Walnut bacterial melanoma is more serious, how to use walnut bacterial melanoma

The appropriate pesticide should be selected, mixed according to the proportion, sprayed after the rain, and after spraying, the surrounding dead branches and leaves should be cleaned up in time to reduce the re-infection of pests and diseases, and the drug should be sprayed for 1 2 days after watering on time to maximize the effect.

Drug prophylaxis should be carried out before germination, and at the same time, the drug should be divided into several time periods, such as late May, mid-June and late June, and it should be prevented in stages, and the wound should be repaired in time to prevent infection.

1.Spray 3-5 Baumé stone sulfur mixture once before germination to eliminate overwintering bacteria. 2.Spray 1 3 times during the growth period: 200 Bordeaux liquid, or 50% methyl tobuzin or 500 800 times of antibacterial special wettable powder, spray many times, the effect is good.

It is necessary to apply some ointment to its trunk and branches after falling leaves, which can have the effect of heat preservation and frost prevention, and can spray pesticides on his tree, which can be wrapped in a protective film, and can also enhance the efficacy, so as to effectively prevent rainwater pollution.

It is necessary to prevent before germination, maintain the drainage performance of the soil, and spray the disease if it is found, which can be protected with streptomycin and some Bordeaux liquid.

If the disease has been on, then it is necessary to spray pesticides in time and reconcile them according to a certain proportion, so that they can be effectively prevented.

The method of prevention and control is to first choose disease-resistant walnut varieties to plant, and then cover the greenhouse with mulch, maintain temperature, spray pesticides regularly, and prevent the emergence of this disease on the rhizomes and leaves of walnuts.

Walnut treesThe special drug for black spot is available for walnut tree black spotMethyl tobuzin+ tetramycin or methyltobuzin + agricultural streptomycin orChunleimycin, octylam, copper thiazine and other agents are used interactively, and the spraying should be uniform, whether it is the leaf surface, the back of the leaf or the new shoots.

Walnut black spot is a bacterial disease, also known as black rot, which is the main disease of walnut fruits and leaves, and it is common and serious in walnut producing areas. The disease mainly affects walnut fruits, leaves, tenders, buds and female inflorescences. Causes the fruit to turn black, rot, and fall early, so that the kernels.

Shriveled weight loss, reduced oil yield, and even inedible.

1. 5 prevention and control methods.

Choose disease-resistant varieties, reasonable planting density and reasonable shaping and pruning, so that the tree structure is reasonable, the branches and leaves are evenly distributed, and good ventilation and light transmission conditions are maintained.

Strengthen fertilizer and water management, improve tree potential, and enhance disease resistance; Timely pruning or removal of diseased branches, diseased leaves, diseased fruits, walnut peels after harvesting, concentrated burning or deep burial, reduce the source of overwintering bacteria.

Timely control of pests such as walnut limb moths, and try to use less stick knocking when picking fruits to avoid damage to branches, reduce wounds, and reduce the chance of bacterial infection.

Before germination, in early to mid-March, carefully spray a stone sulfur mixture, after germination, flowering and flowering, you can spray 70% methyl tobuzin agricultural streptomycin sulfate, 57 months every 15 days, can be with allicin, copper oxalate or 10Bordeaux liquid.

and other agents to prevent the development of drug resistance.

Walnut black spot disease occurs on leaves, twigs, flowers and fruits. After leaf damage, small brown spots that are nearly round and polygonal first appear on the veins. In severe cases, they can heal each other.

The leaves appear perforated in the later stage, the lesions on the petiole are long brown and slightly sunken, the diseased leaves are shrunken and deformed, and when the trees enter the growth period, they also need to spray 1:05:200 times of Bordeaux liquid, of course, the effect of spraying copper oxalate is also very good, you can also use the concentration of agricultural streptomycin plus 2 copper sulfate, spray once every half a month, spray multiple times, you can also achieve good results.

The dry rot of walnut trees mainly harms its branches, and pathogenic pathogens will infect young branches and trunks, and in the early stage of the disease, brown round lesions will appear on the branches or branches, and the lesions are slightly raised, and the juice can flow out by pressing. With the aggravation of the disease, the lesions on the branches will gradually increase and expand, parathion microcapsules or 25% phosphine microcapsules, according to 250 grams per mu, mixed with 25 50 kg of water, evenly and carefully sprayed. Before spraying, the ground weeds should be removed, and it is best to plow the ground soil after spraying to prolong the effect, and the second treatment should be carried out according to the same method after 20 days.

