Leaf blight prevention and control methods, how to prevent and control leaf blight

1. Introduction to leaf blight.

Leaf blight, also known as leaf blight, is commonly found in plant maintenance. It usually erupts in 7-10 parts, mainly from the leaf edges, tips, and other parts. The disease will be more serious in the lower part of the plant, mostly caused by high temperature, high humidity, poor ventilation and other reasons.

Two. Governance Approach.

When the occurrence of leaf blight is mild, the diseased leaves should be removed in time, and the plants should be fully disinfected and sterilized. Then keep the environment well ventilated, expose to astigmatism, loosen the soil, and maintain the permeability of the soil. If leaf blight is severe, spray directly** and dilute according to the instructions of the drug until the pest is eliminated.

Three. Prevention and cure. The soil in which the plants are grown must be well-drained and fertile, avoiding high temperatures and humidity.

During the growth period, organic fertilizer, phosphate fertilizer and potassium fertilizer should be applied to enhance the stress resistance of plants. When planting in a large area, the planting density should be controlled, and the ventilation and light transmission of the growing environment should be maintained to reduce the spread of germs.

The methods of leaf blight prevention and control are: cleaning up diseased leaves, fertilizing, controlling cultivation density, changing watering methods, and spraying pesticides.

1. Clean up diseased fallen leaves

In autumn, the diseased leaves are completely removed and burned intensively to reduce the source of infection in the following year.

2. Fertilization

The soil is fertile, organic fertilizers and phosphorus and potassium fertilizers are added.

3. Control the cultivation density

Control the cultivation density, ventilation and light transmission, reduce foliar moisture, and reduce the chance of infection.

4. Change the watering method

Replace spraying with drip or running water to reduce the spread of pathogens.

5. Spray pesticides

During the growing season, in areas with severe disease, from late June to October, spray the drug every 10 days or so, and spray it several times to effectively prevent and control. Commonly used agents are 1:1:

100 times Bordeaux liquid, 50% Buzin 500 800 times liquid, 50% carbendazim wettable powder 1000 times (or 40% suspension 600 800 times, % benzrete 1000 1500 times, 65% sen zinc 500 times liquid, etc.

Symptoms of leaf blight:

Later, some small black spots are produced on the lesions. Such as osmanthus leaf blight (also known as blight), plum leaf blight, aster leaf blight (also known as spot blight). The diseased leaves turn yellow at the beginning, and the yellow part gradually turns brown and dies.

It extends from local to the whole leaf vein, showing brown to reddish-brown leaf margin lesions, with wavy edges and dark color.

The junction of the diseased bonds is obvious, and its outer edge sometimes has a shallow yellow band of unequal width and narrowness, and then the lesion gradually extends to the base of the leaf until the whole leaf turns brown to grayish-brown. This is followed by the appearance of black villi or small black dots on the dorsal or frontal surface of the diseased leaves.

The symptoms of corn leaf blight are harmful to leaves, leaf sheaths and bracts in the middle and late stages of maize growth. At the beginning, water-stained small round spots appeared on the diseased part, which gradually expanded into oval and long lesions along the direction of the leaf veins, and the lesions were 05～10 .

0cm, **gray-white to withered white, the edges are pale reddish-brown, and the junction of the diseased and healthy parts is very obvious. In the later stage, a black mold layer can be seen in the diseased part, the middle of the lesion is cracked and perforated, and the severe whole leaf is covered with lesions, which is tear-like dry and necrotic.

The pathogen is Alternaria spp., which is a fungus of the subphylum Semi-Knowitives. The conidia peduncle is light brown, straight or slightly curved. Conidia are clustered, fusiform, elliptic, inverted, inconsistent in shape, brown to light brown.

No beak or short beak. On the diseased tissue, the conidia are solitary or clustered, mostly flexural, with obvious sporulation scars and enlarged basal cells.

The transmission route is that mycelium or conidia overwinter on the diseased body or in the soil left with the diseased body, and the conidia are produced in the following year for primary infection and reinfection. Although the parasitic nature of the bacterium is not strong, there are many host species and are widely distributed, and the conidia formed on other hosts are also the primary source of infection of the disease in the growth period of maize.

Onset conditions. The rainy season, high humidity and extensive management in the field, weak plant growth, and planting susceptible varieties are all susceptible to the occurrence and development of the disease.

