How to treat black spots on the leaves of poplar seedlings?

It should be anthrax. The affected leaves initially appeared with small water-stained spots on the back of the leaves, then black spots appeared, and gradually expanded into irregular black spots, which expanded rapidly along the veins and leaf margins. The lesions on the branches are black at first, then yellowish-brown, and grayish-white over time, with a clear boundary between the color of the edges and healthy tissues.

Leaves wither, early shedding, dry branches, distorted stems, affect the growth of trees, and even cause seedlings and young trees to die.

Prevention and control methods First, avoid planting the heavily susceptible poplar near other hosts of the anthrax fungus to reduce cross-infection. Second, combine pruning, shaping, and pruning off diseased shoots, and concentrate on burning to reduce the initial infection**. The third is spraying, when you buy medicine, people will tell you what to spray and how to spray.

The black spots on the poplar seedlings may be infected with black spot disease, also known as brown spot disease, black spot disease, black seedling disease, etc., which is a disease that is more harmful to poplars. Poplar black spot disease mainly affects leaves. In the north, the general excavation period of the disease, first of all, the back of the leaf of the damaged plant appears small black spots, gradually form black spots, in the rainy season the black spots are connected with each other, quickly turn black and dry and fall off, the seriously damaged plants, the whole plant forms a light rod, and the tips are dry.

The leaflets and seedling stems are all black and dead, and the seedling stems are twisted and not straight. The main prevention and control measures of poplar black spot disease are: reasonable dense planting, strengthen management, the implementation of large ridge sowing, strip sowing or cuttings, when the density is too large, appropriate sound seedlings or remove 3-5 bottom leaves, pay close attention to observation, and find that the diseased plants can be removed in time to reduce the occurrence of diseases.

Pesticide control is generally sprayed to seedlings in late June, and 500 times of 65 dyceen zinc or 1:125 170 Bordeaux solution can be sprayed once every half month, a total of 3-4 times.

Black dots on the leaves of poplar seedlings. It is usually caused by a fungal infection, which can be improved by spraying with carbendazim.

My poplar tree has black spots, what is the disease and how to prevent it.

It is gray spot black spot type and is the mold case in the case of heavy rain or moderate heavy occurrence and occurs mostly from the tip of a leaf and the edge. I will copy the control method: poplar black spot disease is mainly harmful to leaves and petioles, and severe disease ground source tolerance block can make poplar fall 1-2 months early.

Some poplar slag trees form canker spots on the treetops, and dead shoots are severely formed. Seedling susceptibility affects the growth of seedlings, and the body of susceptible trees in forest trees is weakened, and other diseases are easy to appear on trees if they are susceptible to disease for several consecutive years. Such as canker, wood rot, etc.

Prevention and control of poplar black spot disease first of all to breed excellent disease-resistant tree species, increase the application of bio-type organic and inorganic compound fertilizer when raising seedlings, the selected woodland should be well drained, no water accumulation in the rainy season, seedling field, early spring, mid-June, late July, respectively, with 70% mancozeb 600 times plus 20% well gangmycin 2000 times, plus 1000 times a day up to 2116 spray, can prevent poplar black spot disease, poplar trees, because of the high spraying difficulty of the tree, can use the root irrigation method. In mid-June, mid-July and mid-August every year, the roots are watered with 96% chlormycofen 4000 times plus 1500 times Tianda 2116 mixed hail beam spring compound solution, and each tree is watered with 10-20 kg of medicinal solution. (You can also water more diseased trees, but no diseased trees).

If you want to prevent black spots on the trunk of poplar seedlings, you can give them sufficient light, water and fertilizer during the growth period to improve the disease resistance of poplar seedlings. Later maintenance, regular spraying of poplar seedlings, can prevent pests and diseases. If you want to suppress black spot disease, you can prune the diseased leaves and spray them with chlorothalonil or carbendazim.

During the growth period of poplar seedlings, black spots appear on the leaves, which may be black spot disease. In order to suppress black spot disease, it is necessary to cut off the diseased leaves and burn them intensively to cut off the source of infection. After pruning, poplar seedlings can be sprayed with pesticides such as chlorothalonil, carbendazim or methyl tobuzin, which can be sprayed once in 7 10 days, and 3 or 4 times in a row are required.

After poplar seedlings recover in the later stage, it is necessary to strengthen management if they want to prevent black spot disease. During the growth period, poplar seedlings are given sufficient light, water and fertilizer to promote the normal growth of poplar seedlings. Sufficient light, water and fertilizer can make poplar seedlings grow better, and during the growth period, it can improve the disease resistance of poplar seedlings.

To prevent poplar seedlings from getting disease, they need to be sprayed regularly during their growth. During the maintenance period, generally between 20 and 30 days, poplar seedlings can be sprayed with carbendazim or chlorothalonil once. Regular spraying of poplar seedlings can effectively prevent diseases and prevent aphids and red spiders from invading poplar seedlings.

During the growth period of poplar seedlings, it is necessary to strengthen management and carry out reasonable maintenance according to their growth habits. Poplar saplings love light and are not tolerant to strong light, so during the summer, they need to do a good job of shading to avoid poplar saplings being burned by the scorching sun. Poplar saplings are not tolerant to waterlogging during their growth and need the right amount of watering to enable them to grow normally.

Summary. Hello, it may be poplar black spot, which is a fungal disease that is commonly found in moist and rainy environments, especially in spring and summer. To prevent the spread of the disease, it is advisable to immediately cut off infected branches and leaves and clean up the surrounding fallen leaves and weeds to increase air circulation.

