Carrot bacterial leaf spot is a bacterial disease, how to prevent carrot bacterial leaf spot?

Carrot leaf blight occurs in every growth period, and the most harmful is in the early stage, which is easy to cause premature plant senescence and death. This disease mainly harms carrot leaves, flower organs, and petioles! The disease usually starts in the leaves.

In the early stages of the disease, there are distinct dark brown or yellowish-brown irregular round spots on the edges or tips of the leaves. In the later stage, as the spots expand, they will turn into dark brown necrotic spots, and there are obvious yellow halos around the necrotic spots! When it is severe, the pruned leaves are dry and wilted!

After the petiole infection, some brown spots appear in the early stages. If the humidity is high on rainy days, bacterial pus will appear in the affected area; Infected flower organs directly cause the withering and apoptosis of flower organs!

Carrot leaves are dry and have dark spots, which are mostly caused by bacterial diseases. Please stop them as soon as possible The bacterial disease of carrots, also known as black spot disease, mainly occurs in high temperature and humidity weather. When the temperature is above 30 degrees Celsius, it is very easy to have cloudy and rainy days!

Pathogens overwinter as diseased residues or seeds in the soil, and can be spread through agricultural operations such as rain splashes, active insect communication, and field irrigation! Pathogens can invade from the stomata or wounds of plants, so care must be taken to avoid obvious wounds such as broken branches of plants during breeding operations! Seed sterilization.

Before planting, seeds harvested from disease-free plants are used, and the seeds are generally sterilized before sowing. The seeds can be wrapped with 50% formabi and a new high-fat film, which accounts for the weight of the seeds. It can drive away underground pests and diseases, isolate virus infection, do not affect germination and swelling functions, enhance respiratory intensity, and improve seed germination rate.

The machine rotated to grow grain, beans, onions and garlic crops in the hardest-hit areas for more than 2 years. The field management is finely prepared and the well-rotted fertilizer is fully applied, and it is cultivated on high furrows or ridges. Timely tillage, soil loosening, weeding, and top dressing to promote root development.

Drain water in time after rain.

Removal of pathogens During the growth process, if the diseased plant of carrot spot blight is found, it should be set aside in time and taken out for centralized incineration or deep burial. Spraying foliar fertilizer in time during the sporing period of fleshy roots should make the nutrient delivery pipeline of underground fruits thicker, improve the swelling vitality of ground fruits, and make carrot fruits smooth, good quality and high yield. Chemical Control:

According to the requirements of plant protection, spray 500 times of 70% mancozeb wettable powder or 1 1160 200 Bordeaux liquid for prevention and control, spray 800 times of new high-lipid film to improve the utilization rate of active ingredients and consolidate the control effect.

Crop rotation is carried out in some lands with a relatively high concurrency rate. Improve the quality of the soil. These sick carrots should also be disinfected.

Fertilization should be carried out with artificial manure. Regularly remove soil loosening and weeding. You can spread a layer of mulch to prevent those germs from attacking.

There must be a good drainage system in the rice fields.

Be sure to choose the right seeds, such seeds can resist diseases, and must be soaked when sowing, which can also solve this problem, and be scientifically managed.

In the event of this disease, first of all, it is necessary to spray pesticides in time, and when selecting seeds, disease-free seeds should also be selected, and at the same time, watering and fertilizing should be done in time to do a good job in the management of water and fertilizer.

Carrot bacterial leaf spot disease is characterized by irregular yellow spots on the leaves of carrots, and the disease is very serious, which may cause carrot leaves to dry up, and eventually lead to carrot withering, because once carrots have this leaf spot disease, the whole carrot will be infected with bacteria, so it will eventually die.

The characteristic of this type of fungus is that it will produce some small yellow spots at the beginning, and then it will become round and irregular lesions, and then it will dry out due to lack of water, and then the leaves will be covered with lesions, and finally the leaves will dry up and die, and the petioles will also become dark brown stripe lesions, which will generally cause the leaves to wither and die in severe cases.

It will cause the stems and leaves of the plant to wither and die, which will seriously affect the growth of carrots and lead to a decrease in carrot production.

Bacterial spot disease mainly affects alpine radish leaves. When the plant is sick, irregular spots in the shape of water stains appear on the leaves for the first time, then the luster changes from light brown to dark brown, the spots are irregular in shape, thin paper shape, and initially occur on the outer, hinder, and inner leaves. Choose disease-resistant varieties.

Implement crop rotation for more than 2 years. Soak in 55 warm water for 10-15 minutes before sowing. If the diseased plant is found, it should be pulled out in time to remove the disease.

