Spinach downy mildew should be prevented and treated as soon as possible, what are the better preven

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, after the pathogen suitable for the disease infects a plant for the first time, it will then infect other plants with conidia, and these spores can be transmitted with the help of air, water, farm tools, insects and other vectors. Strengthen cultivation management, appropriate thinning planting, use 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 diseases; Conditional 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, so it 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 it 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 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.

2.Strengthen field management, reasonable dense planting, scientific watering, prevent flood irrigation, strengthen wind, 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, the shrunken strains infected by the system were uprooted and burned in time.

4.In the early stage of the disease, 600 times of 25% Ruixinmyces wettable powder, 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% methacryl manganese 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, oxazim, 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 the planting density is too large, the water is accumulated 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 to the field for deep burial or burning.

Spinach downy mildew is a sexually transmitted disease in which the leaves of spinach are infected with a virus. It is caused by low plant vigor or planting density, moisture or early sowing. In severe cases, it will lead to a failure of the harvest.

Spinach downy mildew is a disease of spinach incidence, which is caused by a species called spinach downy mildew. The symptoms of field damage are as follows: the main damage leaves are frontal, the lesions are light yellow, irregularly shaped, different in size, 3-17 mm in diameter, and the edge is not obvious.

Spinach downy mildew mainly harms the leaves, the leaves are damaged, and begin to produce small spots with light yellow irregularities, after expansion, the lesions are connected with each other, when severe, the leaves are yellow, when wet, the diseased leaves rot, and there is a gray-purple mold layer on the back of the diseased leaves, that is, sporangia and sporangia.

Downy mildew of spinach is a fungal disease that occurs frequently in spinach production, the disease mainly harms spinach leaves, the initial leaf surface produces light green dots, and then develops into light yellow lesions, with the development of the disease, it expands into irregular lesions, the leaf back lesions are attached to the white mold layer, the lesions spread from the lower part of the plant upwards, and it is easy to develop the disease when there is dew at night, when the drought occurs, the diseased leaves wither yellow, when it is humid, the diseased leaves rot, when the disease is serious, the leaves all turn yellow and die, in addition, spinach downy mildew is serious in the low temperature and high humidity environment, It even led to the failure of the spinach harvest.

Mode of transmission. The pathogen overwinters on the host, the seed or in the leaves of the diseased residue, under the low temperature and high humidity conditions of 10 degrees Celsius and the relative humidity of 85%, it is suitable for the development of the pathogen, and the conidia are infected in the field by air flow, rain, farm tools and insects, and the pathogen invades from the stomata or wound on the leaf surface of the plant, and the disease is more serious under the condition of over-dense planting, weak plant growth, water accumulation and early sowing.

Spinach downy mildew mainly affects the leaves, which are small spots with pale yellow and inconspicuous edges at first, and then become irregular as they expand. The underside of the leaves produces a gray mold layer that gradually turns lavender. In severe cases, the whole leaf turns yellow.