What are the main common leaf eating pests of tea trees?

1.Inchworm. Kind. In general, the larvae are identified by two pairs of gastropods that arch their dorsal arches when crawling. The main species are the tea inchworm and the tung inchworm.

Tea inchworm: commonly known as arch insect, it is distributed in Anhui, Jiangsu, Zhejiang, Jiangxi, Fujian, Sichuan and other tea areas, among which Anhui, Jiangsu, Zhejiang and other tea areas are more occurring. The larvae will bite the leaves of the tea plant, and the specific damage at each instar stage is different

At the first instar, it bites on the epidermis and mesophyll of young leaves, and appears as small brown concave spots; The second instar bites the leaf margin, forming a missing leaf; After the 3rd instar bites, the main vein will be left; After 4 years of instar, even the petioles and even the branches are eaten together; When the insect pest is serious, the branches of the tea tree are bare, the shape is like a fire, and the tree is weakened, resulting in a decrease in the yield of summer and autumn tea. In addition to harming tea trees, it also harms soybeans, sesame, cowpeas, sunflowers, etc.

Tung inchworm: also known as the large inchworm. It is distributed in most tea areas in the country, and the occurrence is more severe in the southern tea area.

The larvae bite the leaves, and when they are overeating, they can eat up the leaves and young stems, so that the tea garden forms a light pole. In addition to harming tea trees, it also harms plants such as tung oil, bayberry, hickory, and pear.

2.Poison moths. The larvae are characterized by venomous hairs on the body surface, touching **, red, swollen, itchy and painful. The main species are tea caterpillar and tea black poison moth.

Tea caterpillar: also known as tea yellow poison moth, poisonous caterpillar. It is distributed in most tea areas across the country.

Pre-3 instar larvae often gather in groups of dozens to hundreds on the dorsal surface of the leaves to feed, causing the infested leaves to form yellow-green, translucent film-like spots, and then to form scorched spots. After the 3rd instar, the larvae bite the leaves inward from the leaf tip or leaf margin, forming leaf defects. In severe cases, even new shoots, branches and branches can be eaten.

Moreover, the insect body has poisonous hairs, which will be red, swollen and itchy when it touches the human body, affecting tea picking and other tea garden farming activities. In addition to harming tea trees, it also harms plants such as camellia, camellia, citrus, tung oil, and pear.

Tea black poison moth: also known as tea mushroom poison moth. It is mainly distributed in Zhejiang, Guizhou, Anhui, Taiwan and other tea areas. The larvae bite the leaves, and when the insect infestation is severe, even the new shoots will be eaten together. In addition to harming tea trees, it also harms plants such as Camellia oleifera.

Tea small green leafhopper, tea tarsal mites, tea gall mites, tea short whisker mites, coffee small claw mites, tea aphids are all pests often encountered by tea trees.

Tung inchworm, tea black poison moth, tea inchworm, tea caterpillar, these kinds of very common, these animals like to eat tea.

There are mainly inchworms and poisonous moths, which are two. Therefore, we must spray pesticides in time to clean up pests.

1.Tea red star disease. It mainly occurs in the young leaves and new shoots of the tea tree.

Initially brown pin-like dots, gradually expanding to brown or purple spots, dark brown edges, **concave, grayish-brown; On the same leaf, multiple lesions can be connected to form irregular large spots; It can also damage the petiole and cause the leaf to fall off; When the humidity is high, gray mold is produced on the front of the lesion**. Red star disease is a low-temperature and high-humidity disease, which occurs seriously in the rainy season of spring and autumn. Where the sunshine is short, the damp fog is heavier; Extensive management of tea gardens, insufficient fertilizers, excessive picking, tea seedlings with weak growth or soft growth of tea plants are prone to disease.

2.Moire leaf blight. The disease mostly occurs from the tip of the leaf or the leaf margin, brown, semicircular or irregularly shaped, wavy whorl, like moire, and the gray-black flat small grain spots on the later lesions.

The disease is a disease of high temperature and humidity, and the peak period of the disease is from late August to early September. High groundwater level, poor drainage, insufficient fertilizer or frost or drought damage to tea trees or direct sunlight in summer, uneven moisture, resulting in sunburn spots are prone to this disease.

3.Rotular-spot disease. It mainly harms adult leaves and old leaves.

It often begins at the tip or margin of the leaf, and gradually expands into round to oval or irregular large brown lesions, with obvious concentric whorls on the adult and old leaves. When the young leaves are infected, there are no whorls on the lesions. Tea wheel spot disease is a fungus caused by the disease, high temperature and humidity are conducive to the occurrence of this disease, generally in summer and autumn.

Poor drainage, cuttings nursery or densely planted tea plantation, prone to disease when humidity is high.

4.Anthrax. It mainly occurs on the adult leaves of tea plants, and occasionally occurs on old leaves and young leaves.

The lesions mostly occur from the leaf edge or leaf tip, and the initial lesions are dark green and water-stained, spreading and expanding along the leaf veins, turning brown or reddish-brown, and turning gray-white in the later stage. The front of the lesion may have many black, fine protruding spots. Tea anthracnose is a fungal disease that generally invades at the young leaf stage and symptoms only appear at the leaf-growing stage.

At the turn of spring and summer and autumn, there is more rain, and the occurrence of tea anthracnose is more serious; In summer, due to high temperatures and frequent drought and little rain, it is not conducive to the occurrence of anthrax.

The main pest species of tea trees: leafhoppers, including small green leafhoppers and false eye small green leafhoppers, occur in all tea regions of the country. There are tea orange gall moths, which occur in all tea areas across the country; The occurrence of tea tarsal mites was serious in the southwest tea area and the local area of the Jiangnan tea area. Tea short-bearded mites occur in local tea gardens in the Jiangnan tea area.

