Celery has bacterial leaf spot, what harm does this cause to celery?

Celery leaf spot begins to occur at the celery seedling stage, and the growing plants are severely damaged. Mainly harms leaves. First, starting from the leaf margin, the leaf spots become pale green and overflowing.

The spots start small and gradually enlarge in the later stages. The spots are light brown in the middle and raised in the middle, with a yellow halo around them, and the spots can extend to the whole leaf. Eventually the entire leaf dies and the spots become translucent.

Damage to the stem, at the beginning there is a small class of water immersion round, and the lesions at the back are depressed. The condition was severe, the celery fell to the ground, and the white mold layered. The pathogen is caused by Cercospora subphylum Cercospora and overwinters mainly by invading the seed coat, hyphae and spores in the remnant plant and soil with hyphae attached to the seed surface.

In the second year, under suitable temperature and humidity conditions, new conidia are produced, which are spread to plants through rain, farming tools or tillage operations, and invade directly from the stomata or epidermis to cause diseases. The disease belongs to the high temperature and high humidity type, which is relatively common and prone to outbreaks.

Before planting celery, the soil should be dug deep and dried in the sun to effectively kill germs and underground pests in the soil. For formal planting, 40-50 kg of quicklime is used per acre, mixed well with soil and fertilizer, and then sprayed and sterilized. First of all, it is necessary to plant reasonably and densely, and it is recommended to use wide ridge planting method to facilitate drainage and irrigation.

During the planting process, it must be watered reasonably, and flood irrigation is strictly prohibited. Once a disease occurs, watering should be reduced or suspended to prevent excessive humidity in the field. After the outbreak of the disease, we should try our best to control the amount of watering.

The pathogenic bacteria overwinter with hyphae attached to the surface of the seeds to invade the seed coat, residual diseased plants, and hyphae and spores in the soil.

Under suitable environmental conditions, the hyphae produce conidia, which are transmitted to the host plant by air currents, and in the presence of water droplets, invade directly from the host epidermis, causing primary infection. Sowing diseased seeds, after the emergence of seedlings, will be infected with the disease, in the disease site will produce a new generation of conidia, through wind and rain, multiple re-infection, continue until the end of autumn, the damage will gradually increase. The pathogenic bacteria prefer high temperature and high humidity environment, the optimal temperature for the onset of disease is 22 30, the relative humidity is 85% 95%, the optimal temperature for conidia formation is 15 25, and the optimal temperature for germination is 28.

The ideal temperature range for conidia germination is 15 20 °C, which requires less humidity and is more conducive to the onset of disease. Low-lying areas are prone to disease, but they are also prone to disease in conditions of high temperatures, droughts, and nighttime dew. In addition, insufficient fertilizers, poor drainage, over-irrigation, or weak plants are also severe.

It will cause a decrease in the yield of celery, and there will also be some problems with spot diseases, which are very bad behaviors and should be stopped.

Celery bacterial leaf spot is an important disease of celery, both in protected and open fields, with an incidence of 80% in severe cases, affecting the yield and quality of celery, mainly harming leaves, and the pathogen of celery bacterial leaf spot disease can overwinter on weeds and other crops, becoming the source of primary infection, and the growth temperature is suitable for 30, 41 and does not grow.

It is mainly harmful to leaves, and old leaves are more susceptible to disease than new leaves. Leaf damage, first at the leaf edge, petiole disease, gradually spread to the whole leaf, the leaf damage in the early stage of yellow-green water-soaked spots, later development into round or irregular shape.

There are four causes of celery root rot: celery wilt disease: after the seedlings are susceptible, they grow slowly, and wilt or die in severe cases.

Adult susceptible disease; Celery root rot: mainly damages the root and stem base, the plant wilts and dies, and is easy to pull out; Celery gray mold: the disease is mostly from the rhizome at the seedling stage, and the whole celery plant rots; Celery black rot:

It mainly damages the rhizome and the base of the petiole, and the later rupture exposes the subcutaneous infected tissue.

It is because of the lack of water in the soil that such a blight will occur, and a large amount of water should be carried out at this time, so as to avoid such a situation and prevent it in time.

The main reason is that there is too much water, but there is not enough sunlight, so this situation will occur, which will directly affect the yield, and there will be a lot of wilting.