Prevention and control methods. a. Choose disease-resistant varieties, such as Pingdan No. 2, etc.

b. Carry out reasonable fertilization and take fitness and disease prevention measures to improve the individual quality of plants.

c. Spray 75% chlorothalonil at the beginning of the disease.

In autumn, the diseased leaves are completely removed and burned intensively to reduce the infection of the following year**. Strengthen cultivation management and control the occurrence of diseases. The planting land should be well drained, the soil should be fertile, and organic fertilizers, phosphorus and potassium fertilizers should be added.

Control the planting density to ventilate and transmit light, reduce foliar moisture, and reduce the chance of infestation. Switch to drip irrigation or running water irrigation to reduce the spread of germs. In the growing season, in the area with severe disease, from the beginning of the disease in late June to October, spray once every 10 days or so, and spray several times in a row can effectively prevent and control.

Commonly used agents are 1:1:100 times Bordeaux solution, 50% Tobuzin 500-800 times solution, 50% carbendazim wettable powder 1000 times (or 40% suspension 600-800 times, % benzelite 1000-15 00 times, 65% zebsen 500 times solution, etc., which can be used or used alternately.

Choose a flat terrain and well-drained plot for planting, apply enough organic fertilizer, reasonable dense planting, and timely top dressing to improve plant disease resistance. Pharmaceutical prevention and control: 500 times of 65% zebze, or 500 times of 64% alum, or 300 times of 14% copper ammonia aqueous solution, spray 1 time every 7 10 days, and spray 3 4 times in a row.

The following methods can be taken to control pepper leaf blight. Strengthen the management of the seedbed, use well-rotted farmhouse fertilizer as the base fertilizer, ventilate in time, control the temperature and humidity of the seedbed, and cultivate disease-free and strong seedlings. Implement crop rotation and remove sick and disabled bodies in a timely manner.

Strengthen field management, rational use of nitrogen fertilizer, increase phosphorus and potassium fertilizers, or apply foliar fertilizers such as spraying and phytobao; After planting, loosen the soil and top dressing in time, and drain the water in time in the rainy season. At the beginning of the disease, spray 800 times of 50% thiophanate-methyl sulfur suspension, or 400 times of 20% sodium dichloroisocyanurate soluble powder, or 600 times of 75% chlorothalonil wettable powder, spray once every 7 10 days or so, and continue to prevent and treat 2 3 times according to the condition. Discontinue the drug 7 days before harvest.

Leaf blight will cause the plant to dry up and fall off, affecting the appearance and health of the plant, once found, the diseased leaves should be removed in time to keep the environment ventilated and breathable. Spray 50% Dorling solution or other disinfectant once a week until the disease is completely eliminated from the plant.

1. Introduction to leaf blight

Leaf blight, also known as blight, is more common in plant maintenance, usually breaks out in 7-10 parts, mainly from the edge of the leaf, the tip of the leaf and other parts of the erosion, in the lower part of the plant will be more serious, mostly caused by high temperature and humidity, poor ventilation and other reasons.

Second, the governance method

When the occurrence of leaf blight is relatively light, the diseased leaves should be removed in time, and the plants should be comprehensively disinfected, sterilized and maintained. Then keep the environment well ventilated, with astigmatism, loosen the soil, and maintain the permeability of the soil. If the leaf blight is more serious, spray the drug directly, dilute it according to the drug instructions, and use it until the insect pest is removed.

3. Prevention and maintenance

The soil of planting plants must be well drained, fertile soil, avoid high temperature and high humidity environment, apply organic fertilizer and phosphate fertilizer and potassium fertilizer during the growth period to enhance plant resistance, control the plant density when planting in a large area, maintain the ventilation and light transmittance of the growth environment, and reduce the spread of germs.

What is the best medicine for leaf blight?

1. If leaf blight occurs on the plant, it can be used with 1:1:100 times of Bordeaux solution, 50% Tobuzin 500-800 times of solution, 50% carbendazim wettable powder 1000 times (or 40% suspension 600-800 times, % benzelite 1000-1500 times, 65% zeb 500 times liquid and other agents, which can be used for selection or alternate use, spray 1 time every 10 days or so, and spray several times in a row can be effectively prevented.

