How to prevent bacterial leaf spot in pepper?

Pay-off is to put the wires along both sides of the pole in preparation for hanging the wires on the cross arm. The following pay-off methods are commonly used (Figure 7-28):

Figure 7-28: Several pay-off methods.

a) Pay-off with pay-off frame (b) Pay-off with wooden frame (c) Pay-off with pulley.

1.Pit 2Ground 3Spool.

1) Put the wire by hand.

This method is suitable for thinner wires and shorter lines. When paying off the wire, the pay-off personnel hang a small bundle of wires on the arm, fix the wire head on the pole at the beginning of the first road, walk along the line, and use the other hand to put the wire out in a circle.

2) Use manpower, animal power or tractors, automobiles, etc. as the traction power wire with a pay-off can be used to pay off the wire, and an iron rod can also be used to penetrate the center hole of the wire reel, and then erected.

In order to prevent the wire from being worn when pay-off, a pulley can be installed on the cross arm, so that the pay-off speed is fast and labor-saving. When paying off, it should be noted that the wire shall not have defects such as hard bending, twisting, loosening, broken strands, abrasions, and broken strands. When setting up and pay-off, the wire reel should be supervised by a special person, and keep in touch with the pay-off personnel.

There should be a braking device on the pay-off frame, and when the line crosses the highway or navigable river, people should be sent to guard both sides of the highway and river. When the line crosses the communication line or broadcast line, the relevant department should be contacted in advance. There should be no joints when conductors cross railways, highways, navigable waterways, and important communication lines.

Pepper bacterial leaf spot disease is mainly harmful to leaves, and the leaves of the adult stage are diseased, with yellow-green irregular small spots at first, and then become reddish-brown, dark brown to rust-colored lesions after enlargement, and the lesions are membranous and vary in size. The junction of the sick and healthy departments is obvious. The disease spreads rapidly, and most of the leaves of the plant fall off in severe cases.

Control methods: Breeding disease-resistant varieties according to local conditions. Seed disinfection before sowing (seed dressing with 50% copper succinate wettable powder or 20% quinoxidone wettable powder by seed weight).

Clean the countryside. After harvesting, remove the diseased residues in time and plough the soil, and soak the field for a period of time (about 30 days or longer) in a place where the water source is convenient. Timely spraying to control the disease.

In the place or field where the disease is often affected, spraying and disease prevention should be started before the onset of the disease, in addition to referring to the prevention and control of chili pepper and bell pepper scab, you can also spray 50% dispersible granules (copper hydroxide) 600 700 times solution, or 50% formacarboxyl water agent 1000 1500 times solution, 2 3 times, every 7 15 days 1 time, dense before and after sparse.

The control measures for bacterial leaf spot disease of pepper are: Agricultural measures. Avoid continuous cropping, use high furrow cultivation, and cover with plastic film.

Pay attention to drainage during the rainy season and avoid flooding. After harvesting, remove the diseased remains or turn them deeply. Seed sterilization.

Before sowing, mix seeds with 50% copper succinate wettable powder or 50% dixone wettable powder or other fungicide by seed weight. Pharmaceutical prevention and control. At the beginning of the disease, spray 500 times of 50% copper succinate wettable powder, or 300 times of 14% copper ammonia aqueous solution, or 400 500 times of 77% copper hydroxide wettable powder, or 4000 times of 72% agricultural streptomycin, spray once every 7 10 days, and continuously control 2 3 times.

Bacterial leaf spot is a common bacterial disease on peppers, which often causes a large number of leaves, flowers and fruits in the early stage, affecting the yield. If under the condition of long-term high temperature and high humidity, the diseased spots on the leaves do not form scabs, but rapidly expand into leaf margins scorched or form many small spots on the leaves, and then cause a large number of leaves to fall off. Moreover, heavy crops, wetlands, and poorly grown fields are severely affected.

It can be used to effectively control bacterial diseases, and it is a special drug, and the effect can be seen in about 12-24 hours after spraying.

The most effective is to use copper hydroxide fungicide, which can kill bacterial leaf spot in peppers.

Propylene 500 800 times solution, neophytomycin 4000 5000 times solution, the use of these two insecticides is the most effective, can be used in the early stage of the disease.

I think the most effective is to use copper preparations, because the effect of this insecticide is very large, it can kill all the bacteria very well, so many people will use this insecticide.

At present, the more useful insecticide copper preparation has a very good effect, and the application range is very wide, and it will not cause pollution to the soil, so the cost performance is very high.

