What pests and diseases should be prevented after eucalyptus planting for one year, and how to deal

In recent years, eucalyptus.

The area of fungal diseases such as shoot blight has increased year by year, and has become the focus of eucalyptus pest control.

There are certain rules to follow in the onset of eucalyptus tree blight

It is easy to occur in areas with high humidity, such as gullies, reservoirs, ponds, and rivers at the foot of mountains.

Areas with poor ventilation conditions such as mountain nests and foot of mountains are prone to occur;

In the early stage, the main occurrence area was below the middle of the mountain, and the disease rarely occurred on the top of the mountain. In the later stage, the disease occurred in the whole mountain.

In the early stage of the disease: the edge of the leaf is yellow, the leaf has yellow spots, and there are yellow fungal spores on the back of the leaf.

Middle stage of the disease: With the aggravation of the symptoms of eucalyptus leaf spot, the branches and shoots begin to secrete gelatin, the epidermis of the young shoots appears colloidal crusting, the conduction tissue is affected, and the tender shoots begin to appear dehydrated and dry after the symptoms are aggravated.

Later stage of the disease: with the aggravation of the symptoms of dry shoots, the conduction system of eucalyptus is further damaged, the symptoms of leaf spots are aggravated, the leaves turn yellow further and begin to fall off, the dry shoots and young shoots are aggravated, the phenomenon of top shoots and whole branches die, the growth of eucalyptus is hindered, and finally, the whole leaves fall off, the branches dry up, and the growth is basically stagnant.

Prevention and control recommendations. 1. Eucalyptus treetip blight is a fungal disease, and fungal fungicides should be used for prevention and control;

2. Fungicides are divided into protective agents and first-class agents, and the early protective agents have a certain prevention and control effect, and the first-class agents should be selected after the aggravation of the disease in the later stage, and can be supplemented with antibiotics and strengthen fertilizer and water management.

Protective fungicides: methylcarbendazim, methylcarbendazim.

carbendazim, azoxystrobin, pyraclostrobin.

Wait; **Fungicide: difenoconazole.

Wait; Antibiotics: polyantimycin, etc.

3. Technical essentials of powder spraying prevention and control:

Pre-spraying (3-5 months) should be carried out in the early stage of the disease, focusing on the prevention and control of mountain nests, gullies, ponds and other prone areas, protective agents, ** agents have a certain prevention and control effect. Prevention and control methods: young forests can be sprayed, mature forests can be sprayed with powder, and spraying should be sprayed before 9 o'clock in the morning.

Medium-term spraying (6-7 months) due to the large area of the disease area, it is advisable to spray from the foot of the mountain upwards, the foot of the mountain should be sprayed heavily, the top of the mountain can be appropriately reduced the amount of spraying, the agent should be selected ** agent, at this time the protective agent prevention and control effect is greatly weakened.

Later spraying (8-9 months) because the branches and leaves have been seriously damaged, the recovery period after the control is longer, the tree body is weak, you can consider top dressing after October, the control agent should be selected ** agent + antibiotic.

Abstract Hello, eucalyptus has insects, you can apply lime water one meter to one meter high on the body of the eucalyptus tree, and put a little lime powder and lime paste on the surface of the soil.

It can also be mixed with lime + sulfur, and it is also possible to paint trees.

Lime, sulfur, will kill bacteria, insecticide.

How to spray eucalyptus trees if they are too high.

Hello, eucalyptus trees have insects, you can apply lime water one meter to one meter high on the body of eucalyptus trees, put a little lime powder on the surface of the soil, lime paste can also be lime + sulfur mixed with water, and trees can also be lime, sulfur, sterilization, insecticide.

Eucalyptus trees are bitten by nameless insects.

Apply a little lime to kill insects.

Spraying has no effect.

Try with lime powder.

1. Disease prevention.

Scorch blight, bacterial wilt, stem rot, and gray mold are common diseases of fast-growing eucalyptus.

Scorchroid wilt is mainly manifested as gray-green water stains at the junction of healthy tissues and diseased spots, and the leaves are drying up and falling off. Bacterial wilt can occur throughout the growth cycle of fast-growing eucalyptus trees, and is characterized by some or all of the leaves wilting, drying, drooping, and dying within a few days. Stem rot is characterized by the appearance of white watery lesions at the base of the stem, which then turn brown and black.

Botrytis is characterized by the formation of fungal mold on the surface of the plant. In the prevention and control of fast-growing eucalyptus diseases, it is necessary to adhere to the principle of giving priority to prevention and combining prevention and control. First of all, it is necessary to carry out thorough disinfection during the planting process, prevent and control the germs are brought in with the seedlings, and also maintain the normal drainage system in the planting area to cut off the transmission route of germs.

Attention should also be paid to rational fertilization. In addition, you can also choose Bordeaux liquid, chlorothalonil, methyl tobuzin and other chemical agents for sterilization.

2. Pest control.

Soil-dwelling termites are a common insect pest of fast-growing eucalyptus trees, usually occurring in the young forest stage, where termites first damage the rhizomes of young plants, then turn to the surface and aboveground, and strip the taproot and root along the topsoil, eventually causing the seedlings to die because they cannot deliver nutrients. The prevention and control of ant pests should be based on prevention, and bait should be trapped. In afforestation, 3 4g of carbofuran can be placed in the hole, mixed with soil base fertilizer to fill the hole, and the drug can be used every 667 m 2.

After afforestation, 2g of carbofuran can be placed at a distance of 5m from the tree pocket, and the medicine should be used every 667mz, and attention should be paid to avoid the pesticide damage caused by the powder touching the saplings. Fast-growing eucalyptus is one of the fastest growing tree species in the world, reasonable cultivation technology is of great significance to improve eucalyptus yield, every link of fast-growing eucalyptus planting and management will affect its final yield, the use of scientific planting technology, and strengthen the prevention and control of pests and diseases, will be able to achieve the purpose of rapid increase in yield.

3. Weed-proofing.

After manually laying a black film with a thickness of 5 wires and 1 m2, the edges around it are pressed with soil, and the wind cannot be blown away. Or use thinner agricultural film (1 1 or, it is recommended to use meter-wide agricultural film to lay in a strip to save labor and time. It is estimated that

The cost of 1 m2 black film (non-degradable) per plant is RMB; The use of agricultural mulch film (degradable) is the first element of each plant, and the life span can generally reach 10 to 12 months. The use of agricultural mulch film does not need to be weeded within one year within the scope of use, and has a good effect of heat preservation, water retention and insect control.

Commonly used insecticides are dimethoate, pyrethroids, chlorpyramide, pyrethraurea, nicotine, imidacloprid, and underground pests can be used in Lesben.

Commonly used fungicides are carbendazim, zebze, methyl tobuzin, formabi, fenanin, Ruixin, Xiansheng, etc.