What kind of medicine is generally used for black pine pests and diseases?

Pesticide pests and diseases were selected in time to control P. nigra, and P. nigra had strong resistance to pests and diseases, and its resistance to pine scales and pine caterpillars was better than that of Pinus saturatis and Pinus tabuliformis. The main diseases are pine seedling cataplexy, and the seedbed is watered with 4 to 6 grams of square meters of 75% Dixon; Pine seedling leaf blight was sprayed with 40% carbendazim 800 times solution or 40% methyl tobuzin 800 times solution. The main insect pests are Japanese pine scales, which are controlled with 3 to 5 times 50% monocrotophos EC or 40% dimethoate; Pine caterpillars can be killed by spraying 1000 to 1500 times with 50% dichlorvos emulsion.

1. Pine rot disease

It mainly damages the central stem and the lower cortex of the main branch. The diseased part is reddish-brown, slightly raised, water-stained, and the posterior cortex is rotten, often flowing yellow-brown juice, wet rot, with the smell of sake lees, the lesions are round or oval, the edges are not clear, and sometimes they are dark and shallow.

Control methods: strengthen cultivation management; cleaning the orchard; Pharmaceutical prevention and control: scrape the diseased skin, apply 1 2 times fungicide, the agent can be 40 Fumei arsenic, antibacterial special, stone sulfur mixture, 843** agent, rotten spirit, etc.

2. Pine trunk rot

It is an important disease of apple branches, mainly harmful branches. The lesions are oval or unshaped, dark brown at first, and gradually expand into concave banded stripes, tens of centimeters long, black-brown. The boundary between the sick and the healthy is often cracked, and the skin is upturned.

There are many small black dots that protrude from the affected area, which break through the epidermis when they mature. The control method is the same as the apple rot disease prevention and control method.

3. Powdery mildew in pine trees

It is mainly harmful to new shoots and young leaves, and can also harm flowers and young fruits. After the new shoots are damaged, the internodes are shortened, the leaves are slender, the leaf margins are rolled up, the texture is hard and brittle, the damaged part is covered with a layer of white powder, and the later stage becomes yellow-brown, and the whole shoot dies in severe cases.

Prevention and control methods: (1) Eliminate pathogens. (2) Strengthen cultivation management. (3) Pharmaceutical prevention and control, mainly including methyl tobuzin, carbendazim, benzelide, formosine, etc.

4. Pine ring disease

The disease is a very serious disease of the tree. It mainly damages branches and fruits, and leaf damage is rare. The branches are damaged, centered on the skin pores, forming a reddish-brown lesion with a straight longitude of 3 20 meters.

The central protrusion of the lesion is pathological, and the edges are cracked. It makes the skin look very rough. The damage to the fruit is also centered on the skin pores, generating water-stained brown rot spots, which soon expand to the surroundings in the form of concentric rings, and the whole fruit can rot in 5 to 6 days.

The lesions are not sunken, the diseased tissues are soft and rotten, and often emit a sour odor.

Control methods: strengthen cultivation management; Spray protection. Commonly used agents are carbendazim, methyl tobuzin, mancozeb, Bordeaux liquid and so on.

How to grow pine trees:

1. Soil. Choose sandy loam soils with loose soil and deep layers of soil, and choose to plant on flat terrain. Because sand piles need to be used, you can choose a house with clean doors and windows in good condition for comprehensive disinfection, and put the pure sand that has been disinfected and the humidity is about 60% indoors, and pay attention to ventilation, moisturization and anti-freezing. The following year, when the seeds have a 40% to 50% split, they can be planted.

2. Seedling management.

25 days after sowing 30 days after the seedlings with shells unearthed, about 15 days the shell fell off on its own, this period to prevent birds and beasts from destroying. The main pests and diseases encountered by pine trees are blight, which can be sprayed with common pesticides such as carbendazim. It is important to pay attention to the timely watering of the soil to keep it in a good growing environment.

3. Precautions for planting.

Pine trees grow slowly, so transplants are arranged according to the growth situation. Generally, the seedlings are transplanted for the first time in 1 year and 2 years, and then cultivated in 1 year and 2 years in the mountains for afforestation. The 5-year-old seedlings were transplanted for the second time, and the 8-year-old and 10-year-old seedlings were transplanted for the third time.

After the third transplant, it can be applied to landscaping.

Pine caterpillars are the main leaf-eating pests of pine trees, often causing great losses. Matsutake needle moth mainly harms Pinus massoniana and Pinus tabuliformis, and is often mixed with Pinus machinensis caterpillars in Guangxi, which can be rampant. The larvae of pine needle moths and marsupial moths are also seriously affected.

The new pine wasp is intermittently infested in different distribution ranges. The reddish spotted borer is almost all over the country and is the most important pest of the main shoot, causing the side branches to clump or bend the trunk due to the replacement of the main tip.

