Broccoli is particularly prone to black spot disease, what pesticide is good for treatment?

Broccoli black spot, also known as black mold, mainly damages leaves, stems, and petioles. The leaf disease usually starts from the outer leaves, which are water-stained dots at first, and then develop into brown to black dots, and the lesions rapidly expand into gray-brown round lesions when the temperature is high. Under humid conditions, the lesions are larger, 5 30 mm in diameter, and the lesions have black mold, and when there are many lesions on the leaves, they will merge into large spots.

The leaf is the main part of the black spot disease, and its surface and lower leaves are susceptible to infection on the front or back. At first, it appears as a nearly round pale green patch, with a diameter of 1 10 mm, which slowly expands and becomes dark brown in the middle, with pale green edges, with or without obvious ring lines.

Black spot disease mainly affects broccoli leaves, petioles, peduncles and horns. Both seedlings and adults can be damaged. The leaves are damaged, showing nearly circular green spots at first, and after enlargement, they are dark brown in the middle, pale green on the edges, with or without obvious wheel lines.

When wet, the surface is densely covered with black mold. Gray-brown to yellow-brown, most of them have obvious concentric ring lines, slightly concave, there are often yellow halos around the periphery of the lesions, and black-brown molds with ring-like distribution are produced on the front or back of the lesions, that is, the conidia and conidia of the pathobacteria, and the lesions are often perforated in the later stage. As long as they are not frost-damaged, the flower bulbs can grow slowly at a low temperature of 5 or even below.

Different varieties and different seedling ages have great differences in the temperature requirements required to complete vernalization, so the selection of varieties during annual cultivation is very important.

<> spray once every 7 days; Downy mildew: 58% Ruixin 600 times solution can be used in the early stage of the disease, or 64% alum 500 600 times solution; or spray 75% of the 600 times of the bacteriosis solution, spray 2 3 times continuously, spray 1 time every 7 days, and pay attention to alternate medication. The flower bulb at the top of the main stem is 14 18 cm thick, and after harvesting, several lateral branches can grow from the axils of the lower leaves, and small flower bulbs with a diameter of 1 5 cm can be generated at the apex.

Pay attention to the development of pastoral cleaning work. When the broccoli is harvested, it is necessary to remove the dead leaves produced in the field in time, reduce the source of the disease as much as possible, and eliminate the larvae hidden in the dead leaves, so that the insect population base can be effectively controlled. In winter, the vegetable patch is deeply turned.

Deep ploughing of vegetable patches in winter can accelerate the decay of broccoli and remove some of the overwintering larvae that may be present in them. It can be controlled with 50% anti-aphid wettable powder 2 000 3 000 times liquid, sprayed 2 3 times in a row, or 5% cypermethrin EC 1 000 times liquid or 25% fast kill emulsifiable concentrate 1 000 times liquid for control. An appropriate amount of spreader can be added to achieve the purpose of good control of aphids.

Polyantimycin, chlorothalonil, these two pesticides are often used, and have a very significant effect on this disease.

Broccoli is particularly prone to black spot disease in the process of planting, at this time, ternary compound fertilizer, urea, borax, ammonium molybdate can be used, according to a certain proportion, sprinkled on the planting ridge, which can be effectively controlled.

At this time, you can use some pesticides with relatively high concentrations, and you can also apply more organic fertilizer, and you need to water more.

Chlorothalonil, imidacloprid, mancozeb, Kaiser, pyridafen, etc., these drugs can remove this disease and ensure the income of farmers.

The prevention and treatment of specific drugs can be treated with chlorothalonil, promethin, polyantimycin, prochloraz, imazole and other alternate spray prevention and control, and it is recommended to add brassin, micro fertilizer to improve disease resistance.

To prevent and control broccoli black spot disease, it is best to choose a disease-free area to leave seeds, or leave seeds on disease-free plants to prevent seeds from carrying bacteria. Before sowing, soak and disinfect the seeds with 55 warm soup for 20 minutes, immediately move them into cold water to cool, dry them and sow them. You can also use 50% iprodione wettable powder by seed weight, or 50% fumebi wettable powder, 50% mancozeb wettable powder, etc., to eliminate the germs carried by the seeds.

During the growth period of broccoli, prevention should be the main thing and timely medication should be used. Before the onset or at the beginning of the disease, 50% iprodione wettable powder 1000-1500 times liquid, or 58% methamethaloxin? Manganese-zinc wettable powder 500 times, 50% ethylene sclerotium wettable powder 1500 times, 43% tebuconazole suspension 5000 times, 70% mancozeb wettable powder 500 times, 75% chlorothalonil wettable powder 600 times, 50% Pythium wettable powder 2000 times, 40% sterilized Dan wettable powder 400 times, 2% pyrimidine nucleoside antimicrobial water 100 mg liters of spray control, once every 7 days, spray 2-3 times.

Because jumping beetle pests can promote the spread of the disease, insecticides should be added appropriately when spraying. For cultivation in protected land, 1 kg of 5% chlorothalonil dust agent can be sprayed per mu, once every 7-10 days, sprayed 2-3 times, or 200-250 grams of 45% chlorothalonil smoke agent or 15% Pythium smoke agent, smoked in a closed shed for 6-8 hours, smoked once every 7-10 days, smoked 2-3 times.

