How can the common diseases of tea be prevented?

It should be that you can water more properly, and you should also pay attention to the number of fertilization, and if necessary, you can also spray some pesticides, so that you can prevent pests and diseases. More importantly, some of the dead branches and leaves should be cut off. Of course, some agents should also be used.

If you want to carry out prevention and control, you must pay attention to spraying pesticides, pay attention to preventing pests and diseases, and pay attention to proper watering.

The seeds of the tea can be disinfected at the time of planting, and the tea leaves should also be observed during the growth of the tea leaves, so that pests can be controlled.

It can be controlled by spraying pesticides, or choosing the right variety for planting, we must do a good job of protection in advance, pay attention to the amount of watering, pay attention to the amount of fertilizer, and use some physical defense methods for prevention and control.

The main diseases of tea trees are tea moire leaf blight, tea anthracnose, tea white star disease, tea round red star disease, their causes are different, and the control methods are also different. Let's take a look at this problem**, I hope these contents can help friends in need.

Tea moire leaf blight is the most common leaf disease on tea plants, mainly harming old leaves and adult leaves, mostly occurring in leaf tips and leaf margins, and yellow-green spots appear on the front of the leaves in the early stage. For tea gardens with serious diseases, it is necessary to pay attention to strengthening fertilizer management and removing weeds in time, rational fertilization, avoiding partial application of nitrogen fertilizer, and increasing the application of phosphorus and potassium fertilizers, so as to promote the growth of tea trees and improve the disease resistance of tea trees themselves.

Tea anthracnose generally occurs on the adult leaves, and the lesions mostly occur on the leaf margin, leaf tip, and leaf front, and then expand into irregularly shaped lesions. The prevention and control mainly strengthens the management of fertilization, avoids the single application of nitrogen fertilizer, combined with the application of potassium fertilizer, so as to inhibit the onset of disease and drain the water when there is more rain. The control of pesticides can refer to tea moire leaf blight.

In addition, the selection of disease-resistant varieties is also one of the important ways of prevention and control.

Tea scab is generally under the conditions of low temperature and high humidity in high mountain tea gardens, and the disease of young leaves is more serious. The prevention and control methods focus on increasing fertilizer and reasonable picking, promoting the growth of tea trees and improving disease resistance. Tea round red star disease is a relatively common disease in recent years, especially in the tea areas with high temperature and high humidity in the high mountains, and the disease is more serious in young and mature tea trees.

After the onset of tea trees, the growth is poor, the buds and leaves are small, and the dry tea made from the diseased leaves has a bitter taste, which has a great impact on the yield and quality of tea. Prevention and control methods: spray 65% zebsen wettable powder 600 times, 25% sterilized dan wettable powder 400 times, 50% dysenium 1000 times, 75% chlorothalonil 800 times liquid for the tea garden with serious disease, all have good control effects.

Most of the tea tree pests and diseases in Fuyang City are insect pests, such as leaf-eating pests (tea caterpillars, tea inchworms, tea lily weevils, etc.), juice-absorbing pests (false eye small green leafhoppers, tea orange gall mites, etc.); protection from natural predators; Clear the garden to kill pupae, cultivate soil to kill pupae; Chemical control is carried out when the number of larvae per mu exceeds 4500, and it is appropriate to spray with low-volume canopy before the 3rd instar. The agent can be used 20-25 ml per mu or 20 ml per mu of Uranus.

1. Tea diseases.

1. Tea anthracnose: at the onset of the disease, the edge or tip of the adult and old leaves produces lesions, which are dark green water-stained at first, then turn yellow-brown, and finally become gray-white irregular large plaques, on which there are scattered black fine granules, and the boundary of the diseased part is obvious. The heaviest occurrences occur throughout the year during the rainy season and the autumn rainy season.

Control measures: (1) Strengthen the management of tea gardens, increase the application of phosphorus, potassium fertilizer and organic fertilizer, and avoid partial application of nitrogen fertilizer; Pay attention to ditch drainage. (2) Spraying prevention and control at the stage of 1 bud and 1 leaf in new shoots.