Huashan pine beetles infringe on health, and can be rampant. The pine twelve-toothed beetle, larch eight-toothed beetle and spruce eight-toothed beetle can also attack healthy wood. The pine scale is a devastating pest that sucks and sucks branches.

In the prevention and control, the principles of afforestation measures such as suitable trees in the right place, reasonable mixing, and good tending management should be implemented, and they can be supplemented with pesticides when necessary.

Resistant to negative:

The vast majority of pine trees prefer light, and their appearance is reflected in the sparse distribution of the canopy and the strong ability of natural pruning, so in terms of physiology, their compensation points will not be the same as those of other tree species.

In the process of forestation, pioneer tree species are usually formed, and once the primeval forest is damaged by external forces, the pioneer tree species will develop rapidly and replace the original tree species, but its own stability is not ideal.

If pine trees are able to form a specific environment, they will be replaced by species with strong negative tolerance and longevity, and eventually lose their unique advantages. For pine species, most of the tree species can be substituted for each other, especially the ideal species for negative tolerance, which has significant advantages.

Common diseases are coal stain disease, leaf spot disease, can be used 0 5% 1% Bordeaux liquid, one month before the rainy season, every 10 days sprayed l times, 3 times in a row, can play a prevention and control effect. The main insect pests are the big moth, red wax scale insect, red spider, etc., which can be sprayed with dichlorvos 1200 1500 times liquid, and can also be sprayed with 40% dimethoate 1500 times liquid.

The most common and serious occurrence at the seedling stage is cataplexy, which has symptoms such as seed rot before unearthing, as well as top rot, standing withering, and cataplexy after unearthing. Pine seedling leaf blight at the seedling stage of Masson pine is sometimes a serious damage. Common leaf diseases include pine needle rust, pine needle drop and Masson pine blight.

The latter two mostly occur in stands with poor sites, poor soils, and poor growth. Cadre diseases include blister rust and five-needle pine blistering rust, which are important forest diseases in the world, and a large number of five-needle pine forests have been destroyed in Europe and North America; Young Korean pine plantations in northeastern China have also been severely damaged. Pinus massoniana and Pinus huangshan had pine rust in the stands of Wofeng, high humidity and many oak trees. White rot is also common.

1) The appearance of pine trees was normal, the resin secretion was reduced, the transpiration was reduced, and the traces of pine brown beetle on the bark were often seen on the young branches.

The needles begin to change color, the secretion of resin stops, and in addition to the traces of nutritional supplementation of the pine brown beetle, egg-laying grooves can also be found;

Most of the needles are yellowish-brown and wilted, and the decay of the pine brown beetle can be seen;

The needles all turn yellowish-brown to reddish-brown, and the diseased trees dry up and die. Control methods, manual felling of diseased and dead trees, to prevent the spread of the species or longhorn beetle carried by wood in the epidemic area, bag fumigation to kill the pine black beetle, the use of natural enemies Guan's swollen-legged wasps, to prevent and control the longhorn bee.

First of all, we should pay attention to the selection and treatment of tree species, because if we can choose healthy and high-quality pine trees to collect tree species, we can promote the healthy growth and development of pine trees to a certain extent, provide a good growth environment for pine trees, and improve the disease resistance of pine trees. We usually choose to collect the tree species in August and October every year, and when the tree species is collected, we need to store the tree seeds in a dry and ventilated room and disinfect them in time.

In the process of growth and development of pine trees, the most common pests and diseases are powdery mildew and ring disease. If the edges of the pine leaves begin to roll upwards and the affected parts are covered with a layer of powdery powder, which gradually turns yellowish-brown, then the pine tree is likely to be infected with powdery mildew. How can we prevent it?

First of all, we need to eliminate pathogens and strengthen the cultivation and management of pine trees. If the condition of the pine tree is more severe, we can spray methyl tobuzine solution evenly on the branches of the pine tree.

As pine trees grow and develop, they may also be infected with a very serious disease called ring disease. Ring disease usually appears on the branches and fruits of pine trees, but generally not on the leaves of pine trees. When a pine tree is infected with ring-streak disease, a reddish-brown lesion with a diameter of about 3 20 cm will appear on its branch.

The central part of the lesion protrudes outward, and the edges crack outward, giving the pine branch skin a very rough look. So how should we solve it? We can first scrape off the diseased bark, and then apply fungicide 1 or 2 times to the trunk, and the agent can choose stone sulfur mixture and rotten spirit.

If we observe the appearance of nectar droplets and loose spots on the branches of the pine tree, the spots will gradually join together and then form a harder black mold layer. Then the pine tree is likely to be infected with coal stain disease. Pine trees can develop very serious symptoms after being infected with this disease, so we need to deal with them in a timely manner.

First of all, we need to prune the branches and leaves of the pine tree properly to achieve the effect of ventilation and light. Secondly, if the condition of the pine tree is more severe, we can spray the branches with a total of Baumé stone sulfur.

