What measures should be taken for spinach downy mildew?

Spinach downy mildew is a relatively common disease, so it should be planted reasonably when planting. Scientific management, and timely dehumidification and dehumidification. It is important to keep an eye on this disease as it can affect yield and quality.

At the seedling stage, it is necessary to pay attention to reasonable irrigation and top dressing, the ratio of nitrogen, phosphorus and potassium should be reasonably matched, and timely spraying of strong stems to improve disease resistance, promote leaf hypertrophy, fresh and tender leaf color, and strong natural taste.

In the early stage of the disease, 90% ethylphosphine aluminum 800 times + potassium permanganate 1000 times + new high lipid film 500 times were sprayed alternately for 3 times to improve the control effect and reduce the use of pesticides, and change high toxicity pesticides to low toxicity and low toxicity to slightly toxicity.

1. Seriously ill fields should be rotated for 2-3 years.

2. Apply enough well-rotted organic fertilizer to improve the disease resistance of plants.

3. Strengthen cultivation management, achieve appropriate density, scientific irrigation, and prevent flood irrigation to prevent diseases from spreading with the flow of water.

It is necessary to pay attention to heat preservation and ventilation, timely weeding, and find that the diseased plants should be timely, with drugs, and can be sprayed with 25% methyl frost wettable powder to prepare 700 times of water for prevention and control, and spray once every 7 days.

Spinach downy mildew often occurs, how to prevent spinach downy mildew?

1.Seed harvesting from disease-free fields. Or use 25% methamethamine wettable powder for seed dressing.

2.In the south, it is cultivated in high chambers to facilitate drainage and ventilation. Northern and protected land cultivation takes sparse sowing and early seedlings.

Commonly used agents such as 31% methyl cream eugenol frost urea wettable powder, 45% enoylbenzylthiamine aqueous agent, 72% eugenol downy mildew carb water emulsion, 60% enoyloxystrobin water dispersible granules, 50% fluopyramide cyanoshalozole water agent, 65% pyraclostrobin cyanosmulate azoxystrobin suspension, can also be used 200 grams of 45% chlorothalonil tobacco agent per mu, smoked in a closed shed for 6-8 hours in the evening; After the occurrence of the disease, 800 times the solution of Pulik water solution or 72 frost urea can be used.

Reasonable dense planting, scientific watering and fertilization, pay attention to heat preservation and ventilation in the shed, diligent cultivation, frequent weeding, and timely cleaning of diseased plants, reduce the source of pathogens in the field, after spinach harvest, clean up the diseased plants and other sundries in the field in time, and bury them deeply or incinerate; Choose high-yield, harvest-free, disease-resistant, disease-resistant spinach seeds. Medicate the spinach seeds before sowing. Reduce primary pests and diseases.

After the spinach grows to 5 leaves, it is prophylactically sprayed with mancozeb 1:1500 times aqueous solution spray for downy mildew or sprayed with carbendazim 1:1800 times aqueous solution for prevention.

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.

In addition, the cause of the occurrence of the disease is also related to continuous cropping fields (heavy cropping fields), which often become the source of infection in the following year due to the accumulation of pathogenic bacteria, and the meristids of the pathogenic bacteria are transmitted by air currents, irrigation water, farm tools, insects, etc.

Spinach downy mildew incidence is high, causing serious losses to the yield of spinach, and it is necessary to throw away it in time if it is found to be mildew.

Spinach downy mildew is a pest and disease that occurs on broccoli caused by downy mildew infestation. Key damage leaves. Leaf disease usually occurs gradually from the lower leaves that stick to the road surface, and slowly develops upwards.

Broccoli downy mildew is produced all over the country. The key disease onset and maturity period of downy mildew of broccoli in Shanghai and the middle and lower reaches of the Yangtze River in China is from March to May and September to December, with a relatively mild occurrence in spring and a heavy occurrence in autumn from September to December.

The prevention of spinach downy mildew is dominated by agricultural and animal husbandry prevention and chemical control. The first to use disease-resistant varieties or to carry out pesticide seed dressing, you can use 75% mancozeb wettable powder seed dressing, the dose is the amount of seeds. Promote seed rotation, pay attention to onion and garlic rotation, prevent heavy cropping, and implement 2-3 year rotation in seriously ill fields.

Reasonable dense planting, immediately replenish seedlings, and improve natural ventilation and light transmittance. Scientific research on watering, draining pipes immediately after rain to avoid flooding. Clean up the pastoral scenery, find that the diseased plants are pulled out immediately, and immediately eliminate the residual and diseased leaves after acquisition, and bury or damage them outside the field.

Finally, organic chemicals are integrated to carry out prevention.

