Can you kill insects for 20 days when you just planted sugar oranges this year?

It can kill insects. Anthrax.

strengthen cultivation management to prevent partial application of nitrogen fertilizer; In spring and summer, before the shoot extraction period and fruit ripening, mancozeb, copper pineate, zeczeb, chlorothalonil and other spraying canopy can be used, and sprayed once in about 15 days, 3-4 times in a row.

Foot rot. Timely drainage, improve the light and ventilation conditions in the park, and strengthen the prevention and control of longhorn beetle and other trunk pests; Disease-resistant rootstocks such as citrus aurantium, citrus aurantium, and orange are selected, and disease-resistant rootstocks can be used to replace the rootstocks for susceptible plants. Agents to prevent:

After scraping off the lesions, apply the drug, and the commonly used drugs are carbendazim, methyl tobuzin, etc.

Mites. Citrus red spider, four-spotted yellow spider, rusty tick). Before and after flowering (March-May) and autumn (September-November) are the key periods for the control of spider mites

The density of insects before flowering is up to 1-2 leaves, and after flowering and in autumn up to 5-6 leaves, it is necessary to carry out control. The main periods for the control of rust lice are the spring shoot extraction stage, young fruit stage and fruit expansion stage: the rust color first appears on the back of the leaves of the spring shoots of that year; When the population density of insects on leaves or fruits reaches 2-3 per leaf, it is immediately controlled.

Commonly used agents are thiobenone, dadifolin, alkyne mite, bromodifen, dimethyl, etc., pay attention to the protection of natural enemies such as long-whiskered mites, blunt mites, mite-eating ladybugs, Japanese square-headed beetles and lacewings.

Scales. Sagittal scales, red wax scales, blown cotton scales, etc.). Key periods of drug prevention and control:

Sagittal scales are the first generation nymph stage, red wax scales are the larval stage when a large number of tips are harmful (generally from early and mid-May to mid-June), and cotton scales are the larval stage. Commonly used drugs are thiazinone, chlorphos, matrine + nicotine, Lesben, engine oil emulsion, etc. Pay attention to improving the ventilation and light transmission conditions in the park; Protect and utilize natural enemies such as the Japanese square-headed beetle, red-spotted ladybug, lacewing, **aphid wasp, Australian ladybug, and large red ladybug.

Aphids. The damage rate of new shoots is 25%, and it should be sprayed immediately. Commonly used drugs are acetamiprid, dimethoate, butylthioccarb, etc. Attention should be paid to the protection of seven-star ladybugs, large lacewings, aphid-eating flies, aphid wasps, etc., cutting off overwintering insect eggs and reducing the number of pests.

Leaf miners. The key period of prevention and control is the summer and autumn shoot extraction period (early to mid-July). Timely erasure of sporadic summer and autumn shoots, combined with fertilizer and water management, to promote the new shoots of plant extraction strong and neat.

Pesticide prevention and control: spray when the new shoots are pumped to 1-2cm, spray once every 7-10 days, 2-3 times in a row. Commonly used agents are avermectin, borerdan, cyhalothrin, etc.

Beetles. From May to August, the adults of the star beetle and the green orange beetle were manually killed at noon on a sunny day, and the adult beetle of the brown longhorn beetle was killed in the evening. Timely removal of eggs, hatchling larvae and pruning of infested branches; Soak cotton or cotton yarn with dimethoate and other insecticides to plug the wormholes, and then seal the wormholes with soil to poison the larvae.

Flower bud maggots. At the time of budding, choose methyl dichloride powder, diazinon granules, etc., add fine soil and mix evenly and sprinkle on the soil surface of the tree plate, once every 7 days, 2-3 times in a row; When the diameter of the flower bud is 2-3mm (when it is white), the crown is sprayed with sulfur and phosphorus, trichlorfon, etc.; Remove the infested flower buds as soon as possible and concentrate on deep burial or boiling; Deep ploughing of garden soil in winter can eliminate some overwintering pests and pupa.

The cause of sand sugar orange huanglongbing is the long-term use of a large number of chemical fertilizers, pesticides, fungicides, herbicides, resulting in the lack of certain trace elements in the soil, through the application of trace element fertilizer to improve the soil, biological root, prevention of the occurrence of huanglongbing is feasible, but the tree that can be ** has been sick is not very reliable, because the cost is very large and there is no economic value, and the fruit tree that can be resurrected is not much, for example: a middle-aged woman has cancer, and life can be extended after going to the hospital. But you still expect her to have children, is it possible that she is so weak? Let's quickly change to red-fleshed dragon fruit, red-fleshed dragon fruit can bear fruit 15 times a year, and orange plants can only bear fruit once a year.

How to manage fertilization of new varieties of sugar oranges The new plants of sugar oranges are relatively small, so the fertilization is mainly sprinkled and watered, and the amount is mastered, the new seeds are easy to burn the roots, and the orchard does a good job of drainage, or the seedlings will be damaged if they are soaked in water.

