How to treat downy mildew? The difference between gray mold and downy mildew

Prevention and control measures. 1. Reasonable dense planting, no more than 12 plants per square meter of area, and the leaves should not be shoulder-to-shoulder.

2. Reasonable fertilization, balanced nutrition, more organic fertilizer, under the premise of sufficient nitrogen fertilizer, more phosphorus and potassium fertilizer in the reproductive growth period to enhance the resistance of plants. And spray the flower Zhuang Tiling at the bud stage of the moon season to promote the strong flower buds, hypertrophic petals, bright flower color, rich flower fragrance and prolonged flowering period.

3. Clean up the residual branches and fallen leaves in time and destroy them in a centralized manner. Apply callus antiseptic film to the trim mouth to prevent bacterial infection and protect the healthy healing of the wound. After the plant is susceptible, it is controlled with targeted agents.

Control methods: 1) Cultivation technology for disease prevention: select varieties with strong disease resistance; Completely remove the diseased and residual body, combined with pruning to remove the diseased branches, etc.; The scaffolding should be trimmed in a timely manner to facilitate ventilation and light.

2) Pharmaceutical protection: Commonly used agents are 50% enoylmorpholine, 35% methafin, frosturea cyanide, sharp puff, and evil frost spirit. Manganese, zinc, downy mildewcarb, etc.

Considering that downy mildew and gray mold are more serious, if you blindly pursue post-event prevention and control, it will definitely not be of much significance. Therefore, only by taking prevention and control measures based on "prevention" and supplemented by "**" can we fundamentally solve this problem.

From the point of view of the causes of downy mildew and gray mold, although one is high temperature and high humidity, and the other is low temperature and high humidity, many measures are the same in the early stage of prevention, so we only distinguish them in the later stage of the first medication.

Downy mildew, a disease that is more headache than black spot disease, master the method and use the right medicine to prevent and control it as soon as possible.

**Different: Botrytis is caused by Botrytis viniferais at a temperature of 20-25, and downy mildew is caused by downy mold at a temperature of 10-30.

The symptoms are different: gray mold infects flowers, leaves, and stems, and light brown water-stained spots appear on the infected site, which begin to rot after enlargement, and downy mildew infects leaves and new branches, and irregular green patches appear on the infected site.

First, ** is different

1. Botrytis cinerea.

It is a low-temperature, high-humidity fungal disease caused by Staphylospora fungus, which occurs when the temperature reaches 20-25 and the humidity exceeds 90%.

2. Downy mildew.

It is a high-temperature, high-humidity fungal disease caused by downy mildew, which occurs when the temperature reaches 10-30 and the humidity exceeds 90%.

Second, the symptoms are different

1. Botrytis cinerea.

1) The main lesion sites are flowers, leaves, and stems, and the leaf tips and leaf margins are infected first, and light brown water-stained spots will appear at the infected sites, and the lesions will begin to rot after enlargement.

2) When the petals are attacked by germs, some of the petals appear brown and shrunk and become rotten.

2. Downy mildew.

1) The main disease sites are leaves and new branches, and the whole plant will be infected in the later stage of the disease, and the scope of infection is large, and other diseases may be induced during the infection period.

2) At the beginning of the disease, irregular greening spots appear on the back of the lower leaves of the plant, and then covered with a frost-like mold layer, which will gradually change to dark purple water-soaked and finally brown.

3) In the later stage of the disease, the lesions are polygonal and burned, and then wither and fall off, and the newly grown young leaves and branches will still be infected, and so on.

Third, the mode of transmission is different

1. Botrytis cinerea.

Conidia are transmitted by wind and rain, invade from wounds or epidermis, and then infect the entire plant.

2. Downy mildew.

The pathogen overwinters on seeds or diseased residues, and when the temperature rises the following year, it spreads by means of air currents, rain, microbial activity, etc.

The treatment for the disease is proper pruning, spraying, and regular ventilation.

1. Proper pruning.

Plants need to be pruned after the occurrence of branch blight in the monthly season. First of all, you need to choose scissors with sharp edges, and then use scissors to cut off the branches on the plant that are infected by germs to prevent bacteria from infecting other healthy branches, and at the same time, you need to burn the pruned branches after pruning to avoid infecting other healthy plants.

