The white rust of spinach is the main disease of spinach, how to prevent and control the white rust

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.

Downy mildew, the key to damage leaves. The lesions extend from the underside of the plant upwards. The lesions are light yellow at first, and after the increase, they are irregular, the edges are not obvious, and the gray-white mold layer is caused on the lesions on the back of the leaves.

When the lesions are more severe, the lesions are connected to each other, and the lesions become tan in the middle and late stages. When the humidity is high, it turns brown and rots, and in more serious cases, the whole leaf turns yellow and wilts.

Prevention and control methods: In the early stage of the disease, azine bacteria mancozeb, oxone and cyanide urea, frost and ethylenephosphine aluminum, propylene zinc, methyl frost mancozeb and so on can be selected. Spray with water and spray once every 7-10 days depending on the condition.

When the disease is extensive, you can choose downy mildew hydrochloride, fluopyramide, pyraclostrobin, downy mildewcarb acetphosphine phosphate, enoylmorpholine mancozeb and other water sprays, depending on the condition interval of 5-7 days.

Virus disease, which is contracted at the seedling stage, mainly appears as a bright vein or yellow-green pattern on the heart leaves, and then becomes a light green and dense two-color flower and leaf shape. Diseases are mainly manifested in the flowering leaves or heart leaves contraction, yellow leaves withering and falling off in advance or plants curling into a spherical shape. Prevention and control methods:

From the onset of the disease to the early stage of the disease, you can choose nebulizers such as ningnanmycin, pyripeptinomycin, morpholinoguanidine hydrochloride and copper acetate, and spray them once every 5-7 days depending on the condition.

Downy mildew, when the disease is severe, the plant is set out, and the roots are carefully observed, which shows that the fleshy roots are shrunk and deformed, and there are many nodular-like root knots. The upper part of the ground shows poor growth and development, short, green loss, wilting, as if lack of liquid fertilizer or withering disease, and the plant wilts when it is more serious. Prevention and control methods:

Ciliates are produced during the growth and development of broccoli, and the roots can be irrigated with avermectin and other methods, and the cultivation technique can be improved.

Stem blight, in the early stage of disease, it causes fusiform to irregularly shaped dark gray stripes on the stem, the edges of the lesions are dark brown, and the middle and late lesions often cause gray-black smaller. When the disease is more severe, the lesion surrounds the stem for a week, causing the diseased part to wither. Prevention and control methods:

In the early stage of the disease, azoxystrobin, basic copper sulfate, cuprous oxide, quinoxethox, etc. can be sprayed with water, and sprayed once every 7-10 days depending on the condition.

Spinach downy mildew, spinach white spot, spinach gray mold. Fungal diseases, beet leaf moths, these are relatively common diseases. This can be done with some medications or through pesticides.

Including gray mold, aphids, virus diseases, cabbage worms, wilt, it is necessary to use chemical agents in time to ensure the air permeability of the soil.

White spot, downy mildew, wilt, noctuida, cataplexy, must be sprayed in time, and the agent should also pay attention to the law of growth, and kill the bacteria in the soil in time.

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.

Spinach is susceptible to downy mildew when it is waterlogged in the field, the planting density is too large, and the growth is weak. In the early stage of infection, only light green and faint spots were born on the spinach leaves, which seemed to be dehydrated, and there was really no change if you didn't identify it carefully. This disease is more common in spinach planting areas, the incidence can reach 10% to 25%, and the incidence rate can reach 65% when the disease is severe, which seriously affects the yield and quality of spinach and directly affects the economic benefits of vegetable farmers.

The introduction and improvement of new varieties of spinach, although the yield is high, but the pathogens come randomly, spinach leaf spot, downy mildew. This has had a big impact on the appearance and value of spinach.

<> to overcome this problem, it needs to be governed from three aspects; Spray with methalene, manganese, morpholine, and silver farix. It is advisable to spray early, and spray from the bottom to the top with a nozzle when the blade does not completely cover the ground, spraying the back of the blade. Downy mildew infects from the dorsal of leaves.

If the early stage is well controlled, the incidence will be low and the loss will be minimized. Spraying with mildecarb and other agents, spraying with a drug according to the concentration of use when it is light, and choosing the above two compounds plus iron and zinc fertilizer when it is serious. It is advisable to spray early, and the prevention is greater than **, and it is used when the leaves do not completely cover the ground.

