What are these diseases? How to prevent it?

The main prevention and control methods are:

1.The main pests that harm plane trees are the star beetle, the bare-shouldered star beetle, the six-star black-spotted codling moth and the brown-edged green moth. In terms of prevention and control, manual capture or black light trapping and killing adults, egg killing, pruning insect branches, centralized treatment and other methods are mostly adopted.

2.When a large number occurs, in the occurrence period of adults and hatched larvae, the branches or canopy can be sprayed with chemical agents, 40% oxidized dimethoate EC, 50% phoxanthron EC, 90% trichlorfon crystals, 25% deltamethrin EC and other 100 500 times liquid. Use injection and hole plugging methods to control larvae that have been bored into the xylem.

3.For most longhorn beetle and codling moth larvae, it can be used: 1 50 times of dichlorvos, dimethoate, deltamethrin, etc., which are dipped in a syringe or cotton wool, are plugged into the worm holes; Plug the worm hole with aluminum phosphide sheet or zinc phosphide poison stick, and seal it with yellow mud externally, and the effect is very good.

4.Tung mildew spot is the main disease, and the prevention and control can be used to change the stubble and raise the seedlings, and it is strictly forbidden to re-stubble; In autumn, the fallen leaves of the seedlings were collected and burned to reduce the source of overwintering bacteria. In late May and July, spray 1:2:1:2 on the seedlings sown and cultivated

200 times Bordeaux liquid 2 3 times, there is a disease prevention effect, the liquid medicine should be sprayed to the back of the seedlings and leaves. <>

Symptoms of crop deficiencies and excess.

1. Symptoms present when deficient.

The growth potential of nitrogen --- is poor, the whole column is yellowed, and the leaves are pale green. The old leaves turn yellow, dry up and fall off.

Late red or purple spots appear on the lower leaves of the phosphorus --- and gangrene. The leaves are dark green.

Potassium --- old leaves are spotted (white or yellow) and the spots are gangrene in the later stages.

Calcium--- the new leaf margin is wavy, and the new leaf margin turns red and yellow.

Magnesium --- old leaves yellow, the initial stage by the mesophyll cells yellow, the leaf margin still remains green, in severe cases the yellowing part turns gangrene, decided.

The new leaves of the sulfur --- are pale yellow, the leaf shape remains unchanged, and the whole column turns yellow.

Iron --- young leaves yellow, old leaves green, pale yellow, no gangrene or necrosis.

Boron --- new leaves withered and grew one after another, and new shoots withered again; internodes shortened, petiole epidermis with transverse cracks; The epidermis is cracked and striated; Vascular bundles are torn or transversely fractured.

Zinc--- leaflets, inlay or veined margins, poor root growth, yellowing of leaves, gangrene.

Manganese --- leaves yellowing, pale green or gray-white stripes, yellowing of young leaves, and gangrene in severe cases.

The tip of the copper --- leaf withers, and the leaf bends in a cup-shape.

Molybdenum--- old leaves become lighter, yellowed, the whole plant turns yellow, and the leaves are deciduous.

2. Symptoms are present when there are too many.

The leaves of the nitrogen --- are dark green, the leaves are large and soft, with few flowers and long leaves.

Phosphorus --- can cause zinc and copper deficiency, iron deficiency, and erythema in the lower lobes.

Potassium --- can easily cause calcium and magnesium deficiency symptoms 2.

Calcium--- soil is prone to neutral or alkaline, causing deficiency of trace elements (iron, manganese, zinc), the color of the mesophyll becomes lighter, and red spots or striped spots appear at the tips of the leaves.

Magnesium --- withered at the tip of the leaf, the color of the leaf tissue was pale at the tip of the leaf, and the color of the base of the leaf was normal.

Sulfur --- salt damage, leaf margins scorched.

Iron --- predispose to manganese deficiency.

Boron --- first leaf tip, after leaf margin yellowing, whole leaf yellowing, and defoliation, from mature leaves to produce disease zinc--- leaf tip and leaf margin color is lighter and then gangrene. The leaf tips have water-soaked dots.

Manganese --- abnormal defoliation.

The mesophyll tissue of copper --- is light in color and striped.

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"Tung tree"It is also known as paulownia, oil tung, and is generally referred to as sycamore. Common pest control of sycamore trees:

1.Paulownia anthrax symptoms. Paulownia anthracnose mainly affects paulownia leaves, petioles and shoots.

When the paulownia seedlings grow 1 2 pairs of true leaves, the disease begins to occur, and the lesions are green punctate at the beginning of leaf damage, and then expand to brown and nearly round, surrounded by yellow-green with a diameter of about 1 mm. After rain or when wet, pink conidia or black dots often appear on the lesions. In the later stage, the lesions are often ruptured, and the diseased leaves fall early.