Because walnut tree rot disease causes the external cortex to decay and drain black water, it is also called "black water disease". The rot disease of walnut tree is a fungal disease caused by the fungus of the subphylum Semi-Knowitives, which mainly harms the main side branches of the tree, and begins to rot from the subphloem layer of the diseased part, mostly in the form of water stains, and the later lesions are gray or perforated, and the whole leaf is black, brittle, and incomplete when it is severe. The lesions on the petioles and young shoots are round or irregularly shaped, black-brown and slightly concave, and the lesions surround the branches, causing dead shoots and leaf drop.

Virus control. For diseased trees, it is necessary to spray the whole garden in time with a new high-fat film to form a protective film to enhance the efficacy, and use ulcer to spray the whole garden to kill germs and nourish the tree. Prevent and control germs to spread through wind and rain.

In severe cases, the upper segment dies due to the expansion of the lesion and the protective branches. When the young fruit is damaged, small black spots appear on the fruit surface, without obvious edges, and then gradually expand into pieces and turn black, and penetrate deep into the pulp, so that the whole fruit and the kernel all turn black and rot and fall off. After the inflorescence is invaded, it produces black-brown water-stained lesions.

It is necessary to choose disease-resistant varieties, and at the same time to turn over the soil, do a good job of weeding, and at the same time clean up all the diseased fruits and leaves in the orchard, and at the same time use more nutritious fertilizers, do more pruning work, and use professional agents, so that walnuts will not appear black spot disease.

Usually pay attention to pruning, you can also use pesticides to prevent and control, regular fertilization, and clear the garden in winter, in fact, the dead branches and fallen leaves and pests on the ground caused by fruit drop in time to clean up.

You can often prune branches and leaves, fertilize, so that you can also enhance the ability to resist disease, you can also use the method of pesticide control, spray some insect repellents, so that you can control it well.

During the planting process, it is necessary to pay attention to the surrounding environment, maintain the temperature and humidity of the soil, and pay attention to the time of watering.

Walnut tree black spot disease can be used interactively with methyl tobuzin, tetramycin or methyl tobuzin, agricultural streptomycin or chunleimycin, octachlor, thiamium copper and other agents.

Spraying should be even, whether it is the leaf surface, the back of the leaf or the new shoot. Usually to strengthen management, timely cut off diseased and insect branches, dense branches, etc., improve ventilation, use stone sulfur mixture before germination to eliminate germs, and use Bordeaux liquid and agricultural streptomycin spraying during the growth period for prevention and control.

Walnut black spot disease is caused by the pathogenic type of walnut black spot of brassica niglanex, and occurs in walnut, mainly for young fruits, leaves, and shoots. The disease causes leaf wilting and early fall, young fruit rot and early fruit drop.

The young fruit is infected, and the fruit surface is small brown spots, without obvious edges, slightly convex, and then gradually expands, turns black and sinks, penetrates deep into the kernel shell and kernel, so that the whole fruit and the kernel all turn black and rot and fall off.

After the occurrence of walnut black spot disease, the kernel yield and oil yield of the diseased fruit can be reduced. According to the investigation of Zuoquan and other places in Shanxi, the general damage rate of plants is 60-100, the fruit damage rate is 30-70, and the severe ones are more than 90. The weight of the kernels can be reduced by 40-50, and the oil yield of the damaged walnut kernels is reduced by nearly half. The occurrence of this disease is related to the damage of walnut lifting moths, so it has become an important threat to walnut production.

Agricultural control of walnut black spot

1. Prune the leaves

After the walnut tree is infected with black spot disease, the diseased branches and leaves should be pruned to prevent the spread of the disease, and then the cut branches and leaves are stacked in an open place and burned.

2. Keep ventilation

Good ventilation is essential for the growth of walnut trees, and during the growth of the plant, the dense leaves can be cut off by a bench to improve the ventilation between the canopies, and when the weather is hot, the walnut trees can be blown by an electric fan.

3. Reasonable water and fertilizer

In the process of breeding walnut trees, it is necessary to apply sufficient fertilizer to it, which is conducive to improving the disease resistance of the plant, mainly based on compound fertilizer rich in nutrients, and in the rainy season, it is necessary to reduce the watering of walnut trees, and to discharge the water in the soil.

After the walnut tree is infected by fungi such as anthrax spores, it can not only harm the walnut fruit, but also the leaves, branches and buds of the walnut tree will also be harmed to a certain extent. Walnut black spot disease is mainly manifested by black spots on walnut leaves (which may even roll inward in the later stage), and sometimes the petiole will also grow lesions. At the time of fruit damage, the skin of the fruit initially appears as a slightly raised brown soft spot, which will gradually expand and gradually turn black, and in severe cases, the kernel will also turn black and rot.