The use of disease-resistant varieties or the development of pesticide seed dressing, can be used 75% mancozeb wettable powder dressingThe dose is the seed amount. Promote rotation, pay attention to onion and garlic rotation, to prevent heavy stubble, and implement 2-3 years of rotation in seriously ill fields. Reasonable dense planting, immediately replenish seedlings, and improve natural ventilation and light transmittance.

Scientific research on watering, draining pipes immediately after rain to avoid flooding. Apply sufficient organic fertilizer, moderate fertilization, pay attention to the coordinated application of nitrogen, phosphorus and potassium fertilizer, and improve the disease resistance of the main stem. Clean up the pastoral scenery, find that the diseased plants are pulled out immediately, and immediately eliminate the residual and diseased leaves after acquisition, and bury or damage them outside the field.

Sprayer prevention should be carried out as soon as possible before or before the onset of the disease, so as to achieve the actual effect of disease control and production. Chemical fertilizers should be applied in a different way to prevent chemical resistance. To prevent downy mildew in broccoli, you can use a liquid sprayer with 600-800 times of 75% mancozeb wettable powder.

In the early stage of the disease, you can use 58% methalenemanganese zinc wettable powder 500 times, or 50% Anker wettable powder 1500 times, or downy mildew carb liquid 600-800 times, or 64% disinfectant alum wettable powder 500 times, spray up and down 1 time every 7-10 days, and spray 2-3 times in a row.

It is necessary to strengthen experience management, apply enough rotted organic fertilizer, pull out harmful plants in time, regularly use drugs for pest control, and timely drainage and irrigation.

First of all, before planting spinach, we must plough the soil, so that we can remove some pests and diseases in the soil, and you can also sprinkle some lime in the soil before planting, which can also play a role in sterilization.

You can choose to spray some pesticides on his roots, which can inhibit the growth of mold, and should also let the sun shine more, which can also kill a lot of bacteria, so it is not easy to get sick.

Downy mildew of spinach is common, which has a great impact on yield and quality. It is mainly harmful to leaves. The front of the leaf initially forms a light green dot, and then expands to a light yellow, irregularly shaped large spot with an inconspicuous edge, the back of the leaf is gray-white and then turns gray-purple mold, spinach downy mildew mainly harms the leaves of the plant, and can occur at the seedling stage and adult stage, in the early stage of the disease, it presents a water-stained faded green small spot, and after expanding, it will be limited by the leaf vein to present polygonal or irregular yellow-brown lesions, and the back of the lesion becomes yellow-white is caused by fungi, mainly harming the leaves, The initial part of the damage is light green water-stained round spots, the edge is not obvious, and gradually develops into a large yellow round lesion, the diseased leaves are yellow when drought, and a large number of purple-gray mold layers are still on the back of the diseased leaves when wet, and rot in severe cases.

Strengthen field management, the fields are cultivated in rotation, and ground spraying can be applied before plantingSoil disinfectantsEvil fungusChlorothaloniland other fungicides. Sow seeds in a timely manner, plant spacing is reasonable and reasonable, and spraying can be done in a timely manner in the early stage of growthStrong Stems, so that spinach stem thick, leaf spinach downy mildew occurrence is more common, which has a great impact on spinach yield and quality. Spinach downy mildew mainly harms the leaves, the first front leaf forms small spots pale green, pale yellow magnified, irregular edges blur large light spots, and the surface of leaf damage turns grayish-purple after occurring.

In spring, with the increase of temperature and the replenishment of water in spinach fields, coupled with the conditions of continuous rain, poor ventilation and high plant density, the reproduction of pathogens accelerated and caused the initial infection, and then the generated spores were re-infected. When the temperature is 6-20, the pathogens suitable for the disease of the strain infect a plant for the first time, and then the conidia will infect other plants, these spores can be spread with the help of air, water, agricultural tools, insects and other vectors, so after finding the disease center, it is necessary to focus on spraying, and see what are the prevention and control methodsStrengthen cultivation management, appropriate sparse planting, the use of high furrow cultivation, watering small water, strictly prohibit flood irrigation, pay attention to leakage prevention in rainy days, and use drip irrigation technology in conditional areas to better control diseasesConditional preferential application of dust agent or fog agent.

When planting spinach, you can choose some pesticides with strong medicinal properties to mix in the land where spinach is planted, so that it will play an anti-virus role, don't let the spinach field have too much water, which can also play a role in prevention and control, you go to the epidemic prevention station to buy some drugs to spray on the spinach field.

The first thing that should be done is to spray a large number of pesticides at this time, treat the environment, and water in time, so that this situation can also be prevented and controlled in time, and do not carry out a simple treatment of the surrounding weeds, so that the surrounding environment is better.

We should spray a little vinegar on the spinach, and we should spray some pesticides to prevent pests and diseases, so that it can be very good**, which is very good.

