What are the three major insect pests that need to be controlled, what are the pests and diseases of

Most of the varieties of red maple grow well in the acidic, loose and breathable, thick loam soil, as a high-grade variety in the color seedlings, the growth rate of red maple is slow, not shade tolerant, and most of the red maple varieties are burned in the strong sunlight. The three major insect pests that are extremely harmful to red maple need to be carefully controlled.

Introduction and control methods of the three major insect pests of red maple:

1. Leafhoppers: Homoptera, leafhopper family. Body length 3-15 mm.

There are 2 monoculars, and a few species do not have monocular. The tibial joints of the hind feet are ridged with 3-4 rows of spiny hairs. The tibial spines of the hind feet are the most significant identifying feature of the leafhopper family.

In the high temperature, high humidity and rainy season in May, leafhoppers feather and suck the leaf juice of red maple leaves, resulting in small sieve white spots on the leaf surface and dull leaf surface.

Prevention and control methods: 1. In severe cases, 40 dimethoate can be used, mixed with 1000 times of chlormeate powder, and the spray must be sprayed from the inner chamber of the canopy.

2. Use black light to trap and kill adult insects.

3. Sprayed deltamethrin wettable powder 2000 times, or 90% trichlorfon stock solution 800 times, or 50% pine borer emulsifiable concentrate 1000 times, veratroline wettable powder 600-800 times. When using drugs for prevention and control, attention should be paid to spraying from the periphery to the middle, and increasing the amount of pesticides in the middle part, and cleaning up the weeds around the planting site in time and spraying with drugs.

2. Longhorn beetle: Longhorn beetle is a general term for insects of the family Coleoptera, with long antennae, often exceeding the length of the body. It is a herbivorous insect that harms woody plants and is the main pest of red maple.

The larvae are the most infested, ovulating in mid to late June and not hatching until October. Longhorn beetles ovulate more often at night in cracks in the bark at the base of the tree near the surface. The larvae are circumferentially bored in a curve and then downwards into the xylem.

Powdery feces are yellowish and drain from the ground. Dry-boring pests mostly bury directly into the pith from the middle of the trunk to the branches, and then to the cortex outward.

Control method: During the incubation period in June and July, spray the trunk with 40 dimethoate 800 times liquid, or coat the base with 5 times the concentrated liquid ring with dimethoate 10 cm wide, which can kill insect eggs. If insect droppings are found, you can use an iron rod to remove the moths and wring the larvae to death.

For the dry-boring pests that have entered the trunk, 18 insecticidal aqueous agent 50 times can be injected until overflowing, which can kill the larvae immediately.

3. Moth: The name of the insect, which is Lepidoptera, the family of spiny moths. With larvae as the pest plant leaves, the young larvae eat the mesophyll, and the damaged leaves form a net, which mostly occurs in August, encroaching on the foliage, and even gnawing the whole leaf in serious cases.

Control method: 90 trichlorfon 800 times liquid spray can be used.

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Pest control and management methods of red maple.

Pest control. 1) Underground pests such as grubs and mole crickets gnaw on the seedlings and stems, which are easy to cause seedlings to die, and can be watered with 1000 times of Lesben liquid or 50% phosphine emulsifiable concentrate 1000-1200 times liquid.

2) Infestation the leaves of red maple such as beetles, stinging moths, aphids and other common red maple pests, resulting in poor growth of seedlings, such as: aphids, beetle adults can be sprayed with 10% imidacloprid powder 1200-1500 times; Stinging moth can be controlled with inulin pesticides (according to the instruction manual).

3) Stem boring pests such as longhorn beetle, heartworm and so on harm the branches of red maple, resulting in the dead branches of red maple seedlings or even the whole plant, can be sprayed in the peak period of adult beetle: 6-7 months with 1500-2000 times of cypermethrin liquid spray crown, spray once every half a month or so, spray twice; Or inject pesticides such as dichlorvos or lesburn into the branches at the mouth of the insect tract and seal them with sticky soil.

