How to control citrus pests and diseases? What are the main pests and diseases of citrus in Septembe

Citrus pest control is the key to citrus planting, and whether the pest control is good or not has a direct impact on yield, quality and even the health of fruit trees and orchard safety.

There are many types of citrus diseases and insect pests, which are mainly divided into insects, mites, and pathogens, such as common scale insects, whiteflies, aphids, thrips, longhorns, large fruit flies, flower bud maggots, leaf miners, red and yellow spiders, anthrax, cankers, sand skin disease, brown spots, huanglongbing, etc. Some harm flowers, some harm fruits, some harm branches and leaves, and some affect the entire fruit tree.

For how to control citrus pests and diseases, if this problem is explained in detail one by one, a book can be compiled. I would like to share my views on integrated pest management.

1. Prevention and control of pests and diseases, and advocate prevention. The first is to enhance the tree strength of fruit trees and increase their resistance to insects and diseases. Comparatively speaking, weak trees are more likely to be damaged by pests and diseases.

For example, increase organic fertilizer, reduce inorganic fertilizer, and improve soil fertility. Strengthen pruning and thinning, increase the internal light and ventilation of fruit trees, and reduce the breeding places of germs and insect eggs. The orchard is regularly ploughed and turned over to improve soil aeration.

Drainage measures should be taken in the rainy season for orchards, and irrigation and water replenishment should be done in the dry season. Reduce mechanical injuries to fruit trees. Through these measures, the fruit trees are in a healthy growth environment, and there are many fewer pests and diseases.

2. Citrus pest control, garden cleaning is very important. After the citrus harvest in winter and spring, orchard cleaning is a great help for pest control in the coming year. At this time, the pests and diseases are in a dormant state, prune first, cut off the dead branches and diseased branches and insect branches too dense branches, and then spray the orchard to clear the garden, you can use stone sulfur mixture, you can also use mineral oil, etc., the control effect is good.

3. Comprehensive prevention and control. Many pests and diseases of citrus have a mutually reinforcing effect, so when spraying and controlling many pests and diseases, it is advocated that bacteria, pests, and mites are controlled together. Some drugs also have a promoting effect and can improve the prevention and treatment effect. The premise is that the drugs can be mixed.

4. Grasp several critical periods of prevention and control. The first is to prevent flower buds maggots, thrips, aphids, and sand skin disease during the flowering period. In the summer and autumn shoot extraction period, canker, anthracnose, red spiders, scale insects, leaf miner moths, etc.

In other periods, targeted prevention and control will be carried out. For areas with a high incidence of ulcer disease and huanglongbing, it is recommended to carry out single prevention during the high incidence period.

5. Increase auxiliary measures. If conditions permit, measures such as hanging insecticidal lamps, yellow paperboard, and predatory mites can be taken to assist in the prevention and control of pests and diseases.

Citrus pest control is a systematic learning process, which requires continuous summarization of experience and continuous improvement of technical level.

There are many common pests and diseases in orange trees, such as anthracnose, canker, spider mites, thrips, etc., which can affect the growth of fruit trees. In addition to prescribing the right medicine and spraying the agent, it is very necessary to clear the garden in winter. Usually the insect branches, bad branches, and dry old branches in the garden should be pruned, and the fallen leaves and stumps should be completely burned or buried deeply.

1.To buy seedlings, you should buy sterile and disease-free seedlings, go to the professional seedling seedling base to buy, rest assured.

2.Agents should be used in rotation.

3.Seize the best time to treat medication.

4.The spraying should be in place, leaving no dead ends.

5.Trim properly.

6.Strengthen fertilizer and water management in orchards.

What kind of medicine is used for prevention and treatment, and the ratio is not clear

In September, citrus should mainly control anthracnose, canker, mites and other pests and diseases, and citrus should be controlled with bifenazide, spirodifen, pyridoxine, and ethoxazole. Bacterial canker disease, the prevention and control of anthracnose with phyloconazole, chunleimycin, zhongshengmycin, copper preparations and other agents mainly rely on prevention, the first effect is poor, the prevention can be used copper preparations, Daimeng, propylene zinc, prochlorazole, tebuconazole, phenyl ether, dihydroanthracene, etc., protection + ** method of prevention.

1. Scab disease: When preventing and controlling citrus diseases, it is necessary to choose varieties with strong disease resistance for planting. 2. Ulcer disease:

Cut off the severely infected branches and leaves of the plants and apply plant ash for disinfection. 3. Spider mites: In winter, you need to scrape off the rotten bark on the trunk.

4. Scale insects: citrus needs to be sprayed 1-2 times of imidacloprid in the early stage of the disease.

1. Scab disease

The main disease of citrus is scab, scab will make yellow water-stained small spots appear on the diseased leaves, and the disease spots will be raised and lignified in the later stage.