Control methods: When selecting seedbed sites, it should be considered to choose places far away from the paulownia forest; If it is necessary to replant, the nursery should be thoroughly cleaned and the diseased seedlings and branches and leaves should be burned to reduce the initial impregnation; Strengthen the field management of seedbeds, and set up drainage ditches around the seedbeds to reduce the humidity of seedbeds; and time seedlings, weeding and top dressing to promote the robust growth of paulownia seedlings and improve disease resistance; In May and June, Bordeaux solution can be sprayed to prevent anthrax, and 65 times of zebsen zinc 500 times or 50 antibacterial special 800 times solution can be sprayed, sprayed once every 15 days.

2.Prevention and control of sycamore tree bags:

The first instar larvae are concentrated as pests, pruning insect branches, and eliminating larvae; Overwintering sacs, hanging high branches, artificially plucked to remove the elimination. In the larval stage, spray 10,000 times of emulsifiable concentrate, 90% crystal trichlorfon, 50% phosphine octathione, 50% acemethamidophos emulsifiable concentrate 1,000-1,500 times, especially trichlorfon effect, or spray 1000 times of green worm fungus containing 10 billion spores per gram.

Tung tree is a kind of tree that grows faster, has a better shading effect, and has fewer pests and diseases, but in recent years, due to the expansion of the area of fast-growing tung trees and other seedlings, a large number of pests and diseases have begun to appear on the tung tree, this pest has a great impact on the tung tree, sucks the sap of the leaves, eats the leaves of the tung tree, directly causes the leaves of the tung tree to dry up or form a network to cause great damage to the tung tree, but how to prevent and control the pests and diseases on the tung tree? Let's take a closer look. For the pests and diseases on the tung tree we should be aimed at the species of pests, develop an effective killing plan, for the pests and diseases on the tung tree we want to step to kill, must not be quick success, if the dosage is too large will cause burning to the leaves of the tung tree, although the pests are killed, but the leaves of the tung tree can not be photosynthesized, so the author suggests that the amount of pesticides should be paid attention to when applying the pesticide to the tung tree, it is best to try to be as large as possible in the case of not burning the leaves, and make a judgment on the pests on the leaves 3 hours after application. whether the pest has been killed, if it is not completely killed, a second application should be carried out until the pest is killed; In the daily planting we want to prevent pests, it is best to do regular insecticide, in the absence of insects to use a small amount of medicine to spray the tung tree, once a week to prevent pests and promote the growth of the tung tree.

Dear, I am glad to serve you, and the result of your inquiry is: what Fatong is most afraid of is drought and lack of water. It is a plant that prefers a moist environment and has a high demand for water.

If there is a lack of water for a long time, the leaves of the tung tree will wither, fall, and may even lead to the death of the plant. Therefore, keeping the soil moist is the key to planting the land of tung tree. In addition, it is also less tolerant of dry air, and if the environment is too dry, it will cause the edges of the leaves to dry out and fade.

Therefore, when planting tung trees, it is necessary to pay attention to maintaining appropriate humidity and moisture**, which can be met by regular watering and increasing air humidity. In addition, it is also sensitive to low temperatures and cold environments, and if it is subjected to severe cold weather, it may cause the leaves to be damaged or the plants to freeze to death. Therefore, in the cold season, it is necessary to pay attention to providing sufficient fibrillation to keep warm, such as covering a protective cover or moving indoors.

In short, the most feared is drought and water shortage, and it is also sensitive to dry air and cold climate, so it is necessary to pay attention to providing suitable moisture and temperature conditions during planting and maintenance to ensure the healthy growth of tung tree.

The landlord, the plane tree, is relatively thick, grown, green, and can play a role in shading.

In the case of hibiscus trees, it is difficult to grow to the strength of a sycamore tree, but it will bloom and look very good.

By the way, I'm from Chengdu, and we're called "Rongcheng" here, and the hibiscus flowers are beautiful. However, if you can only plant one, I think it's better to use the sycamore. Hibiscus flowers have to be many, many together to feel it.

Also, when I was a child, I lived with my grandfather, and the small county town there was planted with sycamores, and it was really shady when summer came

Well, but if the landlord's house has the conditions, I think you can plant some peach trees or pear trees, which are beautiful when they bloom!! And there are fruits to eat, quack

If you are particular about paying attention to it, I suggest you ask someone in your village who knows feng shui. When I was young, I planted a sycamore tree in front of my house with my grandfather, and then my grandmother couldn't move when she wrestled, and when my grandmother came to see her, she saw the sycamore tree in front of my house, and said that the location was not good, and it was blocking something...... somethingI'm sorry, I was too young to remember.

Plant fruit trees, and when they bear fruit in the future, give me some o( o haha