Asparagus is prone to stem blight during high temperature and rainy seasons. How should we use medicine to prevent and control it?

Asparagus, when it comes to this, many friends probably first think that asparagus is the bud of a reed? Like bamboo shoots, asparagus grows into reeds? In fact, reed and asparagus. Asparagus is grown in northern and southern China. It can be said that asparagus is not very harsh on the growing environment. It is almost a heat and cold tolerant plant and is generally well adapted to the environment. If grown in the north, the taste will be higher than asparagus grown in the south.

Well, I've been selling pipes for a long time. Today, let’s talk about asparagus. Asparagus is a vegetable that needs to be grown separately, not the buds of reeds. Asparagus is the sprout of asparagus, but don't look at the little sprout. Asparagus can be said to be the "king" of vegetables compared to other vegetables. Mainly because asparagus contains a large amount of selenium and other nutrients that are beneficial to the human body, asparagus is said to be the "king of vegetables" in vegetable fields.

Asparagus has been cultivated in many areas of China for hundreds of years. Asparagus is an exotic species. According to records, it was first discovered in the Mediterranean and was later introduced to China in the Qing Dynasty. During the Qing Dynasty, asparagus was also introduced into high-end restaurants as a high-end vegetable, but it was not available in ordinary small restaurants. It is also said to be the favorite vegetable of the Qing Dynasty royal family. Asparagus is delicious, but it’s a bit difficult to grow, and most importantly, it’s prone to infection.

Asparagus stem blight is a common disease in asparagus planting areas. It is known as "vegetable terminal disease" in nature. Almost when asparagus is infected with stem blight, it also causes the death of asparagus plants. , because its incidence and mortality rates are high, therefore, for asparagus stem blight, we should focus on prevention in the early stage, so as to ensure the production in the later stage.

Asparagus stem blight mainly harms bamboo shoots, followed by branches and leaves. However, in the early stages of the disease, it basically corrodes bamboo shoots, and the chance of infection of branches and leaves is very small. In the early stages of the disease, the pathogen invades the roots of the plant and causes root damage. After parasitizing on the roots, the fungus begins to get sick. Yellow-brown spots appear in the early stage, and then slowly become sick at the roots. The pattern of asparagus stem blight is the damage caused by the pathogen attacking the plant. The causative agent of asparagus stem blight is conidia of Phomophomonas. After the pathogen passes through the appropriate temperature, spores will separate out, and then the spores will quickly invade the plant, causing the plant to become infected.

Causes of asparagus stem blight

(1) The incidence is related to the pathogen

The pathogen of asparagus stem blight can survive in nature as a host. It can be said that pathogenic bacteria are everywhere and pathogens can survive in the air. Soil, water, weeds and other plants are habitats for pathogenic bacteria, which can produce microspores on the host indefinitely. Moreover, the pathogen is very tenacious and can hibernate in the soil over the winter. Disease occurs when temperature and rainfall are involved.

(2) The incidence rate is related to seed selection

As far as the incidence rate of asparagus is concerned, seedling selection is the biggest key. Some non-disease-resistant varieties tend to mix into the planting field, so extensive management can bring disaster. If there are seedlings that are susceptible to the disease among the varieties planted, then almost the park will be declared dead at this time, because asparagus stem blight is very contagious and relatively strong.

(3) The incidence rate is related to the planting area

Asparagus can be grown all over the country, and the temperature is suitable for asparagus. It can be seen that asparagus is also an unaccustomed vegetable, but for the planting areas, the temperatures in East and North China are relatively distinct throughout the year, and it is not easy to be infected by stem blight, but for South and Central China. The pathogen of asparagus stem blight usually spreads widely at temperatures of 22-28°C. At this time, pathogens are also eager to attack the asparagus. Once wind, agriculture, and rain are used, the germs will start to act, especially when there is a lot of rain, which is the fastest time for germs to attack asparagus.

(4) The incidence rate is related to fertilizer and water

Asparagus cannot be planted without boiling water, but in hot and rainy weather, the incidence rate is high. Due to the imperfect drainage mechanism of the seeder, the accumulated water cannot be drained out in time, making it easy to get sick. Secondly, when watering, growers do not pay attention to the amount of water, resulting in excessive moisture in the field.

When the humidity is too high, it will create soil for pathogens to breed, so there will be more and more conidiospores. The amount and proportion of fertilizers will also lead to the occurrence of diseases. Because the fertilizer is too heavy and the fertilizer is not applied, it will cause diseases.

(5) The disease is related to field management

When asparagus was planted in the early stage, it was not planted according to the appropriate plant spacing, resulting in poor plant light transmittance, careless field management, overgrown weeds, and dead plants. The plants are not cleaned in time, and the ventilation effect in the field is poor. Especially after rain, germs appear, opening the door for germs.

Methods for the prevention and control of asparagus stem blight

(1) Seed selection and control

When planting asparagus in the early stage, some disease-resistant varieties should be selected in the early stage of planting. There are also options for some asparagus varieties. Depending on the temperature and climate of your growing area, you can choose some asparagus seedlings suitable for local planting. After selecting seedlings, you can soak them with carbendazim or potassium permanganate, then dry them before planting. Seedling selection is also holistic.

(2) Management and prevention of planting land

In the early stage of planting, some new land should be selected for planting. The probability of residual pathogens in newly reclaimed soil is relatively small. Experiments have shown that in some continuous cropping areas, the incidence of disease is relatively high, especially in planting areas where disease occurred in the previous crop, and parasitic pathogens will remain in the soil in winter. Once the temperature is high and there is a lot of rain after planting, pathogens will appear. As with the previous crop of peppers, neither were the eggplant fields. When planting in continuous cropping fields, disinfection must be carried out. Quicklime, household ash, and formalin can be used for disinfection.

(3) Fertilizer and water management and prevention

Asparagus planting is inseparable from water and fertilizer. Most vegetables, fruit trees, and other plants like to be fertilized. In the early stages of planting, fully decomposed organic fertilizer should be used. In the later stage, pay attention to the fertilization ratio, pay attention to the application of nitrogen and potassium fertilizers, and do not apply one kind of fertilizer. Control the amount of nitrogen fertilizer used. When topdressing, try to use full-price chemical fertilizers. Usually water once after planting and then water again according to drought conditions.

(4) On-site management and control

When the temperature is high and rainy, try to maintain the temperature of the planting area to avoid pathogenic bacteria causing damage to the plants when the temperature is too high. When rainfall increases, attention should be paid to improving drainage and irrigation facilities in a timely manner. Do not allow too much water to accumulate in the planting area and drain the rainwater in a timely manner. For asparagus planting areas, clean up the garden in a timely manner after harvesting, remove weeds and residual branches in the field, and use them exclusively. Pruning is also important for proper planting. Asparagus needs to be trimmed and topped at any time, which will cause water loss and compete for nutrients. It is necessary to prevent asparagus plants from being destroyed by pathogens after they grow too long, and to choose the harvest time in time to avoid harvesting during periods of high disease incidence.

(5) Agricultural control

For asparagus stem blight, due to its rapid onset and high mortality rate, prevention should be carried out in advance during treatment. Especially during daily inspections, diseased plants should be discovered in time and treated to prevent other healthy asparagus from being infected later. The main inspection time is from August to September, when it rains for the first time. If a disease is discovered at this time, it can be treated with drug spraying.

To sum up, asparagus has many diseases, but for this highly nutritious vegetable, prevention is the most critical. Usually, efforts must be made in variety selection, field management, water and fertilizer application, etc. The later management of asparagus will get twice the result with half the effort, and it is also a good strategy to increase the benefits of growers.