Cauliflower blight occurs in a wide range, what are the symptoms of cauliflower blight?

Cauliflower, also known as cauliflower, is a kind of vegetable that people like to eat, and there are many ways to make cauliflower, which taste is 10 points delicious, so it is popular with the public. And cauliflower can also have a certain effect on people with poor appetite and indigestion. However, in the process of cauliflower planting, cauliflower blight will occur, and the disease occurs in a wide range, which has a certain impact on the quality and yield of cauliflower.

Once infected, cauliflower blight, the plant will break off and rot. <>

Symptoms of cauliflower blight.

There are several types of blight, and if the seeds are infected before germination, the seeds will rot underground and eventually die. If a seedling is infected with standing blight shortly after it emerges, the bacteria will invade from its rhizome and infect the plant and cause its tissues to rot, resulting in lodging of the seedling. If the seedlings are unearthed soon after they are unearthed, and the external environment is humid, white silk will appear on the stems and leaves of the seedlings, causing the plants to wilt and the stems and leaves to rot.

The pathogenesis of cauliflower blight.

Blight bacteria live in the soil in the form of hyphae or live on plant residues for the spring. And this pathogen can survive in the soil for 2 to 3 years, its pathogen can be spread through rain or agricultural tools with bacterial soil, if the root of the plant seedling has a wound, the pathogen will enter the infected plant, generally in a high temperature or rainy and humid environment, the probability of infection is higher, if the resistance of the plant is weak, it will also be easy to get sick. <>

Prevention and control methods of cauliflower blight.

First of all, it is best to choose disease-resistant seeds before sowing and can be mixed with pesticides, which can have a better control effect. Crop rotation is a great way to control pests and diseases, and it is best to rotate crops with grasses. When sowing, it is best to choose a place where the land is flat for sowing, and it is best to start sowing when the low temperature is stable at 12 15.

In addition, it is necessary to strengthen field management, and during the planting period, it is necessary to screen out diseased seedlings in time and treat them in time to prevent infection with other seedlings.

First of all, after the seedling is lignified, the stem appears white hairy, filamentous or white spider web, and then the root cortex and fine root tissue rot, the stem and leaves are yellow, and finally cry dryly, and then die.

At the seedling stage, there will be white hairs or filaments, and the cauliflower will dry up and die, but it will not lodging, which is a symptom of cauliflower blight.

The leaves will turn yellow or wilt, mainly because they are not very good at this, so in general, it is also because there is no timely irrigation of the soil, resulting in a lack of water.

The symptom is that there are a lot of small insects on it, and there will be mildew on the surface, accompanied by yellowing of the leaves, and the withered area is relatively large, and it is also very difficult to ** at this time.

When the seedlings are infected by the virus, they will wilt during the day and recover at night. But if you look closely at the slag and you will find that there is a dark brown and water-stained lesion at the base of the stem, as the lesion expands, when it surrounds the base of the stem for a week, the lesion will gradually sink and overflow, if diluted, 1 part of the agent can be mixed with 1-4 parts of water, in principle, the less water, the better. In areas where the disease is severe, it is advisable to use high doses within the recommended range.

It has systemic and contact killing effects. Treated seeds should not be used as food or feed. Do not graze livestock in the application area for 6 weeks after sowing.

If it is cultivated in the high temperature season, it is prone to diseases and insects, or the quality is inferior and the yield is low, so it is not suitable for summer cultivation. It is very resistant to low temperatures. Cabbage is suitable for cultivation in loam soils rich in organic matter, not in poorly drained clay soils and leaky sandy soils.

Stem base rot or root rot may occur. Prevention and control: In the early stage of the disease, it can be used to spray root irrigation with vicious spirit, allicin, ningnanmycin, polymycin copper humate, Pythium, prochloraz, etc., with an interval of 5-7 days, 2-3 times in a row due to the production process of pesticide enterprises, content, and recessive ingredients are similar to cataplexy in the early stage, and it is not easy to distinguish, but the disease plant is not cataplexed in the later stage, and the disease is slow or not obvious light brown arachnoid mold, and the course of the disease is slow, which is different from cataplexy (cotyledons are not withered but the seedlings suddenly fall suddenly, causing the seedlings to lie on the ground, When the humidity is high, white cotton floc-like hyphae grow around the diseased plant).

At the beginning of the disease, 800 times of 90% ethylphosphine aluminum plus 1000 times of potassium permanganate, or 600-800 times of 72% Kelu wettable powder, or 600 times of 58% manganese zinc wettable powder, or 600 times of Pulik water solution, or 600 times of 40% copper oxychloride suspension, spray 2-3 times alternately because the night is cloudy and the morning is humid. In severe cases, the lesion may extend to the entire base of the stem and circle the stem. It causes the root shrinkage of the shoots, stems and leaves, and the roots decay with it, and the seedlings are divided into erect wilt and atrophic sj.