I am mainly engaged in facility cultivation, here combined with the actual production and book knowledge, talk about the greenhouse pepper bacterial leaf spot situation:

1. Symptoms. Pepper bacterial leaf spot mainly affects the leaves of pepper plants, and it is often the upper tender leaves that are affected first. In the early stage of the disease, the leaves appear yellow-green water-soaked oval or round small spots, and in the later stage of the disease, the lesions gradually change from brown to rust from the edge or tip of the leaf, and the leaves become thin and brittle, and easy to perforate. This disease is easy to occur in the high temperature and high humidity environment of the greenhouse, and the spread speed is relatively fast, often causing a large number of leaves in the late growth stage of the pepper plant, and the whole plant dies in severe cases, resulting in reduced yield and greater economic losses.

2. Prevention and control measures.

1. Greenhouse cultivation is especially taboo continuous cropping, and attention should be paid to reasonable crop rotation. Before transplanting, remove weeds and debris in the shed, and spray fungicides and insecticides on the surface of the shed for disinfection or stuffy the shed for 3 5 days.

2. Strengthen field management, turn the soil deep before planting, apply sufficient basal fertilizer, and the substrate cultivation effect is better. Reasonable dense planting, timely top dressing and watering after transplanting, pay attention to the appropriate proportion of nitrogen, phosphorus and potassium fertilizer, and preferably formula fertilization. In addition, special attention should be paid to ventilation in greenhouse planting.

3. Pay attention to observation and prevent it as soon as possible. At the beginning of the disease, spray 72% agricultural streptomycin 3000-3500 times or 47% Garinone wettable powder 800 times or copper hydroxide dry powder 600 times every 7 10 days, and spray 2 3 times continuously; In severe cases, it can be sprayed every 3 to 5 days, and attention should be paid to the alternating use of pesticides to prevent drug resistance and affect the prevention and control effect.

At the beginning of the onset of bacterial horn spot disease, you can see that the leaf lesions are green and water-immersed, and gradually turn into light brown, due to the restriction of the leaf veins on the back, the lesions will be irregular and polygonal, the lesions are also smaller, the color is light and whitish, and there is a small amount of white bacterial liquid overflowing, the lesions are also thinner, in the initial stage, the cucumber stems and leaves must show water-soaked small spots, with the development of time and disease, the water-soaked spots gradually decay, the color deepens and becomes brown, and finally the lesion site is dried up, and there are white marks on the upper surface.

When Pseudomonas syringae infects the host plant, they fly into the air in the form of particles, forming ice crystals that spread and reproduce in a form similar to "specific functions", which is the "snowfall" that vegetable farmers can sometimes see when bacterial keratopathy occurs. The true leaves of cucumbers are infected with bacterial horn spot, and the water-stained shape on the damaged leaves gradually changes from light green to light brown, and when the lesions expand, they will become polygonal due to the restriction of leaf veins. In later stages, the lesions are grayish-white and can be easily perforated.

If there is too much moisture in the cucumber field.

The leaves are severely diseased, and the cotyledons are water-stained and nearly circular depressions at the beginning of the disease, and then turn yellow-brown and dry. The spread of the pathogen to the young stem can cause the seedlings to soften and die, and the true leaf infection, the initial bright green water-stained small spots, and the polygonal light yellow-brown lesions limited by the leaf veins after expansion will also cause the harm of cucumbers and stems. After the onset of cucumber seedlings, round or oval water-soaked depression lesions are produced on the cotyledons, with a slight yellow-brown color, and then brown and dry.

After the true leaves of cucumbers are damaged, the initial damage is a pinhead-sized water-soaked spot, which slowly expands into polygonal, yellow-brown patches.

Blade. First, there are small water-soaked lesions on the leaves, and after the lesions are enlarged, they are polygonal, yellow-brown, with oily light, and there is no black mold layer on the back of the leaves. Cucumber horn spot mainly affects leaves, but also fruits and stems.

After the leaf is infected, it first appears pale green water-soaked spots, and gradually appears yellow-brown, light brown, light yellow, gray-white, and white, and the lesions on the back of the leaf are polygonal due to the restriction of leaf veins. When wet, there is milky white pus outside the lesion on the back of the leaf.

The branches and leaves are particularly wilted, and the surface of the pepper is dull and wrinkled, and there will be some black spots, which are all symptoms of leaf spot.

The symptoms of this condition are small, greenish, watery spots on the leaves, which gradually enlarge and turn into brown, iron-colored lesions.

The symptom of bacterial leaf spot disease in pepper is the presence of visible black spots on the leaves. The leaves are punctate, water-impregnated, irregular, and greenish at first, and then brown to rust-colored, with lesions film-like. When dry, the spots are rust-colored, brittle, and sometimes perforated.

Some plants with diseased leaves can still grow, and most of the leaves fall off, causing the entire plant to die. Irregular yellow-green spots appear at first, which enlarge to reddish-brown, dark brown to rust-colored spots. The spots are membranous and irregularly shaped.