Choose 10% difenoconazole water dispersant 2000 times or 25% prochloraz emulsifiable concentrate 1000-1500 times or 10% polyantimycin wettable powder 1000-1500 times or 80% zeb wettable powder 800 times liquid spray.

2. Tea cake disease: mainly harms young leaves, young shoots and petioles. The young leaves are infected with light yellow or light red near-garden transparent spots at the beginning, and then the front of the lesion is concave, and the back is protruding, forming a blister, which is covered with a layer of gray-white or pink powder, and finally the powder disappears, forming a light brown blighted spot, with a gray white circle on the edge, which is like a cake.

It usually occurs in March-May and September-October.

Prevention and control measures: (1) Strengthen the quarantine of seedlings to prevent the spread of pathogens through the transportation of tea seedlings. (2) Increase the application of phosphorus and potassium fertilizers to improve the disease resistance of tea trees.

3) At the initial stage of the disease, 1000-1500 times of 70% thiophanate-methyl wettable powder or 10% polyantimycin wettable powder 1000-1500 times of liquid spray should be used.

Tea anthracnose, tea moire leaf blight, white silk disease, tea root cancer, tea caterpillar, you should use drugs in a targeted manner, control the concentration of drugs, and also pay attention to the scope of spraying.

Hello, there are the following aspects to prevent and control tea pests and diseases, first of all, to cultivate its species. The insect pests of tea mainly include tea inchworm, tea silkworm, tea caterpillar, tea black poisonous moth, tea white poisonous moth, flat thorn moth, etc., and the main diseases are tea anthracnose, tea moire leaf blight, tea coal disease, tea tree sunburn and so on, we must have an understanding and cognition of these pests and diseases. To prevent and control pests and diseases, it is necessary to ensure that the biological population of the tea garden has a reasonable structure and a certain balance, so that the ecological environment can develop in the direction of a virtuous cycle, create breeding grounds and habitats for the natural enemy population of pests, reduce the total number of pests in the entire tea garden, and maintain balance.

It is necessary to carry out regular inspections in the tea garden, clean up the remaining cuttings and pupal cocoons in the soil in the tea garden, do a good job in closing the park, reduce the entry of pests from the root, prune the diseased branches and leaves in time, take these branches and leaves carrying insect eggs and germs out of the tea garden, and burn them for destruction. It is necessary to do a good job in the fertilization management of tea trees, adopt a reasonable fertilization plan, avoid malnutrition or overnutrition of tea trees, use appropriate fertilizers at the right time, and increase the fertilization rate of phosphorus and potassium fertilizers, so as to improve the resistance of tea trees, so that tea trees have the ability to resist diseases and reduce the probability of infection.

1. Tea aphid.

Harm: Adults and nymphs gather on the back of buds and young leaves, sting and sucking tea liquid, resulting in stunted development of new shoots, weak curling of buds and leaves, and excretion of "honeydew" to induce tobacco mildew, affecting yield and tea quality.

Prevention and control measures: Timely picking in batches can take away the aphid colonies on the young leaves; Hanging yellow plates to trap winged adult aphids; Protect and utilize the natural enemies of aphids in the field, and release aphid cocoons and ladybugs in the initial stage of aphids; When the aphid plant rate reaches 30% and the number of 100 aphids reaches more than 100, it can be sprayed with 300 times of matrine, 300 times of picridine, 300 times of veratrol or 3% azadirachtin 1000 3000 times of liquid for control.

2. Tea leaf leaf-diving fly.

Hazards: The larvae feed on the mesophyll, and the leaves gradually turn yellowish-brown, causing defoliation. Prevention and control measures:

removal of weeds in the field; Manually remove insect leaves, bury or burn them in a centralized manner, and do not throw them away; Place flytrap paper to trap adult insects; protection and use of natural predators, releasing wasps at an early stage of insect infestation; Biological agents such as matrine 300 times, penicillin 300 times, veratroline 300 times or 3% azadirachtin 1000 3000 times were used for control.