**It is the spread of the pathogen through long-term residue through wind and rain during broccoli planting, which eventually leads to the onset of broccoli. At the same time, the external factors are also the relatively short incubation period, insufficient amount of fertilizer, and unscientific field management. Nowadays, broccoli is growing in an increasing area, and the scale of the industry is gradually rising, becoming one of the very common crops on the table.

However, in the process, broccoli also developed a more serious black spot disease. The incidence of this disease is very high, and it directly affects the taste and sales of broccoli, and in severe cases, there will be extinction. Therefore, it is necessary to understand the symptoms, causes and rules of broccoli disease, and then carry out targeted prevention and control.

Melanoma** AnalysisThe main cause of black spot disease in broccoli is caused by the pathogen, which has a very strong survival rate and can cause black spot disease by remaining in the diseased residue, plant and soil. Even the germ can survive the winter with ease, and the infection starts when the conditions are right. After the onset of the disease, the meristem can even be transmitted and infected many times through wind, rain and wateringUnder normal circumstances, the temperature after rain will be between 25 and 31 degrees, which is very easy to get sick at this time, and if the fertilizer applied by the grower is of low quality and the amount of fertilizer applied is not enough, it will lead to the growth of broccoli is relatively weak, which will aggravate the disease because of its unreasonable management.

Onset symptomsThis disease can also be called melanoma, and its main damage areas are leaves, flower bulbs, etc. After infecting the leaves, it gradually forms black round spots, about 1 mm to 10 mm in size, and the wheel pattern is not very clear. If the number of lesions on the leaves gradually increases and the area gradually expands, the small lesions will slowly turn into large lesions, causing the leaves to gradually turn yellow and wilt.

This is followed by rhizomes and petioles, but the lesions are streaked in shape and have black mold. The onset of this disease is relatively short and very harmful, so it needs to be treated carefully. <>

The control measures should first pay attention to crop rotation, preferably and non-cruciferous vegetables, and then use the high furrow cultivation method to carry out drainage work in time after high temperature and rain to reduce soil moisture. Secondly, the diseased residue should be cleaned up immediately after harvesting, and the disease resistance of the plant should be enhanced by deep turning and fertilization. Finally, ecological control methods can also be used to change the temperature and humidity during planting to promote the vigorous growth of broccoli, and pesticides such as chlorothalonil powder can also be used for control.

If you want to prevent and treat black spot disease, you should not only analyze its symptoms, but also find the cause of the disease, and then prevent and treat it in time to avoid the spread of the disease.

The cause of this disease is generally due to too much watering, which leads to a decrease in the resistance of the plant, which leads to fungal infection.

This situation is likely to be caused by too many bacteria on the broccoli, which will also affect many things, and will also make the broccoli unable to thrive.

This is because the planting area is very humid and the soil is too humid, so some germs can grow well.

Prevention and control agent: 40 to 50 grams of 20% leaf dry azole (spring thunder king copper, Zhongshengmycin) mixed with 30 catties of water to the head of the mango tree, according to the size of the tree to increase or decrease the agent, small to 40 grams, large to 50 grams. Liangguoan spray is used at the leaf stage, flowering stage and fruit growth period respectively to supplement nutrition, increase the thickness of the waxy layer of leaves and fruits, increase the chlorophyll content, improve the self-trophic ability of mango, and can prevent sunburn and other diseases.

<> is mainly caused by bacterial and fungal calcium and magnesium deficiency, which can be prevented by supplementing calcium and magnesium fertilizer in advance and applying more lichen spore agents. Once produced, it is sprayed mancozeb + amino acid calcium magnesium foliar hypertrophy in the early stage of bacterial horn spot disease of Chinese cabbage, oily spots are produced on the leaves, light brown to brown, gradually to black-brown, the lesions are polygonal, and the leaves are partially rotten and odorous in the later stage. According to the investigation, the bacterial horn spot disease of Chinese cabbage began to occur 12 days after the emergence of Chinese cabbage seedlings (seedling stage).

Angular spot is also known as bacterial melanoma or ulcerative disease. It is mainly harmful to shoots, leaves and fruits. The small black spots of the size of the needle on the infected leaves of the new shoots that have not turned green, and then expand into small black spots that are raised, there are yellow halos around, and the lesions are polygonal, and the later lesions are fused into irregular large black spots The chemical agents used in the current routine prevention and control can only play a role in killing the bacteria on the surface of the tree, and the disease may be controlled in a few days after the use of medicine, but after the storm or typhoon, it will be reversed.

Bacterial horn spot not only harms the leaves, but also seriously affects the fruit, it is necessary to use Liangguoan 100-150 times + garlic oil 1000 times + chemicals together, spray, once every 3-5 days, and add chemicals at intervals. The effect is good, and recently it is also the last period of prevention and control of bacterial keratosis to restore the land, the long-term use of chemical fertilizers, pesticides, the structural acid-base balance of the land has been destroyed, the trace elements in the nutrients can not be absorbed by plants, and the beneficial bacteria are reduced. Biological bacteria can release trace elements in the soil, which have nitrogen fixation and carbon fixation and provide more and better nutrients for fruit trees.