At the beginning of the disease, 20% water chestnut humidifying powder 800 times liquid or 47% Chunlei Wangdong humidifying powder 700 times liquid or 3% Mesozoic humidifying powder 600 times liquid or 20% mycocave suspension 1 000 times liquid spray was used every 5 days, 3 times in a row.

Carrot bacterial infectious diseases occur in every growth period, and the initial harm is the greatest, and it is easy to die due to premature plant aging. This disease mainly harms carrot leaves, flowering and petioles! It is more common from the leaves, and in the early stage of the disease, there are obvious black-brown or yellow-brown irregular round spots on the edges or tips of the leaves, and in the later stage, with the enlargement of the mole, it becomes a black-brown necrotic spot, and an obvious yellow halo appears around the evil death store!

When something serious happens, the branches and leaves wither! After the petiole is infected, brown long striped spots appear at the initial occurrence site, and the humidity is high during the rainy season, and the fungus appears at the affected area. Firearm inflammation directly causes firearms to wither and wither!

Carrot bacterial infectious disease, also known as black spot disease, mainly occurs in high temperature and high humidity weather, and the temperature is above 30 degrees Celsius in the continuous rainy season! Pathogens overwinter in soil diseases or seeds, and there are many ways to spread through rainwater splashing, insect activity, field irrigation and other farming operations! Well, it is not only fungi that cause keratopathy here, but bacteria can also cause keratopathy, so it is important to pay attention when preventing keratopathy.

First of all, it is necessary to determine whether the angle spot is caused by bacteria or fungi, and proceed with the symptoms accordingly**.

Since then, the patch has grown gradually as the germ spreads, but the growth of the patch is not unlimited. Restricted by the veins of the leaves, it is blocked by the veins of the leaves of the crop and becomes polygonal in shape, so we will call it horn spot. Here we would like to remind everyone that horn spot is different in color on other crops.

For example, horn spot on melon beans may be yellow or tan. Horn spot disease on crops such as mango, citrus, and persimmon is mainly black and black-brown, so it can be judged as a shape when judging horn spot, and the color can be used as a reference basis.

I probably have a variety of spots because of some pests and diseases, because this disease will reduce the yield of turnips, and there will be some very big spots.

The fungus overwinters with the diseased residue and can also survive the winter on the seeds. It spreads through wind and rain and watering. High temperatures, rain, and humid air are conducive to the onset of the disease. During the growing period, it is rainy or rainy, and the disease begins to occur after the rain.

At the beginning of the disease, water-stained brown spots appeared on the back of the leaves, the mesophyll was slightly concave, and the leaf surface was yellow-brown lesions, and the edges of the lesions were not obvious. Foliar lesions are grayish-white, membranous. When the humidity is high, the lesions on the back of the leaves are oily brown and rotten, and the lesions are soft rot and have a rancid smell.

When drying, it is easy to dry, brittle, cracked or perforated. This is mainly harmful to the parenchyma of the leaves, and the veins are not susceptible.

If the symptoms are not particularly severe, it is fine to cut off the black leaves with scissors. If there is already a large area of melanoma, be sure to spray targeted agents.

Select high-quality heat-tolerant radish varieties, and soak the seeds in advance with 50% Pythium wettable powder or gibberellin when sowing radish to improve the disease resistance of radish.

When planting, it is necessary to choose a place with high terrain and a place that is not easy to accumulate water. Usually water in moderation. Fertilize with fertilizers that contain high-quality fertilizers.

The leaves are infected with water-soaked irregular spots at first, and then turn to light brown to black shiny lesions. The lesions are irregularly shaped, paper-like, and occur mostly on the outer lobe at first, and then extend to the inner lobe.

The pathogen mainly overwinters in the soil with the diseased residues, and the surface and inside of the seed can also carry the bacteria. The pathogen is spread by rainwater, irrigation water and insects in the field, invaded by stomata and wounds, and the disease can be developed in the field after the incubation period of 5 to 7 days, and the disease develops rapidly in the field when the conditions are suitable. The pathogen prefers high temperature and high humidity conditions.

30 35. Frequent rainfall or heavy rainfall is easy to occur. Especially after the storm, due to the increase in wounds, the disease is severe.

Plots with severe disease were rotated for 2 years. Before sowing, the seeds were sterilized by soaking the seeds in 50 warm water for 20 minutes. Sow at the right time.

Autumn sowing should not be too early. At the beginning of the disease, spray 3000 times of 25% Vitalin soluble powder, or 600 times of 78% wave manganese-zinc wettable powder, or 3000 times of 72% agricultural streptomycin sulfate and other agents for prevention and control, 7 10 days 1 time, continuous prevention and control 2 3 times.