What are the pests and diseases of holly trees, common pests and diseases of holly and their control

Common pests and diseases of holly and how to control them:

A common disease of holly

Leaf spot disease

Symptoms:

Holly leaves appear gray-brown lesions, mostly round or oval, and gray-white mold layer appears on the surface of the diseased part when the humidity is high.

The prevention and control measures are as follows:

Remove and burn diseased leaves in time to reduce the source of infection; soil application of oak leaves or cottonseed meal; The plants are sprayed with Bordeaux sap.

For the prevention and control of copper preparations or fungicides such as Fumei iron, it can be sprayed with 600 times of 75% chlorothalonil wettable powder.

Twig blight

The disease causes the epidermis of holly branches to turn brown, large leaves to wither and fall off, and the plant dies because the plant is unable to obtain nutrients. The symptoms of the disease are very similar to those of the plant due to water loss and death, so it is necessary to pay attention to the distinction and detect the disease in time. And once the symptoms appear, they are often more serious, and it is relatively difficult to prevent and treat, so prevention is generally the main thing.

The prevention and control methods are as follows:

Immediately after pruning, spray 800 times of Xinzi wettable powder and 1000 times of amidinechloraz to protect it from the invasion of germs;

Spray a fungicidal agent 600 times sterile liquid or Xinziqing wettable powder 600 times liquid spray every 10 days, and spray three times in a row.

Root rot

10% antibacterial agent 401 acetic acid can be sprayed 1000 times of the solution.

Holly is a common insect infestation

For the prevention of insect pests, it is first necessary to choose healthy wintergreen seedlings for planting, the planting density should be appropriate, pay attention to aeration, etc.

ForAphids, leafhoppers andScale insects, can be sprayed with 50% pine moth emulsifiable concentrate 1000 times. happensSpider mitesWhen harmful, it can be sprayed with 1000 times of 20% dicofol sulfone wettable powder.

In addition,The common damage of the round shield scale is that the leaves appear to be punctate yellowing at the beginning of the damage, and the whole yellowing is severe and then die. It can be sprayed with 2000 times of 48% Wanling powder.

1. The main diseases and treatment of holly.

The common diseases of holly are leaf spot, branch blight, root rot, anthracnose, etc., and the specific method should determine the specific type of disease according to the disease in order to take targeted measures to prescribe the right medicine.

Leaf spot disease is one of the important diseases of plants, which is widely distributed in China and occurs everywhere. It is divided into three types at the time of its onset, namely cockscomb mosaic leaf spot (also known as brown spot), fishtail sunflower leaf spot (also known as black spot), and junzi orchid leaf spot (blight), which generally occurs on holly is brown spot. The specific symptoms are that the lesions on the leaves are round, and then expand into irregular large lesions, and produce ring stripes, and the lesions change from reddish-brown to black-brown, **gray-brown.

The main drug** method is 20% silazole prochloraz 1000 times liquid, 38% oxazine copper strobin 800-1000 times liquid or 4% flusilazole 1000 times liquid, 50% tobuzine 1000 times and other agents for spraying.

Bend disease causes the epidermis of holly to appear abnormally brown, accompanied by the withering and falling of large leaves, which hinders the plant's access to nutrients and eventually causes the plant to die. The symptoms of the disease are very similar to those of plants due to water loss and death, and it is necessary to diagnose and take measures in time when symptoms appear. The common drug** method is to spray 800 times of Xinzi wettable powder, or 1000 times of amidinechloraz after pruning, and then spray 600 times of fungicidal agent fungus sterile solution or 600 times of Xinziqing wettable powder every 10 days, and spray it three times in a row.

Root rot is a fungal disease that causes root rot, weakens the plant's ability to absorb water and nutrients, and eventually dies of the whole plant, similar to branch blight. In the early stage of the disease, there are no symptoms, and after exacerbation, new leaves will turn yellow, and the upper leaves will wilt when evaporation is strong, but they can recover at night. The common method of agent** is to spray 10% antibacterial agent 401 acetic acid to dissolve 1000 times of the solution, or use methyl frost mildew or copper preparation for root irrigation.

Anthrax is caused by a fungus, and the leaves or branches are spotted, and the lesions often have small black spots arranged in a wheel-like pattern that break through the epidermis of the diseased area. Severely affected leaves often have multiple lesions, causing leaf stems to wilt. The common method is to spray 800 times of 80% anthrax Fumei wettable powder, 600 times of 50% Fumei double wettable powder, or 800 times of 75% chlorothalonil wettable powder every 7 to 10 days, and spray 2 to 3 times in a row.

The above is the main disease of holly and the best method, when planting holly, we must pay more attention to observation, and determine the cause in time when the abnormal phenomenon of holly is found, and carry out the disease as soon as possible.

Answer: What are the pests and diseases of holly trees, in the spring holly trees have insects, there are caterpillars, spray to kill the insects, this is no insect pests.

A common disease of holly

Leaf spot diseaseSymptoms manifest as grayish-brown spots on the leaves of holly, mostly round or oval. When the humidity is high, the surface of the affected area is covered with grayish-white mold spots.

