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What causes cherry blossoms to drop their leaves early?
The cherry blossoms that should have dropped their leaves in mid-September have dropped them in mid-August for four or five consecutive years, with no pest damage or obvious disease found, and no such phenomenon has appeared in nearby nurseries. What is the reason? Xu Shaoyuan, technical director of Zhejiang Senhe Seed Industry Company, answers: There may be three reasons for early leaf drop in cherry blossoms. First is pest damage. The larvae of longhorn beetles can, under the bark at the base of the trunk, cause the entire branch to drop its leaves early; if the larvae are in the main root, they cause the entire tree to drop its leaves early, so checking for pest damage is very important. Generally speaking, a nitrogen fertilizer content of 3‰ is relatively
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How to manage cherry blossoms in summer? A detailed guide to care methods
1. Mulching with straw to prevent drought. In summer, temperatures are high and evaporation is fast, so the amount of watering is greater than in other seasons, but the principle of "do not water if not dry, and water thoroughly when you do" should still be followed. Cherry blossoms are shallow-rooted plants, and their growing roots are close to the soil surface and dry out easily. Straw can be used to cover the base of the tree, which not only retains moisture and resists drought, but also prevents the cherry tree's fine roots from being washed out and exposed, while greatly reducing evaporation of soil moisture. 2. Wrapping the trunk to prevent drought. Within 2 to 3 years after planting, to prevent the trunk from drying out, it can be wrapped with straw. Because the bark of cherry trees is relatively thin, wrapping the bark can prevent
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Symptoms and Control Methods of White Root Rot in Cherry Blossoms
Symptoms White root rot has become increasingly severe in damaging garden trees in recent years, especially in cherry blossoms. The disease mainly occurs on the roots of trees. After the fibrous roots are infected, it gradually spreads to the lateral roots and the main root. Its characteristic symptom is a layer of grayish-white silky mesh covering the diseased roots; afterward the roots rot, causing the cortex to separate, and the root absorption function is severely lost. In mild cases, the cherry blossom grows poorly and the tree vigor weakens; in severe cases, it causes death. Pathogen and disease pattern The pathogen is Dematophora necatrix Harting, and its sexual stage is the rare Rosellinia necatrix. This fungus also infects many plants such as poplar, willow, ginkgo, paulownia, wintersweet, crabapple, mountain peach, tea, spruce, cedar, flowering almond, tree peony and Chinese peony. The pathogen overwinters as mycelium, rhizomorphs and sclerotia in the soil or in diseased plant residues. White root rot is a soil-borne root disease, and its infection cycle is not obvious. In April-May of the following year, under conditions of abundant rain and moist soil, the rhizomorphs spread and transmit through the soil. The pathogen can invade through wounds and lenticels on young roots. Generally, trees planted in poorly drained, weak-growing and waterlogged low-lying land are more severely affected. In the Beijing area, white root rot occurs severely from July to August; later, small black dots, which are the pathogen's perithecia, grow on the mycelial membrane.
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What are the control methods for the cherry leopard moth borer?
The leopard moth borer, also known as the six-spotted wood leopard moth, belongs to the order Lepidoptera, family Zeuzeridae. Distribution and damage: it is found in Henan, Hebei, Shaanxi, Shandong and other provinces in China. The larvae bore into and feed on the twigs and shoots of many kinds of fruit trees and ornamental trees and shrubs. Damage symptoms: between the xylem and phloem at the base of the affected branch there is a ring-shaped feeding hole, along with a tunnel running from bottom to top. There are several frass-expelling holes on the branch, with large amounts of long oval frass pushed out. The upper part of the affected branch turns yellow and withers, and breaks easily in the wind. Morphological characteristics - adult: female moth body length 20-38 mm, male moth 17-30 mm.