2. Ulcer disease:

Canker disease will damage the branches and leaves of citrus, so that the diseased part will appear crater-like cracking, in severe cases, it will lead to citrus leaf and fruit drop, you need to prepare sharp and sterilized scissors, cut off the branches and leaves with serious citrus infection, and then apply plant ash to the fracture for disinfection.

3. Red spider

The main insect pest of citrus is the red spider, the red spider will make the leaves appear pale spots, the control of citrus red spider, you need to use a knife in winter to scrape off the overwintering eggs on the bark, and to remove the weeds around the citrus in time to reduce the source of insects.

4. Scale insects

Scale insects will harm the branches and leaves and fruits of citrus, when controlling citrus scale insects, it is necessary to spray imidacloprid 1-2 times a week in the early stage of the disease to eliminate pests and promote the healthy growth of plants, and to cut the branches and leaves that are too dense for scale insects to improve ventilation and air permeability.

Hello dear. There are several common methods of control of citrus diseases and pests: 1. Citrus canker Citrus canker is a bacterial disease caused by Bacterium flavour, which changes with the rise of temperature and humidity. The probability of canker infection will also become larger, mainly harming citrus fruits, slip bridge leaves, it is generally recommended to choose the grafted seedlings of citrus aurantium dead wood, orchard weeds should be thoroughly removed, in humid weather to pay attention to pruning, wiping, reduce the occurrence of diseases, for vulnerable trees need to spray foliar fertilizer, improve disease resistance, generally spray potassium fulvic acid, seaweed fertilizer to enhance resistance.

In addition, you can use 2% spring leimycin 600 800 times solution, 70% streptomycin 1000 1500 times solution for prevention and control, in the rainy season, pay attention to spray once every 10 days. 2. Citrus anthracnose is easy to occur in high temperature and rainy environment, and it is generally necessary to strengthen water and fertilizer management to improve plant vitality. For prevention and control, mancozeb, carbendazim, thiophanate-methyl and other fungicides with protective, preventive and high-quality properties should be used in a timely manner before the onset of the disease, and 70% agricultural streptomycin 1000 times should be used for prevention and control after the onset of the disease.

3. Citrus brown rotBrown rot is a common and serious fungal disease on citrus, which mainly infects branches and leaves, trunks and forests in the early stage, and infects fruits in the later stage, resulting in fruit yield reduction. Plant protection before and after rain prevents leaf infection, pyraclostrobin, azoxystrobin and thiophanate-methyl are used for protection during the fruit stage, and prochloraz is kept fresh after harvest. 4. Citrus lipid spot yellow spot disease This disease mainly infects citrus shoots, and the leaves are susceptible to the disease, and after the leaves are susceptible, the back of the diseased leaves appears pale yellow or yellow-brown oil-impregnated herpes-like small spots, which are irregular pale yellow spots, and turn black-brown in the later stage, which will cause the tree to weaken and not bear fruit and not grow buds.

Prevention and control measures: pay attention to plastic pruning, remove weak branches, strengthen field water and fertilizer management, and pay attention to proconazole to remove germs for prevention and control. 5. The pathogenic nematode of citrus root-knot nematode disease is parasitic between the root bark and the middle column of citrus trees, so that the young root tissue is overgrown and forms nodules of different sizes.

1. Citrus huanglongbing

Citrus huanglongbing, also known as yellow shoot disease, is a domestic plant quarantine object disease, seedlings and young trees die within 1 2 years after the onset of the disease, and adult trees lose their ability to bear fruit within 2 3 years after the onset of the disease.

2. Citrus canker

Citrus canker is the object of plant quarantine at home and abroad, seedlings and young trees are seriously damaged, resulting in deciduous and dead branches, weak trees, and fruit damage is light with disease scars, reducing quality, and heavy fruit dropping, reducing yield. The disease affects leaves, shoots and fruits. The lesions are pinhead-sized, yellow, water-soaked at first, and then expand to nearly round lesions, bulging on the front and back of the leaves, corked, rough surface, grayish-brown, and crater-like cracking.

3. Citrus scab disease

Citrus scab disease mainly damages leaves, shoots and fruits, causing leaf drop and fruit drop. The unfallen fruit is small and deformed, the quality is deteriorated, and the growth of the damaged new shoots is poor. The disease can only infect the young tissues of leaves, shoots and fruits, and the affected leaves initially appear water-soaked small dots, and then gradually expand, showing waxy yellow to yellowish brown, diameter, and cork.

Prevention and control measures

Strict quarantine prohibits the introduction of seedlings and scion from diseased areas in new areas and disease-free areas.

Cultivate disease-free seedlings, establish disease-free nurseries, and select areas without huanglongbing and citrus psyllids, and select detoxified seedlings.

Insect control and timely prevention and control of citrus psyllids.

Dig out the diseased plants, strengthen the inspection, and deal with the diseased plants in a timely manner.

The above content reference: Encyclopedia - Citrus.