2. In addition to the use of pesticides for prevention and control, sufficient basal fertilizer should be applied at ordinary times to improve disease resistance; It is necessary to clean up the ditch system in time to prevent water accumulation after rain, so as not to provide good conditions for diseases; Frequent ventilation should be carried out to reduce the foliar humidity and reduce the chance of infection; It is necessary to remove diseased leaves and remove diseased leaves in time to reduce the source of infection; It is necessary to select disease-free seeds and promote crop rotation to prevent further infection of diseases.

1. If the plant is infected with leaf blight, it can be controlled with 1:1:100 times Bordeaux liquid, 50% Tobuzin 500-800 times liquid, 65% Dyszeb 500 times liquid and other agents, these agents can be used alternately, spray once every 10 days or so, and spray several times in a row to effectively prevent and control.

2. In addition to pharmaceutical prevention and control, scientific management should also be done to achieve a preventive effect. For example, apply sufficient basal fertilizer to improve plant disease resistance; timely ditch cleaning and drainage, cutting off the favorable conditions for the occurrence of leaf blight; Frequent ventilation to reduce foliar moisture and so on.

Strengthen cultivation management to control the occurrence of diseases. The planting land should be well drained, the soil should be fertile, and organic fertilizers should be applied.

and phosphorus and potash fertilizers. Control planting density, ventilation and light transmission, reduce foliar moisture, and reduce the chance of infection. Switch to drip irrigation or running water irrigation to reduce the spread of germs.

During the growing season, in areas with severe disease, from late June to October, spray once every 10 days or so, and spray several times in a row can effectively prevent and control the disease.

Commonly used agents are 1:1:100 times Bordeaux solution, 50% Tobuzin 500-800 times solution, 50% carbendazim wettable powder 1000 times (or 40% suspension 600-800 times, % benzollite 1000-1500 times, 65% zebsen 500 times solution, etc., the above methods can be selected.

Hello, I am glad to answer for you, the main damage parts of leaf blight: leaf margin, leaf tip. Alias; Blight: Lesions reddish-brown to grayish-brown.

Basic contents: White leaf blightWhite leaf blight mainly occurs on leaves and leaf sheaths. Leaf blight will cause the primary branches of the plant to dry up and fall off at the time of onset, so it is necessary to remove the diseased leaves and maintain a ventilated environment.

Spray 1000 times of 50% Dorling Bacteria WP or 600 times 65% Dyssen zinc solution every other week until the disease on the plant is completely eliminated.

Commonly used agents are 1:1:100 times Bordeaux solution, 50% Tobuzin 500-800 times solution, 50% carbendazim wettable powder 1000 times (or 40% suspension 600-800 times, % benzelite 1000-15 00 times, 65% zebsen 500 times solution, etc., which can be used or used alternately.

Leaf blight is a disease that mainly damages the leaves of plants, and if left unchecked, the disease can spread from one leaf to the leaves of the whole plant, causing the leaves of the whole plant to dry up and fall off. What is the best medicine for leaf blight? 1. If the plant has leaf blight, you can use 1:

1: 100 times of Bordeaux liquid, 50% Tobuzin 500-800 times of liquid, 50% carbendazim wettable powder 1000 times (or 40% suspension 600-800 times, % benzolite 1000-1500 times, 65% zeb 500 times liquid and other agents, can be used or used alternately, spray once every 10 days or so, spray several times can be effectively prevented. 2. In addition to the use of pesticides for prevention and control, sufficient basal fertilizer should be applied at ordinary times to improve disease resistance; It is necessary to clean up the ditch system in time to prevent water accumulation after rain, so as not to provide good conditions for diseases; Frequent ventilation should be carried out to reduce the foliar humidity and reduce the chance of infection; It is necessary to remove diseased leaves and remove diseased leaves in time to reduce the source of infection; It is necessary to select disease-free seeds and promote crop rotation to prevent further infection of diseases.

The main prevention and control methods of leaf blight are to completely remove the diseased fallen leaves in autumn and burn them intensively to reduce the infection of the second year**. The second is to strengthen cultivation management and control the occurrence of diseases. The planting land should be well drained, the soil should be good, and organic fertilizers, phosphorus and potassium fertilizers should be added.

Control the planting density to ventilate and transmit light, reduce foliar moisture, and reduce the chance of infestation. Third, in the production season of serious disease area, from the end of June to October, spray pesticides every ten days or so, spray several times can effectively give prevention and control, commonly used agents are 1:1:

100 Bordeaux liquid, 50% tob essence 50 to 800 times liquid, etc.

vitamins, supplemental vitamins.