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Occurrence Patterns and Control Methods of Cherry Blossom Pests and Diseases
Cherry blossom belongs to the genus Prunus in the rose family (Rosaceae). It has both the subtle fragrance of plum and the gorgeous beauty of peach, with as many as several hundred cultivars. In recent years, with the demand for landscape gardening, cherry blossoms have been widely used in gardens, adding much beautiful scenery to urban landscapes. However, cherry blossoms suffer from many pests and diseases, mainly the following: 1. Cherry blossom witches' broom disease. The symptom is that many short, thin branches emerge from the affected parts, resembling a bird's nest. On these branches, either no flowers or only a few flowers are produced, and the leaves on the branches are numerous and small. Each year, deformed branches increase at the affected parts.
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Identification and Control Methods for Common Cherry Blossom Diseases and Pests
There are many types of cherry blossom diseases and pests. The common ones are described below: Perforation-type brown spot disease occurs in May and June. Small purplish-brown spots appear on the leaves, then gradually expand into circles. After the diseased spots dry and shrink, they become small holes. The pathogen mostly overwinters on diseased branches and leaves. The optimum temperature for its development is 25°C to 28°C. It spreads by wind. In rainy seasons, infection and disease development are favored. When the tree is weak, drainage is poor, and ventilation and light penetration are poor, the disease occurs severely. Control methods: (1) Strengthen cultivation management, carry out reasonable pruning, and pay attention to cutting off diseased shoots, timely clearing
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Key Technical Points for Seedling Raising and Cultivation Management of Three-Cherry Pepper
I. Seedling Raising Three-Cherry Pepper can be raised in cold frames or small arch sheds, with small arch sheds being the main method. The specific practices are as follows. 1. Construction of the small arch shed The small arch shed is generally 1.5-2 m wide and 1 m high, with straw mats added at night depending on the climate. 2. Preparation of culture soil Use 7-8 parts fertile garden soil and 2-3 parts decomposed barnyard manure, mix well; if the soil is clayey, also mix in sandy soil. 3. Sowing time Spring sowing for seedling raising is generally arranged in mid-to-late February, and at the latest should not exceed March 5. Summer sowing is generally in mid-March,
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Detailed Explanation of the Key Cultivation and Management Techniques for Three-Cherry Chili
I. Raising Seedlings Three-Cherry Chili can be raised in cold frames or small arch sheds, with small arch sheds being the main method. The specific practices are as follows. 1. Construction of the small arch shed The small arch shed is generally 1.5--2 m wide and 1 m high, with straw mats added at night depending on the climate. 2. Preparation of the growing soil Use 7--8 parts fertile garden soil and 2--3 parts decomposed barnyard manure, mix well; if the soil is sticky and heavy, also mix in sandy soil. 3. Sowing time Spring-sown seedlings are generally scheduled for mid-to-late February, and no later than March 5. Summer sowing
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Key Technical Points for the Cultivation and Field Management of Three-Cherry Pepper
I. Seedling Raising Three-Cherry Pepper can be raised in sunken hotbeds or small arch sheds, with small arch sheds being the main method. The specific practices are as follows. 1. Construction of the small arch shed The small arch shed is generally 1.5-2 m wide and 1 m high, and straw mats are added at night depending on the climate. 2. Preparation of the growing soil Use 7-8 parts fertile garden soil and 2-3 parts decomposed barnyard manure, mix well; if the soil is heavy and clayey, also mix in sandy soil. 3. Sowing time Spring-sown seedlings are generally arranged in mid-to-late February, and no later than March
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Symptoms and Control Methods of Spruce-Bird Cherry Cone Rust
Spruce-bird cherry cone rust occurs in Inner Mongolia, Jilin, Heilongjiang, Sichuan, Yunnan, Tibet, Shaanxi, Gansu, Qinghai, ** and other places in China. The disease affects Picea asperata, Picea purpurea, Picea likiangensis, Picea brachytyla var. complanata, Picea jezoensis, Picea schrenkiana, ** spruce, etc. Symptoms: The disease affects the upper surface of the scales of female cones. Infected scales are twisted, recurved and disorganized. On the upper surface, many small purple-brown spherical bodies are produced in a single layer; these are the aeciospore-bearing structures (aecia) of the pathogen, and sometimes aecia are also produced on the lower surface of the scales. Pathogen: The pathogen is Thekospora areolata (Fr.) Magn.
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