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How to prevent and control frost damage to young and newly planted tea trees? These seven methods must be mastered
1. Apply winter manure. Young and newly planted tea trees have relatively weak cold resistance, so before overwintering, a heavy application of winter manure should be combined with earthing up and mounding around the base. The fertilizer should mainly be farmyard manure, stable manure and biogas residue, which have a certain heat-preserving effect, along with a certain amount of cake fertilizer, superphosphate and potassium sulfate fertilizer. Winter manure can not only preserve heat and prevent freezing and enhance the tea trees' freeze resistance, but also lay a good foundation for the tea trees' growth the following year. 2. Earth up and mound around the base. Preventing the root crown from freezing is a key measure for protecting young and newly planted tea trees from frost. Therefore, before young and newly planted tea trees overwinter, they should
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Occurrence Patterns and Control Methods of Major Tea Plant Pests During the Summer Tea Season
Due to the low-temperature rain and snow weather last winter and this spring, the overwintering generation of tea pests this year had a low population base and a delayed occurrence period, and damage during the spring tea season was relatively light. However, summer weather is more suitable for the occurrence and damage of pests and diseases, so monitoring and control work must be carried out effectively. The occurrence level of the camellia spiny whitefly was lighter than last year, but pest numbers in some tea gardens still exceeded the control threshold. According to a survey by the Songyang County Plant Protection Station: the peak period of overwintering adult camellia spiny whiteflies was April 15, with an average of 17.4 insects per 100 leaves, later and fewer than last year (April 5).
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Symptoms and Control Methods of Tea Tree Crown Gall
Symptoms It occurs in Anhui, Zhejiang, Guangdong and other provinces. It mainly damages the roots. When the main root and lateral roots are infected, light brown spherical small protrusions first appear on the diseased part, then expand into tumor-like growths, small ones resembling grains of rice, large ones resembling broad beans, and multiple small tumors gather together into large tumors. In the later stage, the diseased tumors turn brown and become lignified, with a rough surface and hard texture. When cuttings and seedlings are infected, they have few fibrous roots or fail to develop roots, causing the seedlings and plants to become weak or the leaves to turn yellow and fall off, and the plants die. Pathogen Agrobacterium tumefaciens
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What are the control methods for several tea plant diseases?
I. Tea leaf blight (tea gray blight) Tea gray blight is a common and serious leaf disease of tea plants. The disease is widely distributed throughout tea-growing areas. Affected plants often grow poorly, with weak new growth, thin and weak buds, and premature aging, seriously affecting yield. Control methods for this disease: 1. Strengthen management and cultivate healthy tea plants. Use pesticides rationally to avoid phytotoxicity; carry out timely intertillage and weeding to loosen the soil; do a good job of tea garden drainage or drought and cold resistance work, create an environment favorable to tea plant growth, promote tea plant vigor, and improve resistance.
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Detailed Guide to the Control Methods of the Tea Green Leafhopper (Empoasca onukii)
The tea green leafhopper (Empoasca onukii), commonly known as "fuchenzi," is one of the major pests on tea plants in all tea-producing regions of our province. Damage from this pest ranges from minor harm to buds and leaves with reduced yields, to severe destruction of buds and leaves resulting in total crop loss. I. Morphological Characteristics The tea green leafhopper belongs to the order Homoptera, family Cicadellidae. Its life cycle passes through three stages: egg → nymph → adult. 1. Egg: crescent-shaped, about 0.8 mm long and about 0.15 mm wide, initially milky white, gradually turning pale green; before hatching, a pair of red eye spots is visible through the front end. 2. Nymph: 5
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Control Methods for Major Diseases of Tea Plant Young Shoots and Stems
To effectively control tea plant pests and diseases, reduce pesticide residues in tea, and improve tea quality, the major diseases of tea plants and their control are described below. I. Damage Symptoms 1. Tea bud blight: After the tea plant is infected, the growth of buds and shoots is obviously inhibited, affecting the yield and quality of spring tea. It mainly damages the first 1 to 3 leaves of the spring tea flush, first producing pale yellow or yellow-brown lesions at the leaf tip or leaf margin, which after expansion become irregular in shape, with the boundary between diseased and healthy tissue distinct or indistinct; the bud tip is damaged and becomes dark brown and scorched, shriveled and unable to extend; later
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Control methods for diseases, pests and weeds during the cotton sowing period and seedling stage
This year, affected by abnormal climate, the cotton sowing time in our province was delayed. Under this continuous low-temperature condition, cotton growth and development were delayed, and the degree of disease and pest damage was relatively aggravated. For this reason, the situation facing cotton disease and pest control this year is more severe. From the start of sowing, every key control technique must be firmly implemented, especially the links in pesticide selection and use. The main disease and pest control techniques for the sowing period and seedling stage are introduced to the broad community of farmers as follows: 1. Strictly control the seed treatment with pesticides at the sowing stage. Before cotton sowing, focus on
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Control Methods for Premature Senescence in the Late Growth Stage of Cotton
The internal cause of late-stage premature senescence in cotton is that after cotton growth enters August, intense competition for nutrients arises among the roots, stems, leaves, and bolls, leading to an imbalance between nutrient supply and demand; the external causes are insufficient water and fertilizer in the cotton field during the late stage, such as phosphorus or potassium deficiency; in some cotton fields, it is also because of too many pesticide sprayings in the late stage, or excessive pesticide concentration, which causes serious damage to cotton leaves. It should be pointed out that the fundamental measure to prevent premature senescence in cotton is to start with strengthening the basic construction of the cotton field, that is,
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How to prevent and control cotton seedling stunting? These methods are worth trying
After cotton is transplanted, it is right in the plum rain season, with low temperatures, many rainy days, and little sunlight, which causes the cotton seedlings to turn green slowly, delays flower bud differentiation, and forms the "stunted seedling" phenomenon. The main types of stunted seedlings are: first, waterlogging-induced stunted seedlings. Commonly seen in low-lying cotton field sections, prolonged overcast and rainy weather causes waterlogging-induced stunted seedlings, leading to blackened roots, grayish-green leaves, and slow growth. Second, drought-induced stunted seedlings. Mainly due to drought, the leaves turn yellow and dry red, there are few new roots, growth is extremely slow, and the proportion of red stems is large. Third, fertilizer-induced stunted seedlings. The main reason is that the base fertilizer is applied too shallowly
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What causes stunted cotton seedlings? A detailed explanation of prevention and control methods
During the transplanting period, cotton is often affected by abnormal weather, weak seedlings, inadequate cultivation measures and other factors, which cause a long slow-seedling period and stunted growth after transplanting, delaying the cotton's growth process and reducing cotton yield. The causes of stunted cotton seedlings and their prevention and control are described below: 1. Causes. 1. Poor cotton seedling quality. ① Insufficient fertilization of the seedbed produces small, weak seedlings with poor growth vigor that establish slowly. ② Improper seedbed management produces leggy seedlings or overgrown seedlings, which lose too much water after transplanting and suffer severe transplanting injury. 2. Unsuitable temperature. In many places
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