For the celery after transplanting and planting, sufficient water and fertilizer can promote the growth and strength of celery seedlings. Small seedlings are watered with small water, large seedlings are rain-proof, and drainage is smooth, so as to avoid water accumulation in the field, so that excessive humidity in the field mainly causes harm on celery leaves. The disease begins at the tip of the leaf and extends to the inside of the leaf and in the direction of the petiole.

At the initial onset, only small spots of fading green water stains appeared, and with the aggravation of the disease, round or irregularly shaped lesions were formed, and the diseased part dried up and became grayish-white. In a humid environment, the disease has small black particles and large spots, and in the case of high temperature and humidity in summer, increase ventilation and reduce the ambient temperature and humidity.

Cercospora apiflora likes a high temperature and high humidity environment, the suitable temperature for mycelial development is 25-30, and its conidia can be formed when the appropriate temperature is 15-20 and the relative humidity of the air is close to saturation for 10 hours. The temperature is 28, which is the most suitable for the meristem of Cercospora celery, with a yellow halo on the periphery. The lesions are not limited by the leaf veins, and in severe cases, they will expand and form plaques, eventually causing the entire leaf to turn yellow and die.

The petioles and stems are infected, the lesions are oval, 3-23 mm in size, and initially produce water-stained small spots, which enlarge into dark brown slightly depressed stripes.

It can be cultivated in both the north and south of our country. There are many varieties and high value, and it is a popular dish on the people's table, especially celery fried meat, which can never be eaten. Therefore, we can always do without celery in our vegetable garden, and at the same time, celery is also a planted, harvested vegetables for many times, with large market demand and high yield, you can harvest celery in winter, and after celery is planted, the suitable growth temperature is 15 20 degrees.

Although celery is cold tolerant, there will also be diseases in heavy crop planting and management, such as celery leaf spot, which will affect the growth and sales of celery.

In fact, celery leaf spot is also called celery early blight and celery spot disease. This disease is more common in the growth and development of celery. It often causes damage to the leaves and stems of celery plants, causing celery leaves to turn yellow and dry up prematurely, wilt and die.

Absolutely. As long as it is not properly maintained, as long as it lacks nutrients, and the soil is particularly compact, it will get leaf spot.

Yes, celery can also get leaf spot, but the chance of developing the disease is relatively small, as long as the soil moisture is maintained and planted correctly, it is not easy to get the disease.

Celery can also get leaf spot, so you need to pay special attention when planting celery, and spray it in time when you find it, so as not to cause damage to celery.

Diseases of vegetables such as celery are generally divided into 4 types: 1 fungal diseases, 2 bacterial diseases, 3 viral diseases, and 4 physiological diseases

1.Fungal ones are (1) Botrytis cineris (2).Downy mildew blight (3).Leaf spot (powdery mildew, anthracnose, rust, leaf mold, black star) (4) wilt

2.Bacterial angular spots, ulcers, R. solanacear, leaf blight, ginger blast, soft rot 3Physiological pesticides, fertilizers, frost damages, sunburn damage, and gas damage

Celery, also known as celery, wormwood, salsa, salsa, medicinal wormwood, and wild coriander, is a bi-annual apipo. Aibao is an important vegetable in China. Clear away heat and liver, refine and detoxify, strengthen the stomach and invigorate blood, have good edible effects, and are convenient to manage, and now many farmers have planted them.

The base of the diseased plant and the base of the petiole first turn yellow and brown near the soil, and then the diseased part gradually softens, darkens and decays. The decomposed part also emits a pungent odor that eventually causes all the celery to die. In addition, the disease often occurs in the presence of continuous rainfall and rainfall or very wet soil.

Soft rot mainly affects the petiole or the base of the stem. Environments with a lot of rain can easily cause diseases. In the early stage of the disease, there are more water stains in the lesion site, and later it becomes irregular light brown patches, and only the epidermis is left to decay.

Control methods: selection of disease-resistant varieties, rotation with potatoes, corn and other crops for more than three years.

Many vegetable producers do not pay attention to early disease prevention and control. When they find that the field is not properly managed, it often leads to infection, disease or dead trees in large areas of healthy vegetables, resulting in severe yield drops and losses. The massive decay of the pulp is caused by a pathogen called carot erwinia, which can infect at temperatures of 2-40 degrees Celsius and multiply in environments with humidity of more than 20%, but is best suited for growth, multiplication, infection and spread in environments with a soil pH of 25-35 grams and humidity of more than 90%.