The broccoli pathogen mainly overwinters on diseased leaves in the seed seat or hyphae, and the conditions are suitable in the following year, producing conidia, which are spread by air currents. The southern part of the country is prone to the occurrence of warm winter and spring, fog and heavy dew.

**Method; 1) Implement crop rotation and strengthen field management.

2) At the beginning of the disease, spray 500 times of 40% polysulfur suspension or 1000 1500 times of 50% benomyl wettable powder, 500 times of 70% thiophanate-methyl wettable powder, and 1000 times of 50% domocarb (carbendazim plus vanmycolin) wettable powder, once every 7 10 days, and 2 3 times of continuous control.

The pathogen mainly overwinters on diseased leaves in seed seats or hyphae blocks, and the following year when conditions are suitable, conidia are produced, which spread by airflow. The southern part of the country is prone to the occurrence of warm winter and spring, fog and heavy dew. At the beginning of the disease, spray 800 times of 50% thiophanate-methyl sulfur suspension or 1000 times of 50% benomyl wettable powder, 500 times of 50% lysobacteryl wettable powder, and 1000 times of 50% mycocarb (carbendazim plus vanmycolin) wettable powder, once every 7-10 days, and 2-3 times of continuous prevention and control.

It may be because you don't do some regular spraying to suppress pests, or you don't get enough sunlight, you can use some special pest removal agents to spray to drive away pests.

Symptoms are the appearance of round greenish patches and, when wet, black mold on the surface.

There will be a lot of spots on the leaves, and the cauliflower is also very sluggish, and it is also very prone to rotting, and often dies in a large area.

First of all, there are a lot of lesions on the cauliflower, and there will be spreading, and the surrounding ring patterns are not particularly obvious, and it will cause the leaves to turn yellow and wither.

Select excellent varieties with strong disease resistance before sowing with new high-lipid film to prevent seeds from carrying pathogens, reasonable fertilization, timely cultivation and weeding, in order to facilitate ventilation and cooling, timely drainage after rain, to prevent water accumulation or excessive humidity in the field, in the early stage of the disease, spray targeted agents plus new high-lipid film, spray once every 7-10 days, spray 2-3 times, can effectively prevent and control leaf spot disease and can prevent the spread of pathogens.

Reasonable fertilization, the autumn seedlings are cultivated, enhance disease resistance, after picking yellow flowers to the daylily leaves die, remove the disease residues of the autumn seedling field in time, concentrate on burning or deep burial, when the spring seedlings have a large number of new leaves, do not apply too much nitrogen fertilizer.

Be sure to spray some pesticides, and you can also spray some salt water, ventilate more, and keep the environment dry.

When we want to develop daylily planting, we must pay attention to choosing some good varieties, such as using existing disease-resistant varieties such as Mayflower, white flower, radish, etc., and then breeding some disease-resistant varieties after sexual hybridization. It is recommended that you choose targeted training. From many years of planting experience, in the cultivation and management of daylily, the longer the daylily is planted, the more serious the disease, and the daylily planted for less than 15 years has a lower incidence due to the robustness and strong disease resistance.

In places with better winter management, the incidence of daylily leaf spot is milder.

Daylily leaf spot mainly overwinters on dead leaves of autumn seedlings with hyphae or conidia. The following spring, the spores germinate, infecting the leaves or seedlings. After an incubation period of 3 days, the disease appeared.

After 6-7 days, conidia are produced in the affected area for reinfection. Dead spring daylily, the fungus can infect the dead leaves and autumn seedlings on the flowers. Partial application of nitrogen fertilizer led to slow leaf growth, high soil viscosity, extensive management, and serious diseases.

The above drugs should be used alternately or in combination to improve the control effect, and mycelium or conidia mainly overwinter on the dead leaves of autumn seedlings. The following spring, the spores germinate, producing germ tubes that infect the leaves or seedlings. After an incubation period of 3 days, the disease appeared.

After 6-7 days, conidia are produced in the affected area so that they can invade again. Dead spring daylily, the fungus can infect the dead leaves and autumn seedlings on the flowers. Partial application of nitrogen fertilizer led to slow leaf growth, high soil viscosity, extensive management, and serious diseases.

Reasonable fertilization, cultivate autumn seedlings, enhance disease resistance, quickly cut seedlings after picking yellow flowers, remove disease residues in autumn seedling fields in time, and concentrate on burning or deep burial. When spring seedlings release a large number of new leaves, do not apply too much nitrogen fertilizer, and pay attention to timely renewal and rejuvenation of old plants. At the beginning of the disease, spray 50% carbendazim wettable powder 1500 times, 70% thiophanate-methyl wettable powder 500 times, or 75% chlorothalonil wettable powder 500 times, 60% anti-milcopro ultrafine powder 600 times, once every 7-10 days, continuous prevention and control 2-3 times.