The surface of the affected part of the air is humid and produces brown sclerotia sclerotia.

Carbendazim wettable powder for cauliflower blight has a good effect and can effectively control pests and diseases.

It is better to use pesticides for cauliflower blight, he can quickly kill the bacteria, it is best to use the pesticides of the big brand of lead people, so that the seeds will stimulate the branches to have a better bacteriostatic effect. Only the cons.

After the seedlings are removed, the acupoint is applied with bran ash, or the following agents are sprayed: 75% chlorothalonil 1000 times solution; 65% zebsen 800 times solution; 70% Dixon 800-1000 times liquid. Vegetable seedling blight is more common in the middle and late stages of the seedling, and the base of the stem of the affected vegetable seedlings in the early stage of the disease will have dark brown lesions, and the diseased part of the plant shrinks and dries up gradually, and the symptoms of death appear.

When the humidity of the greenhouse is high, the diseased part of the plant will appear brown and sparse spider web mold, which is <>

At the beginning of the onset of the seedling, the base of the stem begins to appear oval or unshaped dark brown lesions, some seedlings wilt in the leaf stem during the day, and return to normal at night and morning, with the aggravation of the disease, the lesions will go around the young stem for 1 week, and gradually sink and stop drying and shrinking, the young plant dies, but the dead plant is not easy to fold the damaged seed rot in the soil, it is oval or irregular dark brown lesion at first, and then gradually expands, around the stem for a week, the diseased part dries up and expands to the root and withers and dies, but does not lodging. When the root cortex is shed and the soil is moist, the diseased part produces light brown sparse filamentous mycelium.

Blight does not produce asexual spores, only mycelium and sclerotia. Sclerotia amorphous, nearly spherical, black-brown, millimeters in diameter. The sexual stage is the melon dead fungus.

The host range of S. solidis is wideIncluding vegetables, crops, forestry plants, pastures, flowers, etcChoose the best seedling or fire kang seedling to shorten the seedling time. The seedbed should also increase the light as much as possible, and pay attention to the ventilation and humidity reduction of the seedbed, especially in continuous cloudy days and insufficient light, it is necessary to seize the opportunity to ventilate and reduce humidity; The seedbed should divide the seedlings early, so that the seedlings are strong and improve the disease resistance.

Mainly damage the base of the seedling stem or underground roots, at the beginning of oval or irregular dark brown lesions, the seedlings wilt during the day in the early stage, recover at night, the diseased part gradually dents, overflow, some gradually turn black-brown, when the lesions expand around the stem for a week, dry and die, but do not lodging. We use Tianlu Sterilization King to prevent soil-borne diseases, and the effect of eubacteria is very good, as long as it is prevented regularly, it will not get sick. If your seedbed has a blight, please use Tianlu Sterilization King Spray Root to control the spread of blight, and then beat it again in 3-5 days to consolidate **.

The first is to choose a cauliflower variety with high disease resistance to plant, plant it in a greenhouse, and then when it blooms. Spray pesticides on the rhizomes and leaves of the flowers, so that you can prevent the disease.

Pesticides should be sprayed in a timely manner, and water management should be strengthened, and pests should be removed in a timely manner, and sufficient sunlight should be ensured, and professional planting techniques should be learned, and soil permeability should also be maintained.

When planting, we must choose the soil is more fertile and wide land, and in the process of fertilization, we must choose farmhouse fertilizer, do not use fertilizer bought outside, and often prevent the occurrence of pests and diseases, water the plants more, if there are small insects, then we must spray insecticides in time.

For spring cultivation, it is advisable to choose varieties that are not sensitive to low temperature in the early stage of growth. Such as Green Ridge, Green Emperor, Green Green, Early Green, Bisong, Bishan, Green Flower No. 2, Zhengyanshui, Shanghai No. 1, etc. (2) Cabbage seed coating hanging film.

Add oxytetracycline to the characteristics of China's agricultural development in the Song Dynasty or 3% of 75% chlorothalonil into the film-forming solution, stir evenly and mix according to the ratio of 30 parts of seeds and 1 part of liquid medicine, and use it after drying.

Fusarium wilt can occur in the whole growth period of cucumber, and the symptoms of cucumber leaf blight are more common at the flowering and fruiting stage, which affects the normal growth of cucumber. Mainly infects leaves. At the onset of the leaves, a round water-soaked green patch first appears, and gradually expands into a nearly round or polygonal brown patch, with a halo of greenish and yellowish on the edge.

