800 times to treat the soil; A new high-fat film mix is sown, pathogenic seeding, and then adheres to the surface insulation of the new high-fat film to increase seedlings.

2. Strengthen on-site management, time seedlings, and wild weeds; Watering lowers the temperature of the land; Spray organic fertilizer, do nitrogen, phosphorus, potassium, spray strong stems in the growth stage of spinach, make plant stems rough, leaf fat, improve spinach disease, reduce the amount of pesticide fertilizer, reduce residues, and improve the natural taste of spinach.

3. For prevention and first drugs, the initial stage of the disease should be sprayed 75 times of bacterial transparent wettable powder, 50 times of polymer wettable powder 1000 to 1500 times of liquid, etc., 7 to 10 days 1 time, sprayed 2 to 3 times; And mix with the new high-fat membrane 800 times to enhance the effect.