Avoid harmful roots, do not cultivate soil too high, pay attention to drainage in the rainy season, water less or stop watering in the early stage, and remove infected plants in time once found. The disease point should be formally disinfected with 1:20 times or replaced with guest soil, or sprinkled with some lime to disinfect the soil, mix and sow with the soluble powder in Nongkang 751 powder or Fengling powder according to 1% of the seed weight, or use 15ml of 100 times of 2% Nongkang 751 water solution, mix 200g, sow after Secas, and in the sowing furrow, 5kg of 2% Nongkang 751 water agent or 1kg of soluble wind chime powder, add 50kg of water and evenly spread it on the slope top and slope of the ground.

Be sure to put the celery in plastic wrap while removing it all from the rotten area, and then place it in a cool place away from the sun.

In such a situation, it is recommended to use some anti-bacterial and insecticidal agents as much as possible, and then mix them in water for watering, and secondly, you should also buy some special anti-insect drugs, so that it will be better.

It is necessary to water in time, to ventilate in time, to pay attention to the density of planting, to fertilize in time, and to control the temperature.

It is necessary to carry out the prevention and control work in advance, we must choose the right varieties for planting, we must pay attention to the clearing of the land, pay attention to the protection of the land, and we need to fertilize and water on time.

Petiole cracking is usually caused by boron deficiency in the soil or stunted plant growth under low temperature and drought conditions. In addition, when the plant absorbs too much water, if it suddenly encounters high temperature and high humidity, it will cause the tissue to fill with water quickly, which will also cause the petiole to crack. To prevent excessive nitrogen application, when the nitrogen concentration exceeds 400 mg kg, the growth is obviously not good, the leaves become longer, the length of the leaf internodes becomes shorter, the petiole is wide, easy to lodging, the centristion period is delayed, and the harvest period is late.

After colonization, use 25% methamethacarb 600 times, 72% streptomycin 3000 times or 70% oxamycin 3000 times, 50% Fumeishuang 1500 times, 1000 times of Xinnong Xlefeng or 3000 times of methroxinitrile.

<> if pests and diseases occur in the process of celery growth, we need to spray pesticides, but we must spray according to the density of celery planting, and pesticides must be used scientifically to avoid pesticide residues. It can also be combined with watering after celery seedlings, using kilograms of boron fertilizer per mu. Celery is particularly sensitive to boron in growth, and the cracking rod is mainly caused by boron deficiency, and borax can be increased by 1-2 kg per mu in the bottom fertilizer, and the borax solution sprayed 2-3 times on the foliar surface during the growth period can also be quickly controlled.

Pay attention to the weather when spraying, avoid high temperatures and rainy seasons, and try to choose the morning or evening.

In the seedling period, generally with small water frequent watering principle, keep the soil moist, wait to grow to 1 2 true leaf time seedlings, before and after the seedlings are lightly watered a little water. Generally, depending on the weather and soil moisture, watering is determined. Pay attention to watering should be watered with small water frequently, soft rot is easy to occur in a humid environment, the disease has a smell, careful observation is also relatively easy to distinguish, can be sprayed 27% copper noble suspension 600 times liquid, 77% can kill wettable particle powder 500 times liquid or 47% Garinon 600 times liquid for prevention and control.

For the prevention and control of celery virus disease, crop rotation can be adopted, which can reduce the occurrence of the disease. Adequate fertilizer is applied before planting, and then field management is intensified.

If there is high temperature and drought in summer, a shed should be built to shade the sun, and if the diseased plant is found when the celery grows, it should be pulled out in time, and if aphids are found, it should be prevented and controlled in time to avoid the spread of the virus.

Before the onset of celery virus disease, Ningnanmycin can be used; Riboside triazole, or formiguanidine. Copper acetate can be sprayed once every 5 to 7 days depending on the severity of the condition. Celery disease control methods.

If there is a hollow situation, in addition to applying enough base fertilizer, it is necessary to top dressing in time during the growth process to avoid planting in the sandy field; If heartburn occurs, it is necessary to avoid high temperature and drought, and to manage the temperature and humidity appropriately, the available calcium fluoride solution is sprayed on the foliage.

At this time, you must spray pesticides on celery, and you must prune these injured parts of celery, and then you must water more and fertilize more.

I think you should spray some pesticides to prevent the symptoms of pests and diseases in celery, and you should do weeding or pruning, which I think is very reasonable.