A range of measures, such as the use of lime sulphur fumigation and spraying, may also help prevent the disease from progressing. It is best to bring in a professional to ensure effectiveness.

My poplar tree has black spots, what is the disease and how to prevent it.

Hello, it may be poplar black spot, which is a fungal disease that is commonly found in moist and rainy environments, especially in spring and summer. In order to prevent the spread of hunger, it is recommended to immediately cut off the infected branches and leaves, and clean up the surrounding fallen leaves and weeds to increase air circulation. A series of measures such as the use of lime mountain sulphur fumigation and spraying of pesticides may also help to prevent the disease from progressing further.

It is best to bring in a professional to ensure effectiveness.

The specific prevention and control methods are as follows:1Remove the yellowed leaves and branches of the infected Mengchaitan to prevent the spread of the disease.

2.Adopt prevention and control measures. Spraying can be done with a special amencide, especially when poplars are fresh leaves, to prevent the spread of the disease.

A professional botanist will recommend the most suitable fungicide and usage for the prevention and treatment of black spot disease. 3.Strengthen the management of poplars.

Healthy and strong trees may withstand and withstand the effects of disease, so care should be taken to provide poplars with adequate water, fertilizer, and a good environment for growth. 4.Prune those branches that are already infected.

This is the most thorough way to control black spot disease, but if the branches are cut widely, it may affect the overall health of the poplar.

The specific prevention and control methods are as follows:1Remove infected yellow leaves and branches to prevent the spread of the disease.

2.Adopt prevention and control measures. Spraying can be carried out with a special fungicide, especially when poplars are newly growing leaves, which can prevent the spread of the disease.

A professional botanist will recommend fungicides and usage for the prevention and treatment of black spot disease. 3.Strengthen the management of poplars.

Healthy and strong trees may withstand and withstand the effects of disease, so care should be taken to provide poplars with adequate water, fertilizer, and a good environment for growth. 4.Prune those branches that are already infected.

This is the most thorough way to control black spot disease, but if the branches are cut widely, it may affect the overall health of the poplar tree.

Summary. Poplar black spot disease, also known as poplar brown spot disease, the disease fungus can infect a variety of poplars, seedlings, young trees, and large trees can be susceptible, affecting the normal growth of trees when the disease is serious, causing economic losses. Symptoms of poplar black spot disease:

It generally occurs on the tender shoots of leaves and fruit spikes, spreads from top to bottom, and mainly harms leaves.

My poplar tree has black spots, what is the disease and how to prevent it.

Poplar black spot disease, also known as poplar brown spot disease, the disease fungus can infect a variety of poplars, seedlings, young trees, large trees can be susceptible, serious disease affects the normal growth of trees, spring and economic losses. Symptoms of black spot disease in Yang Chun shouted trees: It generally occurs on the tender tips of the leaves and fruit spikes, and spreads from top to bottom, mainly harming the leaves.

Strengthen nursery management. Disease-resistant varieties should be selected to raise seedlings, pay attention to the key delay and time seedlings, improve ventilation and light transmission conditions, do a good job in field management such as drainage, reduce the disease conditions of manuscript liquid plums, nursery land should avoid continuous cropping or avoid setting the nursery near the susceptible plants, can be planned to change the seedlings, the seeds with bacteria need to be buried tung chemical treatment, to prevent the onset of seedlings, can be used 85% chlorothalonil wettable powder 1000 1500 times liquid or with methyl tobuzin and multiguodine powder spraying treatment of dry seeds.

Reasonable dense planting and time felling to keep the forest ventilated and light-transmitting. Timely removal of leaf litter in the forest to reduce the closure of the source of disease. During the onset of the disease, nurseries and forests with 200 times Bordeaux solution or 85% mancozeb 250 times liquid spraying, chain destruction rainy season spraying, the potion should be added to the shed gelatin (or soybean flour juice, soybean milk), to prevent being washed off by water, and should be cleaned at any time to deal with diseased leaves, fallen leaves, eliminate pathogenic bacteria, can also be sprayed in early June 40% carbendazim 800 times solution, or 25% chlorothalonil 600 to 800 times solution, or urea and potassium dihydrogen phosphate mixture for prevention.

My poplar tree has black spots, what is the disease and how to prevent it.

Hello, the reason for the appearance of black spots in poplars may be disease or blight, usually due to the attack of the leaves by pathogens, and the leaves are known to have black spots or black spots. In view of this situation, it is recommended that you take corresponding measures to prevent and control it in time: 1. Timely fertilization:

Organic fertilizer or urea should be applied in time, and at the same time, it can be combined with plant disease resistance to enhance immunity; 2. Spraying control: foliar spraying to eliminate diseases on the foliage; 3. Timely treatment of the damage caused by Ye Bishen tablets: the leaves with excessive damage should be removed in time; 4. Pay more attention:

Regularly inspect the state of poplar trees, and deal with diseases in a timely manner.

The prevention and control of poplar purple root disease can be started from the aspects of seedlings, planting site selection, and management. Seedling Wuyu pure wood screening: when purchasing seedlings, it is necessary to pay attention to it, strengthen disease detection, do not transfer seedlings from low-lying nurseries, and do not choose seedlings with dull root epidermis, sparse fibrous roots, and poor seedling growth.

Selection or treatment of planting plots: For low-lying afforestation plots, it is best to use ferrous sulfate, carbendazim, and quicklime for disinfection treatment before afforestation. Prevention and treatment after the onset of the disease:

When the seedlings appear yellow and the root zone is brown, it is necessary to take ferrous sulfate, carbendazim and quicklime dilution to irrigate the roots, which can effectively control and inhibit the development and spread of pathogens.