3. Small green leafhopper.

Hazards: Adults and nymphs suck tea buds and leaf juice. The leaf margins of damaged buds and leaves turned yellow, the leaf veins turned red, and then the leaf margins and leaf tips shriveled and withered, the growth was stagnant, and the buds and leaves fell off, which seriously affected the yield and quality.

Control measures: batch, multiple picking; Take advantage of the phototaxis of adults to trap with insecticidal lamps during peak periods; Use pheromone trap plates to trap adult insects; Biological agents such as matrine 300 times, penicillin 300 times, veratroline 300 times or 3% azadirachtin 1000 3000 times were used for prevention and control.

4. Tea inchworm.

Hazards: The larvae like to stop at the edge of the leaf and bite the edge of the young leaf, forming reticulated semi-permeable spots. Later larvae often bite the leaves into large, smooth "C" shaped notches.

Control measures: pupation removal in the garden, burying the fallen leaves near the rhizosphere and insect pupae in the topsoil deep in the soil; Insecticidal lamps are set up in the tea garden to trap adults. Use 300 times of the biological agent matrine, 500 1000 times of Ascaris theolithalis nucleopolyhedrovirus or Bacillus thuringiensis, and spray at the age of 1 2 years.

5. Tea mites. Hazards: Mites suck the sap of young tea leaves, the color of buds and leaves turns yellow, the leaves are hard and brittle, thickened, shrunken, wrinkled, slow growth or even stagnate, and the yield decreases. There will be a sharp decrease, and the quality will also decrease.

Control measures: Timely picking in batches can take away a large number of adult mites, eggs, larval mites and nymphs; In the early stage of mite population increase, it can be controlled with 150 200 times solution of 99% mineral oil emulsion, and 150 times solution of 45% stone sulfide crystal can be used in non-picking period. The protection and utilization of natural enemies in the field can release predatory mites in the early stage.

The above are the common pests and diseases and their control methods when planting tea, I hope it will be helpful to everyone.

Pay attention to the type of pests, the balance of organisms, regular cleaning, regular spraying of pesticides, do a good job of daily maintenance and management, pay attention to humidity, pay attention to operation methods, and avoid excessive watering.

It is necessary to water and fertilize in time, and it is necessary to choose the right pesticide according to the crops, and to ensure the fertility of the soil.

It can be prevented with drugs, and special insecticides for tea can be used, which is very effective for the control of pests, so that the tea can grow better and no pests will appear.

1. Anthrax: the main damage to the adult and old leaves, occurs in the rainy period. 2. Tea moire leaf blight:

It is a common and serious leaf disease of tea trees. 3. Tea cake disease: It is a fungal disease, which mainly affects the young shoots of tea trees.

4. Tea black rot: It is a common disease of tea trees, with an incidence rate of up to 52%.

1. Anthrax

Anthrax is one of the four common diseases of tea trees, anthracnose mainly harms the adult leaves and old leaves of tea trees, the lesions mostly spread from the leaf edge or leaf tip, and begin to be water-stained dark green round, and later become black and white, and its onset is in the rainy period.

2. Tea moire leaf blight:

Tea moire leaf blight disease is a common and serious leaf disease of tea trees, the disease is widely distributed, the damaged tea trees have poor growth, new branches are not strong, the buds are thin and weak, etc., which seriously affects the yield of the plant, and the occurrence of this disease requires the rational use of pesticides to avoid pesticide damage.

3. Tea cake disease

Tea cake disease is a fungal disease, which is an important disease in the high mountain tea area, which mainly affects the young shoots and shoots of tea trees, which seriously affects the yield of plants, and the dry tea made in the later stage has a bitter taste, crisp texture and significantly reduced quality.

4. Tea black rot

Tea black rot is a common disease of tea trees, the incidence rate is as high as 52%, if not timely prevention, will reduce the yield of tea trees year after year, and the growth of the plant gradually weakens, and even dies, so in the occurrence of tea black rot needs to be immediately cut off diseased branches, and sprayed with drugs for prevention and control.