Bacterial pus is not easily visible on the back of the diseased leaf, which can be distinguished from bacterial keratosis.

It mainly infects the leaves of cucumbers, and the leaves appear in the early stage of the disease, and gradually expand into nearly round or polygonal brown spots, with a diameter of 1 2 mm, and the edge of the lesions is a halo of faded green to yellow, and it is not easy to see bacterial pus on the back of the diseased leaves. I think you can spray some fungicides, such as chitin and amino acid foliar fertilizers, which can play a role in disease resistance and sterilization. Cucumber leaf yellow is mainly due to lack of fertilizer, and it is drenched with water first in rural areas; Apply some organic fertilizer.

Remove the yellow leaves to keep the green leaves, and try to make the yellow leaves cover the edge of the cucumber tree roots; That is, moisturizing and rotting as fertilizer. Such cucumber leaves are green and beautiful.

Leaf blight is a bacterial disease, if the disease alone can be used to prevent and control this disease can be inorganic copper such as copper hydroxide or cuprous oxide spray, if it also prevents other pests and diseases or supplements nutrients, it is best to use organic copper such as thiamium copper or quinolinone mixed with other pesticides and fertilizers spray, if the leaf blight is serious, you can add spring leimycin mixed to increase efficiency. Cucumber leaf blight is actually downy mildew and target spot disease in the later stage of the symptoms, generally choose high disease-resistant varieties, the early stage of the disease is to distinguish downy mildew or target spot disease to prescribe the right medicine, generally use enoylmorpholine, chunleimycin, DuPont dew, agricultural streptomycin, methamethaline and other special fungicides, after the rain when the air humidity is high, you can spray Bordeaux liquid prevention.

The flower sprout is susceptible to disease, mostly lesions appear at about 35 cm from the ground, at first it is a water-stained small spot, and then it turns brown to dark brown oval or oblong spots, the edge of the lesion is dark brown, and the disease part is densely covered with small black spots, and the flower sprout turns yellow and dies in severe cases. When the humidity is high, the spot has a black mold layer. The small black dot in the diseased part is the conidia disc of the pathogen.

Cinnabar leaf mites are seriously harmed, and the disease also occurs seriously.

The symptoms of leaf blight are the formation of small water-soaked light yellow dots on the middle edge of the leaves, and then gradually spread from top to bottom, first with yellow-brown stripes, then grayish-white, and finally the leaves wilt. It is mainly prone to occur during continuous rainfall in May, especially when the plants are dense and the leaves are weaker.

That is, the soil is relatively dry, and the plants are infected, and pesticides are not sprayed in time.

1. The onset of the disease in the field generally begins in late April, and the onset of 5 6 accelerates, and the onset of rain and high humidity is serious.

2. Continuous planting of daylily or poor drainage, or rampant damage of leaf mites and serious disease.

Daylily leaf blight precautions.

1. Reasonable fertilization, pay attention to timely drainage, and avoid excessive water accumulation in the field or excessive surface humidity.

2. Select disease-resistant varieties and long-billed daylily varieties.

At the beginning of the disease, the cabbage heart blight produces water-like oval dark brown lesions at the base of the diseased seedling stem, which is slightly concave, and after expanding around the stem for a week, it causes the seedlings to wilt above the diseased part, and then gradually die, and the diseased seedlings stand more than lodging, so it is called standing blight. Pharmaceutical prevention: the seedbed is located in a higher terrain, well-drained place, the selection of disease-free new soil as a seedbed, strengthen the management of the seedbed, each square meter of seedbed with the original drug of Oxazalin to the fine soil stirred, before sowing the third of the medicinal soil sprinkled on the surface of the bottom water, after sowing, and then cover the remaining medicinal soil on the seed, so that the upper and lower pads, so that the seeds are sandwiched in the middle of the medicinal soil.

Or in the early stage of the disease, after pulling out the diseased strain, spray chlorothalonil, fucowet and other agents.

When planting choy sum, choose some medicines to prevent choy sum blight, mix them in the land where they are planted, which can effectively prevent choy sum blight.

At this time, there will be serious problems with the quality of the plant, and there will be a lot of pests on it, and the growth rate will be relatively slow; At this time, you can choose organic fertilizer or compost made of some enzyme bacteria.

There will be some black spots, and the leaves will also be particularly wilted, we should buy some pesticides to prevent pests and diseases, which can prevent this virus.

It is necessary to observe that if it is not there before, there will be an increase in the number of cases of enlargement, and it is likely that there is a genital wart infection.