Blackthorn whitefly occurred more severely in the Jiangnan tea area and the South China tea area. There are horned wax scales and tea oyster scales, which are common in the southwest tea area. The long white scale and the coconut scale occur in the Jiangnan tea area. Thrips (Yellow thrips) are one of the main pests in the tea areas of South China and Southwest China.

Poisonous moths have tea caterpillars, which occur in all old tea areas; Tea black poison moth occurs seriously in Zhejiang and other provinces. Inchworms include Tung oil, which occurs in tea areas such as South China, Southwest China, and Jiangnan. The occurrence of tea inchworm occurred in the tea area of the south of the Yangtze River, and the damage of the cloud inchworm was serious in the southwest tea area. Leaf-curling moths, including tea leaf-curling moths and tea leaf-curling moths.

The former is more severe in the Jiangnan tea area; The latter occurs more heavily in the southern tea region. Weevil, mainly tea weevil. There are also spiny moths, demoiselle moths, aphids, dry-boring pests (tea moths, etc.), underground pests (grubs, large crickets, termites, etc.).

The canopy of tea trees is dense and lush, and the microclimate change is small, which is conducive to the survival of pests and diseases, and at the same time, there are abundant natural enemy resources to restrict the growth of pest and disease populations, and the species of pests and diseases are relatively stable. With the reform of cultivation technology, the ecological environment of tea plantations has changed. For example, the planting method of tea plantations is changed to cluster planting to strip planting, which is conducive to the spread of pests and diseases; Increasing fertilizer and lush growth of new shoots are conducive to the occurrence of a variety of bud and leaf diseases and pests; The extensive use of pesticides has weakened the natural control of natural enemies over pests, resulting in more aggressive pests and secondary pests becoming major pests.

Therefore, the prevention and control of tea tree diseases and insect pests can not rely solely on pesticide control, should strengthen the management of tea gardens, on the basis of directional changes in environmental conditions, give full play to the natural control role of natural enemies, coordinate various prevention and control measures, and use pesticides rationally when necessary. Only through integrated management can the development of tea tree diseases and pests be controlled.

At present, most of the tea tree pests and diseases are insect pests, such as leaf-eating pests (tea caterpillars, tea inchworms), juice-absorbing pests (false eye small green leafhoppers, tea gall mites), etc.

1. Tea caterpillars: larvae cluster before 3rd instar, and adults have phototaxis. The young larvae mostly inhabit the back of the middle and lower adult leaves of the tea tree, feed on the lower epidermis and mesophyll, eat into holes or missing carvings after the second instar, and enter the gluttony period after the fourth instar.

2. Tea inchworm: also known as arch insect, it eats tea leaves with larvae, and forms dead spots or missing carvings after the instar larvae are infested, and eats the whole leaf after the 3rd instar, and can make a piece of tea garden bald when it occurs.

3. False eye small green leafhopper: also known as leaf jumping insect, it pierces the young shoots and leaf veins of tea trees with needle-like mouthparts to absorb the juice, causing the buds and leaves to lose water and shrink, and scorch, which seriously affects the yield and quality of tea. The insect has been the main pest in recent years.

4. Tea gall mites: also known as tea thorn leaf gall mites, absorb the sap of tea trees, make the damaged buds and leaves lose their luster, the leaf veins are red, and the leaves roll upwards and shrink, causing the buds and leaves to dry up and have brown rust spots on the back of the leaves, which affects the yield and quality of tea.

5. Tea anthracnose: mainly harmful to adult leaves and old leaves. The lesions are mostly from the leaf edge or leaf tip, and there are many small, black protruding grains on the lesions, without wheel lines. It usually occurs in rainy years, but it is also more likely to occur in tea plantations with partial nitrogen fertilization.

Tea tree pests will have a great adverse effect on the normal growth of tea plants and reduce the quality of tea. Tea tree pests mainly include: sap sucking.

The main pests are false eye small green leafhopper, tea aphid, white scale, black thorn powder, green blind bug, snake eye, etc.; Leaf-eating species. The main pests are tea inchworms, tea silkworms, and tea hairs? x, tea white poison moth, tea black poison moth, flat thorn moth tea, etc.; Drill moths.

The main pests are tea branch sickle moth, tea beetle, tea branch wood moth and so on; Underground pests. Pests mainly include large crickets, grubs, etc.

At present, there are more than 40 kinds of tea tree diseases, which have a great impact on the normal growth of tea trees. The main tea tree diseases are as follows: leaf diseases.

It mainly includes tea anthracnose, tea moire leaf blight, tea coal disease, and tea tree sunburn; Diseases of the branches. Mainly including lichen, tea plaster, dodder seed, etc.; Root diseases. It mainly includes tea seedling white silk disease, tea tree root rot, tea seedling root-knot nematode disease, etc.

The common diseases of tea are tea cake disease, leaf blight, wheel spot disease, anthracnose, brown leaf spot, coal disease, red leaf spot, white star disease, white silk disease, root rot, red star disease and so on. Common insect pests of tea include tea small green leafhopper, tea gall mites, tea tarsal mites, root-knot nematodes and so on. When cultivating tea trees, it is recommended to keep them ventilated and always pay attention to insect and disease prevention.

Leafhoppers, including small green leafhoppers and pseudo-eyed small green leafhoppers. Mites include tea orange gall mites. Blackthorn whitefly scales include horned wax scales and tea oyster scales.

Thrips poisonous moths include tea caterpillars and tea black poisonous moths. Inchworms include the Leaf-Curling Moth, including the Tea Leaf-Rolling Moth and the Tea Leaf-Curling Moth. Weevils, such as the tea weevil, etc.

Stinging moths, moths, aphids, stem borers, tea moths, etc., underground pests: grubs, termites, etc.