Before and after flowering, attention should be paid to the prevention of anthracnose, canker, scab, mites, leaf-eating pests and diseases. Otherwise, when it is damaged by pests and diseases during flowering, it is often unfavorable to spray insecticides and fungicides, and once the prevention and control opportunity is missed, it will cause the loss of flowers and fruits.

For the prevention of anthrax and scabs, it is recommended to start taking the medicine once every 7 days when about 5 mm is withdrawn from the spring shoots. The drugs used are: 25 prochloraz 1000 2000 times, or 2000 times of heguoli (enazole), or 36 vegetane suspension (frost urea manganese zinc) 600 times, for the prevention of canker disease (bacterial disease), you can use 20 boya virus clear (morpholine hydrochloride?).

Copper acetate) wettable powder 350 times, or 72 agricultural streptomycin sulfate 3500 times, or 56 ammonium disensen 600 times. For the prevention and control of mites such as red spiders, it is advisable to grasp the prevention and control in early March, when the weather begins to warm, and the overwintering adult mites and newly hatched young mites begin to have new leaves, (at this time, the pest mites are generally weak in drug resistance). Drugs are available:

2500 times of acar, 2000 times of 5 thiofenone, 1500 times of 10 liuyangmycin, alternately used for prevention and control.

<>1. Purchase high-quality disease-free seedlings.

The quality of seedlings is directly related to the later development of fruit trees. Seedlings are the foundation of the tangerine industry, and healthy and high-quality seedlings can ensure the sustainable development of the tangerine industry. Requirements for high-quality seedlings:

The height of the grafting interface should reach centimeters, the height should reach 50 centimeters, and it is best to have more than 3 complete branches, and the root system should be intact.

2. Reasonable planned dense planting.

The purpose of planned dense planting is to use the vacant land and space in the early stage to increase the yield of the orchard, which is about twice as high as the yield of the normally managed orchard.

3. Management of young trees.

Two years before flowering is the young tree stage, and the focus of management at this time is to strengthen tree nutrition, reasonable pruning, and cultivate a strong canopy skeleton and good root system.

4. Prune after planting.

After planting, leave 5-6 leaf stubs on the main branch on the main stem to promote the germination of new shoots, and then leave 3-4 branches with consistent growth, medium growth and uniform distribution as the secondary main branches, and the new shoots will be shortened again after maturity.

5. The main task of the fruit tree in the second year is to reasonably arrange the shoot period and expand the canopy. <>

6. Keeping flowers and fruits is the key.

The quantity and quality of spring shoots directly affect the flowering amount of fruit trees, so the application of spring shoot fertilizer before spring shoot germination can promote shoot flowering.

7. Summer and autumn shoots.

The germination of summer shoots of fruiting trees will compete with the fruit for nutrients, and the early summer shoots should be harvested from the end of April to the beginning of May, and the dense branches, diseased and insect branches should be removed in combination with summer pruning, and the long branches and unfruited branches should be shortened.

According to the specific problem type, the steps are disassembled, the cause is analyzed, the content is expanded, etc.

The specific steps are as follows: The main reason for this is ......

The planting techniques of sugar tangerines are as follows:

1.Planting density: The planting specifications of sugar oranges vary depending on the variety, rootstock, soil, etc. Usually the anvil and the soil are fertile; Dwarf anvils or thin soils are denser. Generally, most of the planting density is 80-110 plants per mu

Feet (rows) 7 feet (plants) 80 acres.

Feet (rows) 6 feet (plants) 100 acres.

Feet (rows) 6 feet (plants) 110 acres.

2.Preparation for gardening: There are three types of tangerine planting: mountainous, hilly and paddy fields, each with its own characteristics.

1) Mountainous and hilly land: the soil layer is thick, but thin, and deep turning and pressing green is the key to successful planting. Before planting, dig a pit, the pit is wide and deep.

It is better to dig a trench, bury weeds, lime and miscellaneous manure in several layers, about a meter above the ground. Digging the pit and burying the soil should be completed at least 1 month before planting, so that the soil and miscellaneous compost in the pit can be decomposed.

2) Paddy field: The topsoil of paddy field is fertile, but the soil layer is thin, whether it can drain water and reduce the groundwater level is the key to the success of planting, and the groundwater level should be reduced at least meters. Paddy field planting sand sugar orange can not dig pits, but should raise the mound, the mound is about meters high, the diameter of the pier surface is meters, and the drainage ditch should be opened around the field to ensure that the drainage can be carried out at any time.

3.Planting time and method:

Autumn planting: September to November, after the autumn shoots are ripe. The best planting period is when irrigated with water, and there is plenty of time to resume growth after planting. In the cold mountainous areas where the autumn drought is severe and the cold dew and wind come early, the autumn planting should be early rather than later, and it is best to plant before mid-October.

Winter planting: From January to February, spring shoots may begin to germinate before budding. After the cold, it gradually warms up, and the new roots grow fast after planting, and the survival rate is high. The disadvantage is that the spring spouts of the year are different.