The prevention and control measures are: remove the diseased leaves in time and burn them to reduce the source of infection; apply oak leaves or cottonseed meal to the soil; Plants can be sprayed with copper preparations such as Bordeaux liquid or fungicides such as formosis, and 600 times the 75% chlorothalonil wettable powder can be sprayed.

Twig blightThis disease causes the branches of holly to turn yellow, the leaves to wither and fall off in large quantities, and the plants die due to lack of nutrients. The symptoms of the disease are very similar to those of plants that die after dehydration, and it is necessary to pay attention to the hidden and closed intentions to distinguish and detect the disease in time.

And once symptoms appear, they are often severe and relatively difficult to prevent. Prevention is generally the main focus. The specific prevention and control methods are:

Immediately after pruning, spray 800 times of Xinzi wettable powder and 1000 times of amidine to protect against germs from invading the wound; Spray 3 times every 10 days with a sterile solution of biocide 600 times or a new purple 600 times wettable powder.

Root rotIt can be sprayed with a 10% antibacterial agent 401 acetic acid solution that dissolves 1000 times.

Holly is a common insect infestation

For the prevention of insect foci without cracking, it is first necessary to select healthy holly seedlings for planting, with appropriate planting density and ventilation. For aphids, leafhoppers, and scale insects, 50% thiophos can be sprayed with 1000 times of thiophos EC1000 times. Spraying 20% rust would rather than wetting 1000 times to kill red spiders.

In addition, the round shield scale also has common damage, the symptoms are: in the early stage of the damage, the leaves are punctate and yellow, and in severe cases, the whole leaves turn yellow, and then die. It can be sprayed 2000 times more than 48% panacea powder.

After the holly cuttings, it is required to build a shed for shade to reduce transpiration and direct sunlight on the seedbed. When cuttings are made in early spring or late autumn, they should also be covered with film to prevent winter damage. After cuttings, it should also be watered frequently to keep the seedbed soil moist, and the soil on the surface of the seedbed should not be white.

Top dressing of cuttings can be carried out in combination with watering, and foliar spraying can also be carried out with phosphoric acid: hydrogen potassium plus urea. The weeding work should be very meticulous and do not collide with the cuttings.

French holly has strong stress resistance, few pests and diseases, and occasional stinging moths or aphids, which can be sprayed and controlled by pesticides such as dichlorgongs and imidacloprid.

Holly is propagated by cuttings, and generally takes root about 25 days after cutting, and new shoots germinate and grow about 40 days after cutting. Cultivation for 3 to 4 months, when the seedling height is 15-20 cm, it can be transplanted, and the success rate of cuttings is more than 95%.

The choice can only be made by determining the type of pest and disease.

Summary. Generally, large-leaved boxwood (commonly known as evergreen), common insect pests are boxwood, silky leaf borer, and inchworm.

It is better to control the insect pests at the initial stage or the young age of the insects, and use pyrethroid pesticides or Kangbang (Spodoptera exigua karyotype polyhedrovirus).

Holly is because of what kind of insect and what medicine is needed to kill it.

Generally, large-leaved boxwood (commonly known as evergreen), common insect pests include boxwood, silk Yuqing leaf borer, and inchworm. It is better to control the insect pest at the initial stage or the young age of the insect, and use pyrethroid pesticides to dismantle the source or Kangbang (Spodoptera exigua nuclear polyhedrovirus).

Ask about custom messages].

Generally, it is scale insects for control: use liquor mixed with water, the ratio is 1:2.

When treating insects, water the surface layer of the potting soil thoroughly. Scale insects begin to stray at room temperature 7 in spring. It can be watered once in April, and then every half a month or so, and it is effective for 4 consecutive times.

With 50 ml of vinegar (rice vinegar), put the small cotton ball into the vinegar and soak it, and gently rub it on the stems and leaves of the damaged flowers and trees with a wet cotton ball, and then wipe off the scale insects to kill. This method is convenient and safe, which can not only achieve the purpose of insect control, but also make the damaged leaves green and shiny again.

Ask about custom messages].

Although there are few large-leaved wintergreen pests and diseases, they are by no means without control. Whether it is greening or tea making, comprehensive prevention and control are advocated, emphasizing the protection of the environment. The first is to refine and prune to remove diseased and insect branches, dead branches, and over-dense branches in time.

By rationally adjusting the structure of the tree and the structure between the trees, the ventilation and light transmission conditions are improved, and the living environment of pests and diseases is deteriorated. The second is to use biotechnology to eliminate pests, use natural enemies, adopt artificial breeding, introduction and other measures to increase the population of natural enemies and control the number of pests. Third, promote the use of biological pesticides, including microbial pesticides, animal pesticides, plant pesticides, etc.

Fourth, mineral-derived pesticides can be used when necessary, such as Bordeaux liquid, stone sulfur mixture, etc. Fifth, it is forbidden to use highly toxic and high-residue pesticides, and a small amount of low-toxicity and low-residue pesticides, such as imidacloprid, can be used 20 days before tea picking. Sixth, improve the spraying technology, pay attention to timely spraying, reduce the number and concentration of pesticides, so that the treatment can be treated without specialization, can be picked and treated, if the prevention and treatment is effective, can no longer be sprayed many times.