Diseases such as brown spot, powdery mildew, rust, etc., should also be prevented.

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Common diseases of red maple are powdery mildew, bacterial perforation, and leaf spot.

1. Powdery mildew:

This kind of disease occurs in the autumn of each year, can overwinter, can be spread through rain and air, will make the plant lose its leaves early, seriously harm the appearance of the plant.

2. Bacterial perforation disease:

When the temperature is 25 degrees Celsius, and other pests invade, it is easy to cause this disease, and in severe cases, the whole plant will die.

3. Leaf spot disease:

It occurs from June to September, mainly due to high temperature and excessive humidity.

Prevention and control methods::

In the early stage of the disease, you can use the relevant agents to spray to enhance the air circulation, after the winter, all the back eroded branches and leaves are cut off, together with the old and weak branches are also removed, and then remove all the leaves of the potting soil, and turn the soil, but also to prune the plants that are too dense. If it is serious, the soil can be replaced, and the original soil must be cleaned up.

Maintenance of red maple:

1. Feeding: You can choose to use humus, laterite, coarse sand mixed soil culture, with bone meal as base fertilizer. Because the root extension ability of red maple is strong, it should be cultivated in deep tube pots.

2. Placement: It is best not to put it indoors, but to put it in a well-lit and ventilated place. Or during the growth period, it can also be placed outdoors in a leeward and sunny place, moved to a semi-shaded place in summer, avoid strong light exposure, and spray some water on the leaf surface in the morning.

3. Watering: Red maple likes moisture, and the weather is hot in summer, so you can water more, and you don't need to do too much daily, just to ensure that the daily soil has a certain degree of moisture, and at the same time, this is also to ensure the future canopy.

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Summary. Hello dear, red maple has few pests and diseases, red maple with a dry diameter of more than 3 cm will be infected by fungi in May and June every year, especially in plain areas, the planting density is large, the plot is damp, and the disease is more serious. It is manifested as the leaf tip is rolled white, there are dark red spots on the leaf surface, perforated after sun exposure, only the leaf veins and petioles are left in September and October, and even the whole leaf is withered, the tender shoots are dried up, only the branches are left, the whole plant dies in the cold season of winter and spring, and the leaves grow in spring, and some will also die.

Hello dear, red maple rarely has pests and diseases, the red maple on the dry diameter of 3 cm to search for the sun will be infected by fungi in May and June every year, especially in the plain area, the planting density is large, the plot is damp, and the disease is more serious. It is manifested as the leaf tip is reversed white, the leaf surface has dark buried fierce red spots, perforated after sun exposure, only leaf veins and petioles are left in September and October, and even the whole leaf is withered, the tender shoots are dried up, only the branches are left, the whole plant dies in the cold season of winter and spring, and the leaves grow in spring, and some will die and bend and leak the bridge.

There is sawdust-like powder next to the tree, I don't know what insect pest causes it, how**? Thank you.

Potted red maple. The roots of the red maple are bitten by insects, first to repel the insects and then beat, the bitten will not get rid of it, clean it, and maintain it well in the later stage.

The pest control measures of red maple are as follows: red maple has few pests and diseases, and the red maple with a dry diameter of more than 3 cm will be infected by fungi in May and June every year, especially in the plain area, the planting density is large, the plot is shady and damp, and the disease is more serious. It is manifested as the leaf tip is reversed white, the leaf surface has dark red spots, perforated after sun exposure, only leaf veins and petioles are left in September and October, and even the whole leaf is wilted, the tender shoots are dried up, only the branches are left, the whole plant dies in the cold season of winter and spring, and the leaves grow in spring, and some will also die.

Red maple is suitable for planting in mountainous areas and semi-mountainous areas, preferably acidic sandy thick loam soil, it is not tolerant to shade and afraid of sun, and grows slowly.

