Black spot disease mainly harms leaves, how to prevent black spot when planting snow peas?

The main control measures are: one of them is the cultivation of sterile seeds. Second, promote the cultivation of high furrows.

Proper dense planting, increase potassium fertilizer, improve disease resistance. Third, pharmaceutical prevention and control. Among the agents for the prevention and treatment of fungal diseases, there is a "hero of the fight against black":

Difenoconazole. The Yangtze River basin can have three seasons according to the arrangement, one is to sow in the open field from mid-October to early November for wintering, and harvest in May every year.

Second, it is sown in early spring in March and harvested in early to mid-June. The third is to sow in late August and harvest from November to March every year. Snow peas are long-day plants that prefer coldness.

Most varieties bloom earlier when exposed to extended light and delayed when exposed to shorter light, but some early varieties do not have strict light requirements. Generally, varieties require strong light and longer periods of sunshine during the pod-setting periodWater well. Snow peas are not drought resistant or waterlogged, so watering is not equal to watering, generally grasp the drought for three days a watering, it is best to fill the water with water, if there is a rainy day, to drain the waterlogging, otherwise it is easy to rot roots, affecting the normal growth of snow peas and even death.

Snow pea is a semi-cold-tolerant crop, and the cool, humid and single-day hot climate conditions are conducive to its growth and development, and it has strong adaptability to soil conditions. Snow peas in different growth periods, have different requirements for temperature, the specific snow peas when to plant appropriate, but also depends on the south or north, different regions, planting time is different. In fact, if snow peas are grown in the south, they can be grown all year round.

Spring planting is available in the month.

Spring cultivation: sowing in the middle and lower reaches of the Yangtze River from late February to early March, harvesting before high temperature; Spring sowing and summer harvest in Northeast China, generally sown in April and May, according to the need, cover with small sheds, mulch film, etc. can also be sown early. The spring cultivation growth period is short, the early low temperature, the spring stubble, that is, the beginning of February, planting, planting in mid-March, to May and June can be harvested; This method is the most commonly used cultivation method in our hometown, which is particularly simple and easy to use, but a large amount of cultivation requires soil preparation, fertilization, drainage and trenching.

Snow pea black spot disease mainly damages leaves, stems and pods, affects crop growth, and needs to be strengthened. It is recommended to choose disease-resistant varieties for timely sowing and reasonable fertilization to improve plant resistance. In the early stage of the disease, use copper noble suspension or chlorothalonil wettable powder for spray control.

The first is to carry out reasonable dense planting, and the second is to select excellent varieties with disease resistance for planting.

Pesticides. Because my family has planted dozens of acres of snow peas, after spraying pesticides, snow peas will not get black spot disease, so I use pesticides to prevent and control.

The first reason why snow peas get black root disease is that the soil moisture is too low, and the emergence of snow peas is very slow, and it is also eroded by pathogens, and it is also because of the presence of a large number of spores in the soil, so it causes snow peas to get this disease.

It may be because of soil problems, it may be that the temperature is not well controlled, there is a lack of moisture, there is no pest control, there is not enough sunlight, etc., these can lead to snow pea black root disease.

It is very likely that there are a lot of bacteria in the roots of snow peas that cause rot, and it will also spread a large area, and it is not well managed in the early stage, so it will cause a lot of losses.

There are some pests and diseases, and there is no regular watering, and the land is also very arid, not moist at all, etc., so it will cause black root disease.

It may be because of the variety, or it may be due to the lack of nutrients in the soil during the planting period, the invasion of pests and diseases, or it may be due to the lack of water and fertilizer management during the planting period.

Snow peas are a kind of vegetable that many friends like to eat, and many people will like their nephews in the usual process, and when planting and difficulty, they will find that the black root has a high mortality rate, so in this case it will also have a very serious impact, so in the face of such a situation, how should we judge the symptoms? <>

If this happens, mainly in terms of economy and taproot, the disease will appear at the beginning of the water, then it will become softer, and there will also be slight discoloration, and over time it will eventually turn black-brown, then in this case it is easy to cause a wide range of snow peas to die.

If snow peas have such a situation, the impact on the overall yield is very large, and because of this, there are many people who are very concerned about this situation, the main reason is caused by pathogens, because the bacteria can easily cause plant diseases after contact with the roots and soil of the plant, then in this case it will have a very serious negative impact, and it will also cause very large losses to farmers. <>

It is precisely because of this that we need to pay special attention to eating snow peas at noon, and in the process of planting, we must do a good job of virus protection during pregnancy, only in this way can we reduce the possibility of infection and make snow peas grow healthy and strong.