What are the symptoms of bacterial leaf spot in peppers?

Hello, dear, I am glad to answer your answer: Pepper bacterial leaf spot disease, the symptom of bacterial leaf spot disease is a large number of leaf loss, fruit drop hazard characteristics Pepper cultivation in the solar greenhouse if high temperature and high humidity can easily lead to the occurrence of bacterial leaf spot, so that a large number of pepper leaves, fruit drops, flowers drop, has a great impact on the yield, and the degree of harm in production is no less than pepper anthracnose. Now the symptoms of the disease of pepper deficiency are found in the field, mainly to damage the leaves.

The adult leaves are diseased, with yellow-green irregular water-soaked small spots at first, which become reddish-brown or dark brown to rust-colored after enlargement, and the lesions are membranous and vary in size. When dry, the lesions are mostly reddish-brown. Once the disease is infected, the expansion rate is very fast, and a single leaf or many leaves on a plant are diseased, and the plant can still grow, and the leaf wood part falls off in severe cases.

Bacterial leaf spot disease has a distinct healthy junction but is not raised, distinguishing it from capsicum scab. Pathogen Pathogen and route of transmission Bacterial leaf spot in capsicum is caused by bacterial infection with Pseudomonas syringae. The pathogen mainly overwinters on seeds and diseased remains, spreads in the field by wind and rain or irrigation water, and invades from the wound of pepper leaves.

The appropriate temperature for the growth and development of the fungus is 25-28. When high temperature and high humidity, it spreads quickly, and the disease is serious due to poor drainage and barren and fertilizer-deficient land. Symptoms Onset conditions: no fumigation or incomplete disinfection in the solar greenhouse; The remains of diseased plants in the room are not cleaned up; Seeds are infected with bacteria, and the seeds are not disinfected before sowing; Failure to ventilate and drain moisture in time after irrigation in the greenhouse, resulting in high indoor temperature and humidity; After the harvest of the previous crop of vegetables, the soil is not deeply turned and exposed to the sun, and the cultivation of the next crop is also easy to cause diseases.

Prevention and control methods.

People who have planted peppers should know that pepper leaf spot, pepper leaf spot, is actually a common disease in our daily life, for this disease should be detected early, so as to ensure our pepper production, but many people do not know what causes pepper leaf spot, and they don't know what medicine is used for pepper leaf spot? Here's a brief introduction.

Peppers are generally watered in rainy days, which are easy to cause pepper leaf spot. Moreover, high temperature and high humidity last for a long time, which is conducive to the spread of diseases. Bacterial leaf spot disease of pepper has a fast onset and a high degree of harm, and it is difficult to prevent and control.

When dry, most of the leaf spot will be reddish-brown, once the disease is infected, the expansion rate is very fast, a single leaf or many leaves on a plant are diseased, the plant can still grow, and most of the serious leaves fall off.

Pepper leaf spot disease can generally be treated with 75 chlorothalonil wettable powder 500-600 times, 50 polymycolin wettable powder 1000 times liquid, etc., the effect is good.

Summary. Hello dear pepper seedlings have leaf spot disease, which can be treated by following the steps below:1

Remove the diseased leaves by hand: This is the first step in preventing the spread of the disease, cut off the leaves that have leaf spots, and remember not to touch healthy plants when handling. 2.

Spraying pesticides: Copper-containing fungicides (such as copper sulfate) can be used to control leaf spot, and attention should be paid to spraying all the fungicides, including the back of the leaves. 3.

Adjust the planting environment: Leaf spot likes moisture, so adjust the amount of watering to avoid over-wetting. At the same time, make sure there is enough space between the plants to allow air circulation and reduce humidity.

4.Planting disease-resistant varieties: The next planting, choosing disease-resistant varieties can reduce the occurrence of leaf spot to a certain extent.

After finishing it, it will be sent out together.

The leaves have black and white spots.

Hello dear pepper seedlings have leaf spot disease, which can be treated by following the steps below:1Manually remove the diseased leaf first:

This is the first step in preventing the spread of the disease, by cutting off the leaves that have leaf spots, and remembering not to touch healthy plants when handling. 2.Spraying pesticides:

Copper-containing fungicides (such as copper sulfate) can be used to prevent and control leaf spot, and attention should be paid to spraying fully when using fungicides. 3.Adjust the planting environment:

Leaf spot likes moisture, so adjust the amount of watering to avoid getting too wet. At the same time, make sure there is enough space between the plants to allow air circulation and reduce humidity. 4.

Planting disease-resistant varieties of jujube: the next planting, choosing disease-resistant varieties can reduce the occurrence of leaf spot to a certain extent.