Spring planting: April and May spring shoots are planted after they are old and mature. At this time, the rain is abundant, the climate is mild, and it is easy to survive and grow quickly after planting. In autumn and winter, it is better to choose spring planting in areas where there is no water to irrigate.

2) Planting method: When planting seedlings, two people should cooperate, and cover the root neck with fine mud gently and steadily. Pour enough water to fix the roots, so that the roots are close to the soil, and finally cultivate the soil into a copper disc shape, so that it will not overflow when watering, and then cover the mound with a layer of miscanthus or weeds to moisturize.

4.Post-planting management: If there is no rainfall after planting, water every day for 3-4 days to keep the soil moist, and then depending on the lack of water of the plant, water once every 2-3 days until it survives. 1 week after planting, the cave soil has slightly sunken and can be inserted.

The branches support and fix the plant to prevent the wind from shaking the roots and affecting the survival. If the leaf curl is found to be serious after planting, some branches and leaves can be appropriately cut off to improve the survival rate. Generally, some plants begin to take root half a month after planting, and they can be thinned after one month.

Thin fertilizer, add 5-6 times of water to the urine of rotting acquaintances, or urea and water to make water, apply 1-2 spoons per plant to promote early roots and more roots of young trees. After that, drench 1-2 times a month. New roots have not erupted, and the leaves have not returned to normal growth.

Growing plants should not be fertilized too early, so as not to cause fertilizer damage and affect survival.

At the seedling stage of sugar oranges, choose drugs according to the presence or absence of pests and diseases. There are many kinds of citrus pests and diseases, and the following introduces the main symptoms and control methods of several pests and diseases

1. Scab disease. It is mainly harmful to young branches and leaves, young fruits. The infected leaves begin to appear with small water-stained spots, which turn waxy yellow.

After the fruit is damaged, many nodulous protrusions often grow. Control method: When the spring bud germinates 1 cm, spray 50 times of 50 antibacterial special or 800 times of 70 methyl tobuzin.

For the second time, at the end of the flowering, spray 70 methyl tobuzin 800 times.

2. Anthrax. Anthrax is mainly characterized by the appearance of small red spots on the lesions under rainy and high temperatures, and black spots in dry conditions, which are in the shape of a whorle. Prevention and control methods:

In the tender shoot stage and young fruit stage, spray 1 2 times each, you can use 0 5 equivalent Bordeaux liquid, or 50 antibacterial special 500 times, or 70 methyl tobuzine 800 times.

3. Huanglongbing. Main symptoms: In addition to the appearance of yellow shoots, the main features that identify the disease are:

The base and edges of the leaves are yellowed, and irregular yellow-green mottled leaves appear. Control methods: (1) Select disease-free seedlings and plant them in isolated areas.

2) Strictly control the vector of citrus psyllids, treat insects and protect shoots with drugs in each tender shoot stage, spray with 1000 times of dimethoate, 2000 times of aphid lice, and 2000 times of imidacloprid. (3) Diseased trees should be dug up in time to eliminate the source of disease. 4.

Mites are mainly red spiders and rusty ticks. Spider mites damage leaves, fruits, and shoots, and the damaged leaves lose their luster and are grayish-white. Rusty ticks are mainly harmful to fruits, resulting in black-skinned fruits.

Red spider control method: In winter, the garden is cleared with a stone sulfur mixture of 1 degree from Baume. In the growing season, caricides such as dicofol, goldba, hydroamidophos, and gite can be sprayed in turn, once every 7 10 days, 2 3 times in a row.

4. Rust tick control: From June every year, observe the density of the insect population, and when the rust tick is a pest, spray immediately to prevent and control it, and the drugs used are the same as the drugs used to prevent and control red spiders. <>

1. Take advantage of the characteristics of the larvae to crawl into the soil along the branches and pupate after maturity, and spray the soil with poison and insecticidal and pupal in August and September. You can use 2000 times of 48% maggot emulsifiable concentrate (sharp worm clear) to spray or drench near the main stem of the plant. Since the larvae of malignant leaf nail pupa generally penetrate into the soil to a depth of about 1 cm, the use of liquid medicine should not be excessive, and it can penetrate into the topsoil about 2-3 cm to avoid waste.

2. In the peak stage of initial hatching, 5000 times of emamectin benzoate microemulsion, or 800 times of 50% tiger frog emulsifiable concentrate, or 3000 times of good chlorine microemulsion, alternately spray the back of the leaf every 7-10 days, and spray 2-3 times in a row.

3. Scales. There are mainly blowing cotton scales, shield scales, etc., which weaken the tree in order to damage the branches and fruits, induce soot disease, and reduce the yield and quality of fruits. Prevention and control methods:

In winter, clear the garden with 16 to 20 times the pine mixture, and cut off the insect branches. The focus of control is to grasp the first generation of nymphs in May and June during the peak period of continuous spraying 2 times, the use of pesticides are: 40 dimethoate 500 800 times, 40 hydroamidophos 800 times, these two drugs add 100 times of oil emulsion, the effect is better.

1500 times for scalp killing, 1500 times for quick culling. <>