Planting and fertilization should be based on farmhouse fertilizer, heavy phosphorus and light nitrogen, red maple can not be chased, sunscreen, anti-burn shoots, at the same time to improve ventilation and lighting, improve disease resistance.

Common diseases of red maple include powdery mildew, bacterial perforation, and leaf spot. 1. Powdery mildew: This kind of disease occurs in the autumn of each year, can overwinter, can be spread through rain and air, will make the plant lose its leaves in advance, and seriously endanger the appearance of the plant.

2. Bacterial perforation disease: when the temperature is 25 degrees, coupled with the invasion of other pests, this disease is prone to occur, and in severe cases, the whole plant will die. 3. Leaf spot disease:

It occurs from June to September, mainly due to the high temperature and the excessive humidity of the remaining calendar. Prevention and control methods: In the early stage of the disease, you can spray with relevant agents to enhance air circulation, cut off all the branches and leaves that have been eroded on the back after winter, and remove them together with the old and weak branches, and then remove all the fallen leaves of the potting soil, and turn the soil, and also prune the plants that are too dense.

If it is serious, the soil can be replaced, and the original soil must be cleaned up.

In the fertilization of red maple, avoid partial application of nitrogen fertilizer, and increase the appropriate amount of phosphorus and potassium fertilizer to promote the growth of plants and enhance disease resistance. At the same time, it is necessary to combine fertilization, often loosen the soil, enhance the air permeability of the pot, ensure the normal growth and development of the root system, and improve the absorption function.

At the end of autumn, the diseased leaves of red maple should be removed in time and burned in a concentrated manner to reduce the overwintering pathogenic bacteria. In the summer and autumn high temperature season, the flower pot should be placed in a diffused light and a well-ventilated shade to prevent exposure to the sun.

At the beginning of the disease, the leaf tip and the leaf margin of the upper part of the leaf produce water-stained green spots, and then as the disease progresses, the diseased part appears scorched, and gradually expands to the lower part and the inside of the leaf, and the upper half of the leaf dies.

The junction between the diseased part and the healthy part is russet, the middle is dark red, and finally the whole leaf 3 4 is dead, only the base of the leaf is green, the tip of the dead part of the leaf is curled, grayish-white, and the whole leaf is like a fire. Due to the loss of chlorophyll in the leaves, photosynthesis is seriously affected, so that the growth of the plant is weakened and the ornamental value is lost.

Red maple is a typical potted plant that can be used as both a green seedling and a viewing scene, so it has been very popular with people in recent years. In the growth process of red maple, like other green seedlings, it has relatively tenacious vitality, but the green seedlings are most afraid of the threat of pests and diseases in the growth. The most feared thing in the growth of red maple is probably leaf blight.

When you have leaf blight, the tip of the leaf and the upper edge of the leaf surface produce small light green spots at the beginning of the disease, and as the disease spreads, the diseased part appears scorched, and gradually expands to the lower part and the inside of the leaf, the upper half of the leaf dies, and finally three-quarters of the whole leaf dies. Due to the loss of chlorophyll in the leaves, it seriously affects its photosynthesis, weakens the growth of the plant, and loses its ornamental value. Due to the close relationship between the occurrence of the disease and rain, the infection will be repeated during the rainy season, and the disease is usually most severe from August to October.

In addition, poor land drainage, high soil temperature, and partial application of nitrogen fertilizer can also lead to the occurrence of the disease. In early autumn, under the conditions of high temperature and strong light, the leaves are burned, which will aggravate the development of the disease. In the prevention and control, it is necessary to fertilize the fertilizer, avoid partial nitrogen fertilizer, and increase phosphorus and potassium fertilizer in an appropriate amount to promote the growth of plants and enhance the ability to fight diseases.

Usually watering should not be excessive, let alone water accumulation for a long time; Usually combined with loose soil, enhance soil permeability, ensure the normal growth and development of roots, and improve the absorption function; In the high temperature season, it is necessary to ventilate and shade the sun to prevent exposure to the sun.