It will secrete bacterial sap, which can damage walnut tree strips, leaves, and fruits. In terms of time, it generally starts in May every year, and is most obvious in June-July, with obvious characteristics of leaves and fruits. After the disease infects the fruit, the surface of the green skin of the fruit in the early stage produces black and black-brown round or nearly round lesions, and in the later stage, the lesions expand to the skin, and many small black dots are concave and arranged in the form of concentric rings, and sticky bacterial conidia discs and conidia appear on the lesions when wet, <>

The disease is gradually hardened by the core shell, and the disease is confined to the outer layer**, which is less harmful. In the first lesion, small black spots appear along the veins, enlarged into nearly circular or polygonal black-brown spots, watery translucent halos. Black spot disease can generally be treated with agents such as mesomycin or thiazolezinc or gallinone or thiamethox copper or chlorobromoisocyanuric acid.

Anthrax can be alternated with difenoconazole or anithoxystrobin or anthrax formome or etoxystrobin, while brown spot disease is generally used difenoconazole or domibenether and other agents, <>

walnut birlettin". Extracted from the green peel of walnuts, it contains substances such as tannin (i.e., tannin acid) and gallic acid, which turns black after oxidation, and is most suitable for coloring in hair dyes. This is why walnuts turn black when they are almost ripe.

Walnut black spot is also known as walnut bacterial black spot, walnut black, black rot. The pathogen generally overwinters in the branches or buds, and the bacterial liquid secreted in the next spring spreads through wind and rain, mainly harming young fruits, leaves and shoots.

The bacteria festered on the branches from top to bottom until a tree died, which is caused by the rain for too long.

The temperature was too high, and the soil was too hot and humid, and there was no management skills, as well as no watering and fertilizer, which eventually caused the disease.

Walnut black spot disease is a bacterial disease. And now the black spots on walnut leaves, as well as "walnut charcoal-gangrene", are fungal diseases. Spray tetramycin (also known as uninamycin), add thiophanate-methyl, mix spraying, pay attention to the back and front of the leaf should be sprayed.

After spraying for 7-10 days, spray carefully with Bordeaux liquid, in the same way as above, be sure to be uniform and careful.

The picture above is melanoma;

The picture below is anthracnose.

[Harmful characteristics]: Walnut black spot disease symptoms Walnut black spot disease is also known as black rot. It is mainly harmful to young fruits and leaves, and can also be harmful to young branches.

The young fruit is infected, and the fruit surface has small brown spots, the edge is not obvious, and then it turns black and deep to the pulp, causing the whole walnut and kernel to turn black or rot and fall off. After the near-ripe fruit is infected, it is first confined to the exocarp, and then spreads to the mesocarp, causing the diseased part of the peel to fall off, the endocarp is exposed, and the kernel is intact. Leaf infection, first on the leaf veins appear nearly round or polygonal small brown spots, expand and heal with each other, the periphery of the lesion is water-stained halo, a few perforations in the later stage, the diseased leaves shrink and deform.

Pathogen]: Xanthomonas Campestris Pierce Dye Synonyms: Xanthomonas Juglandis (Pierce) Dowson...

Called Xanthomonas genus, the brillaria nigra rot xanthomonas walnut black spot to the disease type, is a bacterium. The thallus is short rod-shaped, microns in size, terminal 1 flagella, cultivated in the blue sky line of the bevel plane of beef juice glucose agar, the colony is protruding, the growth is vigorous, smooth and opaque with luster, light lemon yellow, sticky, the growth temperature is 28 32, the highest is 37, the lowest is 5, 53 55 10 minutes lethal, adaptation, pH 6 8 is optimal.

Pathogenesis ]: Pathogenic bacteria overwinter in branches or buds. In the following spring, the bacterial fluid is transmitted by wind and rain, and invades from stomata, skin pores, nectar glands and wounds, causing infection of leaves, fruits or shoots.

Under 4 30 conditions, the host epidermis is moist and pathogens can invade leaves or fruits. The incubation period is 5 to 34 days, and in the field it is mostly 10 to 15 days. Walnut flower stage and susceptible to disease, rainy summer disease is serious.

Wounds caused by walnut limb moths are susceptible to infection by the fungus.

Control methods] :(1) timely control of walnut pests. (2) Spraying 4000 times of Bordeaux solution or 72% agricultural streptomycin soluble powder and 400,000 units of penicillin potassium salt are also effective for diluting water into 5000 times when walnut leaves are spreading and after flowering.