The first point is that the better prevention and control measures should actually be sprayed with pesticides, and the second point is that we should pay attention to timely watering and timely fertilization, so as to achieve a very good effect.

1.Reasonable crop rotation, timely removal of the previous crop residue and leaf loss, take out of the field to bury and burn;and spray disinfectant on the ground with 800 times of new high-lipid film to disinfect the soilBefore 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, reasonable dense planting, scientific watering, prevent flood irrigation, strengthen ventilation, and reduce humidity;In the growth stage of spinach, timely spraying of strong stems can make the plant stems thick and the leaves hypertrophied, improve the disease resistance of spinach, reduce the amount of pesticides and fertilizers, reduce residual toxicity, and improve the natural taste of spinach.

3.In early spring, it was found that the atrophic plants infected by the system were uprooted and burned in time.

4.At the initial stage of the disease, 600 times of 25% Ruifuxin WP, or 500 to 1000 times of 50% methyl tobuzin wettable powder, or 500 times of 75% chlorothalonil wettable powder, or 400 to 500 times of 64% alum, or 500 times of 58% methalenemanganese zinc, or 200 to 250 times of 40% ethylphosphine aluminum wettable powder, or 600 times of Pulik aqueous solution, or 600 to 800 times of 18% frost gram suspension. At the beginning of each of the above prescriptions, spray once every 6 to 7 days, and spray 2 to 3 times in a row.

Spray some disinfectants on the ground, Chlorothalonil, chlorothalonil, spinach foliage can be sprayed with some strong stems, control the temperature, be sure to ventilate more diligently, master the composition of the soil, and so on.

The causes of spinach downy mildew are mostly related to low temperature and high humidity conditions. Once downy mildew occurs, the pathogen can also be systematically infected, and the system-infected strains are prone to atrophy. The lesions expand upwards from the lower part of the plant, the diseased leaves wither yellow when drought, rot more when the humidity is high, and the whole leaves of the serious plant turn yellow and die, and some vegetable plants are atrophied.

It is spread by air currents, rainwater, farming, insects, etc. Under the conditions of low temperature and high humidity with a temperature of 10 degrees and a relative humidity of 85%, or if the planting density is too large, the water is stagnant and sown early, and the disease is severe. Choose disease-resistant varieties.

The leaf color is shiny, high disease resistance, and the planting is trouble-free and less worry-free. Clean the field, find diseased leaves or shrunken plants, and pull them out in time. At harvest time, the leaves of the debris are completely removed and taken out of the field to be buried or burned.

Downy mildew is a frequent fungal disease in spinach cultivation, which is seriously affected in arched sheds and open field cultivation of spinach. Especially in the case of unfavorable environmental conditions such as low temperature and rain, even cloudy days, the plant incidence rate is high and the spread speed is fast, which has a serious impact on the yield of spinach. <>

Spinach downy mildew mainly harms the leaves of the plant, seedling stage, adult stage can occur, in the early stage of the disease, showing water-stained green spots, after expanding, it will be limited by the leaf veins to present polygonal or irregular yellow-brown lesions, the back of the lesions becomes yellowish-white, and some leaf lesions will be raised and blistered. As the disease progresses, the lesions will expand, often several of which are connected together to form a significant bulge. When the weather is humid, the leaf back disease grows a white moldy mold layer, and when it is severe, the leaf lesions are patched together, dry up and die.

In early spring, the atrophic body infected by the system is found in the spinach field, which is pulled out in time, burned outside the field, collected from the disease-free land or from the disease-free plant, applied rotting organic fertilizer, increased phosphorus and potassium fertilizer, and the cultivation density is appropriate, and the rainy day is drained in time, and the protected land is strengthened to release wind, so that it can be watered on sunny days, not watered on rainy and cloudy days, and not flooded with water, and the spinach in the protected area should be watered to strengthen the wind and loosen the soil, reduce the field humidity and strengthen field management: when we plant, we should be sparse and appropriate, apply enough rotting organic fertilizer, and improve the disease resistance of plants. Do scientific watering, avoid flood irrigation, accelerate ventilation, and reduce the temperature in the shed.

Clean the field in time, after the diseased leaves appear in the field, or find the shrunken plants, it is necessary to pull them out in time, after harvesting a stubble, all spinach residue plants, leaves and weeds in the field should be removed, remove all hosts, reduce or eliminate the source of bacteria before the onset or in the early stage of the disease, we should spray as soon as possible to achieve the effect of disease control and yield protection, pesticides are best used alternately to prevent drug resistance. To prevent downy mildew, you can spray 600-800 times of 75% chlorothalonil wettable powder. In the early stage of the disease, it is recommended to use 500-800 times of 58% methalene-zinc wettable powder, 1500-2000 times of 50% Anker wettable powder, spray once every 7-10 days, and spray 2-3 times in a row to <>