Summary: For pine trees in the process of growth and development, there are likely or have occurred pests and diseases, we must adhere to the principle of prevention and combination. In order to improve the disease resistance of pine trees, first of all, we need to choose tree species with strong insect resistance to achieve the effect of preventing pests and diseases.

Secondly, we should combine scientific water and fertilizer management to continuously enhance the tree strength of pine trees. In autumn and winter, when the temperature is relatively low, we need to remove and burn the eggs on the branches in time to reduce the possibility of pine trees being infected with pests and diseases.

The causative agent of pine defoliation disease is loose spot fungus and Japanese larch cococcus.

Symptoms: Coniferous disease begins with pale green spots, which soon appear as bright yellow spots and then develop into patches. Pale black-brown horizontal lines are formed between the spots, causing the pine needles to turn yellow and fall off.

Occurrence pattern: The fungus usually attacks the 2-year-old needles, and it occurs once a year. That is, the germs spend the winter in the sick needles that fall off to the ground, and symptoms appear from June to July.

From April to May, when the humidity is high, it is suitable for spores to scatter and germinate, which is conducive to the occurrence and epidemic of the disease. When there is too much drought and water shortage, the disease resistance of forest trees is reduced, and it is easy to get sick. Weak plants transplanted that year are also susceptible to disease; In the same woodland, where weeds are overgrown, the disease center (or central diseased plant) is often formed, and the pathogen is easy to spread to the surrounding plants.

Prevention and control methods: clean up dead branches and leaves, and clean up dead trees immediately; Regularly spray tebuconazole, carbendazim and pyraclostrobin for prevention, and take medication once every half a month during the prone period.

Pine tree blight disease.

Symptoms: Due to the complexity of the disease of pine and blight, the symptoms are diverse. According to the reports on pine wilt disease at home and abroad, the main symptoms are as follows: terminal bud dead type, needle blight, blight shoot type, arbuscular branch type, wilt type (dry type).

Occurrence pattern: Pathogen spores can germinate on the surface of needles and invade the host from the stomata. It can also be invaded from a superficial wound.

The spores are spread by rain, and if there is rain that lasts for more than 2 hours during the pine shoot extraction period, the spores will be released, spread and infected in large quantities. Pathogens only deteriorate the ecological environment, and when the growth of trees declines, pathogen infection causes blight disease. That is, predisposing factors (climate discomfort, soil moisture imbalance, soil poor and air pollution, etc.), aggravating factors (leaf-eating pests, frost damage, drought and mechanical damage, etc.), and promoting factors (dry boring pests, canker bacteria, viruses, etc.).

Prevention and control methods: the prevention and control of larch blight disease should start from seedlings and young trees, and it is clear that seedlings and young trees are the main forest ages of larch disease, and tebuconazole carbendazim and pyraclostrobin can be sprayed once every half month. The diseased young trees should be pruned and diseased shoots should be pruned and destroyed, so as to prevent and control the spread of the source of the disease.

Larch blight disease mostly occurs in places that are windy or susceptible to wind damage, so transplanting should be avoided at this time; Breed good tree species and create mixed forests, such as larch and broadleaf or other coniferous forests; After the disease, the plant can be pruned with diseased branches, dead branches, and the whole plant can be sprayed with tebuconazole carbendazim once a week.

Beauveria bassiana can be used to control Beauveria bassiana, which can effectively control Masson pine caterpillars, and is best used during periods of mild weather.

Types of Diseases The main disease that can occur in this pine tree is branch blight, which is a parasitic pathogen with relatively high parasitic ability. They are basically lurking inside the tree, but if the rain is normal, the germs will not attack the tree. But when there is too much rain, too little rain or too cold weather, the health of the tree itself will decline.

That's when the bacteria can damage the black pine. But don't underestimate this disease, if it is serious, it can completely kill the whole tree.

Disease prevention and control Therefore, it is very important to prevent and treat this disease. First of all, it is necessary to strengthen management, the amount of fertilizer should be sufficient, and the location of fertilization can be selected around the tree. But you should also keep a certain distance from the trunk, about one meter.

If there are seriously diseased trees around, you should immediately remove the valve directly. Trees that are not severely affected can choose to remove the dead branches and leaves that they have already suffered, as well as the surrounding grass. Moreover, it is necessary to concentrate on destroying these diseased branches.

In addition, there are also branches that grow too densely, which will block the sunlight that the branches can come into contact with, so that the branches that are too dense should be left and the weak ones should be removed directly.

Insect pests There are many insect pests that this tree is susceptible to, such as pine borer, pine caterpillar, etc. Among them, the feathering of the pine borer is generally around 11 a.m., and if it appears on the young plant, it may directly lead to the death of the young plant.

Pest control Usually observe more, and if you find a pest, you should treat it immediately. Because even the discovery can reduce the wound and avoid the appearance of disease. The best treatment period is when the overwintering adults appear, and a certain dose of pine borer EC can be used.

If you don't want to use a potion, you can also use other methods to trap them.