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Control Methods for Spider Mite Damage on Cherry Blossoms
How to control the damage caused by spider mites to cherry blossoms? The spider mites that harm cherry blossoms are mostly hawthorn spider mites, also known as hawthorn red spider mites. Spider mites mainly damage cherry blossom leaves. In early spring, the adults and nymphs gather on the undersides of leaves, piercing their mouthparts into the leaf tissue to suck sap, causing the damaged leaves to show chlorotic spots; in severe cases, the leaves scorch and drop early. The female adult of the hawthorn spider mite is 0.5 mm long, oval in shape, with a total of 26 setae on its back. The body is red, with winter and summer forms: the winter form is bright red with a silky sheen; the summer form is red when molting, and after feeding
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What are the control methods for cherry root cancer?
How to control cherry root cancer? The tumor at the root crown of cherry is caused by a bacterium of the genus Agrobacterium, known as cherry root cancer. The most obvious symptom of this disease is the formation of spherical or hemispherical tumors at the root crown. In the early stage, the tumors are white and soft, then gradually enlarge and become lignified. The surface of the diseased tumors is rough, brown or dark brown. Cherry root cancer often causes poor growth of the aboveground part of the plant, yellowing of leaves, and in severe cases, plant death. The pathogenic bacteria of cherry root cancer survive and overwinter in the surface layer of the tumors of diseased plants and in the soil. When the surface layer of the tumors is decomposed
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What are the control methods for cherry root gall disease?
The gorgeous cherry blossom is deeply loved by people, but it is prone to a deadly root gall disease. This disease mainly occurs on the roots and on the trunk and side branches of the aboveground part of the cherry tree. In the early stage of the disease, the root crown swells into spherical or hemispherical tumor-like growths; young galls are white, soft in texture, and smooth on the surface. Later the galls gradually enlarge, become hard in texture, brown or dark brown, with a rough, cracked surface, and spread gradually from the root crown to the main root, lateral roots, and even fibrous roots, with each node swelling into tumors of varying sizes, causing the cherry tree to grow slowly or even stop growing, and the whole tree dies within 3 to 5 years
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What are the control methods for trunk-boring pests of cherry blossoms?
The longhorn beetles that harm cherry blossoms usually include the star longhorn beetle, the glossy-shouldered star longhorn beetle, and the peach red-necked longhorn beetle. 1. The star longhorn beetle has 1 generation per year. When adults emerge from late May to early June, capture the adults: before the star longhorn beetle adult lays eggs, it first bites a notch about 2 mm deep and about 8 mm long in the bark in the shape of a "" or "", and then lays eggs inside it. During the peak egg-laying period in mid-to-late July, search for the notches on the trunk and destroy the eggs. During the stage when newly hatched larvae are active in the cortex, use a grafting knife to pick the larvae out. For larvae that have bored into the xylem, it is necessary to
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What are the control methods for the main pest mites of Sichuan cherry blossoms?
In the Mianyang area of Sichuan, the mites harmful to cherry blossoms are mainly the European red mite (Panonychus ulmi), the hawthorn spider mite (Tetranychus viennensis), and others. The larvae, nymphs and adult mites suck the leaf sap; the damaged leaves develop many small chlorotic spots, and in severe cases the leaves turn pale and scorch, which not only affects plant growth and flowering but also affects photosynthesis. Morphological characteristics: the female adult of the European red mite is 0.45 mm long and 0.29 mm wide, round, with a raised back, dark red; the male adult is 0.3 mm long. Summer eggs are orange-red, winter eggs dark red.
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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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What are the control methods for Geranium leaf spot disease?
Symptoms mainly affect the leaves. Initially, small water-soaked spots appear, which later become circular, 2-3 mm in diameter, slightly sunken in the center, with a small brown center and a yellow spreading margin around it. Old lesions can reach 6-10 mm in diameter and, restricted by leaf veins, become irregular in shape, dark brown, with concentric rings, and bear a sparse pale black mold layer on the surface. When there are many lesions on a leaf, they can merge with each other, often causing the leaf to turn black, shrivel and die. The disease conditions mainly occur on older, weakened tissue, so it is most often seen first on the lower old leaves. Rainy weather, excessive
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