The sprinkler sprays from the bottom up, on the back of the blade. Downy mildew starts with high leaf humidity, that is, the relative humidity is higher than 80%, and the night temperature in the shed is lower than 8-10, and the weather with a large temperature difference between day and night will aggravate the disease. Under the recent rainy and foggy weather conditions in the suburbs of Shanghai, the management of greenhouse ventilation and light transmission is slightly improper, and spinach downy mildew mainly harms the leaves of plants, and can occur at the seedling stage and adult stage.

In the early stage of the disease, there are water-stained green spots, after expanding, they will be limited by the leaf veins to present polygonal or irregular yellow-brown lesions, and the back of the lesions becomes yellow and white causing serious losses.

Crop rotation should be implemented during planting, and reasonable dense planting, scientific water and fertilizer management, and timely drainage and humidity reduction. After the onset of the disease, Anker manganese-zinc wettable powder or alum wettable water agent was sprayed once every 6 to 8 days, and the drug was used continuously for 3 to 4 times.

Reasonable crop rotation, timely crop residue and leaf loss, bring out of 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.

Spinach downy mildew, we should take 1, strengthen field management, in planting, to be dense and appropriate, strengthen the decay of organic fertilizer, improve plant disease resistance, 2, pesticide control, in the early stage of the disease, early spray prevention and control, to achieve disease control and production.

Spinach downy mildew.

It is no stranger to vegetable farmers, because the disease will reduce the yield of spinach, and at the same time, the quality of spinach is not good enough, and it cannot be sold at a good price, so the prevention and control of downy mildew is urgent.

First, the occurrence law of spinach downy mildew.

1.On overwintering vegetable plants and seeds with pathogenic bacteria hyphae.

Overwintering or overwintering with oospores in diseased carcasses. The following spring, the sporangia will be produced under suitable environmental conditions, spreading through air currents, rain, farm implements, insects, and tillage operations. The suitable temperature for the onset of the disease is 8-10, high 24, low 3.

When the temperature is 10, the relative humidity.

85%, or the planting density is too high, and when the vegetable field is waterlogged, it will become seriously ill as soon as possible. In cold and rainy climates, disasters often erupt.

2.As the disease progresses, the pale green spots gradually expand into irregular, severe spots. When the weather is dry, the spinach leaves dry out.

Yellow. In case of wet weather or concentrated precipitation, a gray-white mold layer grows on the back of spinach leaves, and when the mold layer turns purple-gray, it means that spinach leaves have basically rotted. This is the main feature of downy mildew in spinach in the field.

3.When spinach downy mildew center disease plants appear in the field, they should be uprooted and destroyed immediately. The spinach produced in the shed should be ventilated and dehumidified in time, and the spinach that is too dense and too fine should be picked.

4.Spinach downy mildew Symptoms of Spinach downy mildew usually start from the lower leaves, with pale green waterlogged spots in the early stage of the disease with inconspicuous edges, and later develop into yellow irregular spots. When the humidity is high, a grayish-white mold layer is formed on the back of the leaf, which gradually turns dark gray.

When the greenhouse is dry, the diseased leaves gradually turn yellow and dry, and the air humidity.

When it is large, the diseased leaves become moldy. Spinach downy mildew occurs as a fungal disease caused by an oomycete. Downy mildew is easy to be induced when the temperature is low, the air is humid or the field is humid, the planting is too dense, and the ventilation between plants is poor.

It is generally severe in continuous cropping plots and overwatered sheds.

2. Agricultural control measures for spinach downy mildew.

1.Seriously ill fields are rotated for 2-3 years. Apply well-rotted organic fertilizer to improve the disease resistance of plants.

2.It is a reasonable dense planting and scientific watering to prevent flooding and the spread of diseases with the water flow. Strengthen ventilation and reduce humidity.

3.If a diseased plant infected with downy mildew is found, it should be uprooted in time and taken out of the field for burning or deep burial.

4.Sprinkle with quicklime.

Treat the planting holes to prevent the spread of germs. At harvest time, the remaining leaves are thoroughly removed and taken out of the field for deep burial or incineration. Chemical control. At the beginning of the disease, 75% chlorothalonil can be sprayed.

500 times of wettable powder, and 58% methyl frost manganese-zinc wettable powder 500 times or 69% alkene-manganese-zinc wettable powder 800 times liquid can be sprayed when the condition is severe. Spraying every 7 days, 2-3 times in a row, can effectively control the spread of downy mildew. Foliar fertilizers and plant growth regulators can also be sprayed.

Take control and get better.