2. Spray the agent.

After pruning, the plants need to be sprayed, which can generally provide carbendazim solutions to the plants. First of all, you need to choose a watering can with a thin spout, then pour a cap of medicine into the watering can, then fill the watering can with water, shake it evenly, and then spray it on the plant to destroy the bacteria on the plant.

3. Regular ventilation.

At the same time, in order to prevent the recurrence of bacteria on the plants, it is necessary to ventilate the plants regularly. First of all, you need to cut off the branches and leaves that grow too densely on the plant, and then put the plant in a well-ventilated environment, so that the plant can grow healthily, and you need to pay attention to the change in temperature when ventilating, and when the temperature is too low, you need to move the plant indoors to avoid frostbite of the plant.

The method of cultivating reeds in the moon flower

1. Lighting conditions.

When cultivating moonflowers, they need to be placed in a brightly lit environment to allow the plants to receive all-weather natural light and promote photosynthesis, but in the middle of summer, the plants need to be moved to scattered light to avoid sunburn. Sedan chair.

2. Top topping.

When cultivating moon flowers, you need to pluck the topping in February and March every spring, you can use sharp and sterilized scissors to cut off all the leaf tips at the top of the plant branches, eliminate the top advantage, promote the germination of side branches in the month, and cut off the diseased and weak branches with poor growth in the month.

3. Top dressing management.

The nutrient requirements of the moon flower are different in different growth stages, when cultivating the moon flower, it is necessary to apply the rotten organic fertilizer or cake fertilizer once a month during the plant growth period to promote the flower bud differentiation, and after the moon flower blooms, it is necessary to apply phosphorus and potassium fertilizer and urea.

Summary. If downy mildew occurs, you must do these three things:

The first point is to spray quickly, which can be sprayed with several agents for the prevention and control of downy mildew;

The second point is to strengthen ventilation, reduce humidity, water control, downy mildew is a lot because of poor ventilation, there is also after watering if the soil moisture is too high will also lead to downy mildew, in early spring, autumn and winter if the temperature is too low, downy mildew will also break out in the greenhouse.

The third point is to strengthen sunlight, strong sunlight and exposure, which can also reduce the harm of downy mildew.

Should we pay attention to fertilizer and water for downy mildew?

If downy mildew occurs, we must do these three Zen signs: the first point is to spray quickly, which can be sprayed with several agents for the prevention and control of downy mildew; The second point is to strengthen ventilation, reduce humidity, water control, downy mildew is a lot because of poor ventilation, and if the soil moisture is too high after watering, it will also lead to downy mildew, in early spring, autumn and winter, if the temperature is too low, the greenhouse will also break out downy mildew. The third point is to strengthen sunlight, strong sunlight, exposure, can also be oak yards to reduce the harm of downy mildew.

With downy mildew, can you hand over fertilizer water?

Hello, you can't water fertilizer, water normally.

Prune branches and leaves: Use sterilized sharp scissors to cut off diseased leaves. Spraying agent:

Spray 50% carbendazim solution to the monthly season for prevention and control. Strengthen maintenance: apply nitrogen, phosphorus and potassium compound fertilizers every 10 to 15 days to improve the disease resistance of the month.

Precautions: Choose varieties with strong disease resistance for planting.

1. Prune branches and leaves

When infected with leaf litter disease in the current month, it is necessary to use sterilized sharp scissors to cut off the diseased and insect leaves, so as not to infect the remaining healthy plants, and spray the leaves with disinfection and sterilization agents for disinfection and control.

2. Spray the agent.

One month before the high incidence of leaf blight, spray 90% chlorothalonil 500 times solution to the leaves for prevention, if the plant is infected with the disease, it is necessary to use 50% carbendazim 500 times solution for prevention and control, pay attention to spraying, to ensure that the environment is ventilated and breathable.

3. Strengthen maintenance

After spraying, it is necessary to strengthen the management of water and fertilizer in the monthly season, and can wait for the soil to dry out, and water the plants once permeable, but there can be no water accumulation, and every ten to fifteen days to apply nitrogen, phosphorus, potassium compound fertilizer to improve the disease resistance of the monthly season.

4. Precautions

In order to prevent and control leaf blight, you can choose varieties with strong disease resistance for planting, pay attention to the seeds before planting, soak the seeds in carbendazim solution to increase the disease resistance of the plant, and wait for the seeds to emerge, the seedlings that grow too weak and dense will be removed to ensure that the ventilation effect between the plants is good.