In addition, when planting snow peas, we must pay attention to the fact that the same land cannot be planted all the time, but needs to be rotated after planting for a year or two, so as to reduce the occurrence of diseases and improve their own yield. <>

With the above understanding, you can know how to face such a situation after the official snow pea, and you can better solve the problem, and if you don't have a special understanding of this, then it is easy to lead to the loss of your own interests.

Snow pea black root disease mainly affects the base of the stem. The stem base and taproot are infected, the diseased part is water-stained at the beginning, gradually softens, slightly discolored at first, and then black-brown, the roots near the diseased tissue are reduced, and the root hairs are easy to fall off, resulting in a large number of plants dying.

There are a lot of stains on it, and it slowly softens at first, with some slight discoloration at first, but later on, the black-brown root hairs will all fall off, causing the roots to die.

The roots will rot in a large area, and the roots will eventually turn black-brown, the branches and leaves will fall off in large quantities, and the plants will die in large quantities, which will seriously affect the yield.

When we talk about low temperature barriers, this physiological disease in the growth process of eggplant, if it encounters a slight low temperature, there will be a decrease in chlorophyll, yellow spots will be produced near the petioles, the diseased plant will grow slowly, the plant will stop growing, and the phenomenon of chilling injury will occur when there is a lower temperature above freezing. Water-soaked patches appear on the tips and margins of the leaves, and the leaf vine tissues turn brown or dark brown, and then gradually appear wilted, and finally cause the phenomenon of flower drop, leaf drop and fruit drop.

<>, the reason for the crazy growth of eggplant cultivation is very simple, generally speaking, the main reason is that the planting density is too large, and the growers prefer to apply nitrogen fertilizer. During the squatting period, the seedlings were watered and fertilized prematurely, and the light was weak and insufficient. These reasons will cause the eggplant to grow densely, the branches and leaves are too vigorous, the flowers are less, and the fruit drops more.

Most of the diseases that cause harm on eggplants are parasitic. Such as wilt cataplexy, cotton plague, brown striae verticillium wilt, etc. At the same time, there are also various physiological diseases.

Such as stiff seedlings and leaf rolling, burning leaves and yellow leaves, falling flowers and falling fruits, cracking fruits, sunburn umbilical rot, hollow fruits, poor coloring and other problems. The first is to choose low-temperature tolerant or early-maturing eggplant varieties. Ensure good moisture in the soil seedbed.

In case of low temperature or long-term rain, it is best to use the form of small arch shed buckle film to raise seedlings, timely wind and dampness, and do not water on cloudy days.

The main harmful symptoms are: the diseased part of the eggplant fruit is hard and sunken and turns black into spots, and sometimes black mold appears in the diseased part. Or the skin of the eggplant fruit turns brown and rotten, and emits a foul smell, and some of the diseased fruits fall off.

After the diseased fruit does not fall off, it is dried up and shrunk after losing water, and then hangs on the eggplant to form a dry and stiff fruit. In addition, in the early stage of eggplant disease, eggplant plants can be treated with stems and leaves with 27% copper noble suspension 60o times, io% oxetherazole 2000 times, 3% oxygenated water agent 800 times, and 47% Chunwang copper plus Ruinon wettable powder 700 times, and the control effect is relatively good.

With the aggravation of the disease and the prolongation of time, the small spots will fuse into large lesions, and the leaves will turn yellow and fall off, or rupture and perforation, which will affect the photosynthesis of leaves.

Peas encounter low temperature obstacles in production, especially after frost damage, sudden onset, rapid expansion. Pea plants are susceptible to disease if they grow long, do not drain timely after rain, and apply too much fertilizer. Peas are susceptible to disease when cultivated out of season.

Avoid planting peas in low wetlands, use high furrows or ridge cultivation, pay attention to ventilation and light, and drain water in time after rain.

Organic fertilizer must be fully decomposed, and the selection of good varieties of seeds for planting, can be a good solution to this problem. It can also be autoclaved. Quicklime can also be used for control.

Spray pesticides. Because my family grows dozens of acres of snow peas, I use pesticide spraying for control.

A disease-resistant variety. Select disease-free seeds, or pre-soak the seeds in cold water for 4-5 hours, soak them in 50 warm water for 5 minutes, and then move them into cold water to cool and dry for sowing. Choose high-dryness plots, reasonable dense planting, and adopt formula fertilization technology to improve disease resistance.

After harvesting, the fields should be cleaned in time and deep ploughing should be carried out to reduce the source of overwintering bacteria.

At the initial stage of the disease, spray 1500 times of 50% benmonyl wettable powder or 800 times of 40% polysulfur suspension, 500 times of 70% thiophanate-methyl wettable powder, 500-800 times of 30% Luyedan wettable powder, and 600 times of 80% spray wettable powder, and control once every 7-10 days, and 2-3 times in a row.