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Control Methods and Techniques for Leaf Spot Disease in Japanese Euonymus
Japanese euonymus (Euonymus japonicus) is a commonly used evergreen ornamental small shrub in landscaping, with many advantages, but the occurrence of leaf spot disease causes premature leaf drop, resulting in bare branches and even death, seriously affecting the normal growth and ornamental effect of Japanese euonymus. 1. Symptoms: In the early stage of the disease, small yellow spots appear on the leaves, gradually turning yellow-brown, expanding into circular or irregular spots, with a lesion diameter of 2 mm to 10 mm. In the later stage, the lesions become gray-brown or gray-white with darker edges, and many small black dots form on the lesions. In severe cases, the lesions merge into one piece,
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Control Methods for the Pryeria sinica Moth on the Ornamental Landscape Tree Euonymus japonicus
Distribution and Damage The Pryeria sinica Moore, also known as the Euonymus japonicus long-haired moth and the Euonymus japonicus moth, belongs to the order Lepidoptera, family Zygaenidae. It is distributed in Shanghai, Nanjing, Wuxi, Suzhou, Hangzhou, Wuhan, Lianyungang and Hefei, among other places. It damages Euonymus japonicus, silver-edged Euonymus japonicus, golden-heart Euonymus japonicus, Euonymus grandiflorus, Euonymus fortunei and Euonymus bungeanus, among others. The larvae feed on the host leaves, and when the infestation is severe they eat all the leaves, affecting the normal growth of the plants. Morphological characteristics The adult is flat and round, with a black body dorsum and thoracic dorsum
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How to control the box tree moth? Pest control methods for garden ornamental trees
Distribution and damage The box tree moth Diaphania perspectalis Walker, also known as the boxwood black-edged pyralid moth, belongs to the order Lepidoptera, family Pyralidae. It is distributed nationwide. The larvae damage large-leaved boxwood, boxwood (Buxus sinica), Lushan boxwood, common boxwood, Korean boxwood, Japanese boxwood, holly and Euonymus, etc. This pest occurs suddenly; in mild cases it affects normal growth, and in severe cases the leaves wither and drop, leaving bare branches and causing young plants to die. Morphological characteristics The adult is about 23 mm long, with a wingspan of about 48 mm. Apart from the dark brown broad bands on the costal, outer and inner margins of the forewings and the outer margin of the hindwings
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What are the control methods for gray leaf spot on Japanese euonymus (Euonymus japonicus)?
Control methods for gray leaf spot on Japanese euonymus: 1. Strengthen plant quarantine and use healthy seedlings. 2. Strengthen tending and management, cultivate strong seedlings, and enhance the disease resistance of the plants. 3. In autumn, winter and early spring, thoroughly remove diseased leaves and fallen diseased leaves, and burn them in a centralized manner to reduce the source of infection. 4. In the early stage of the disease, spray the plants once every 20 days with a 200-fold dilution of non-toxic high-fat film, for 3 to 4 consecutive sprays. 5. During the epidemic period of the disease, spray a 500- to 1000-fold dilution of 50% carbendazim or 75% chlorothalonil, used alternately, for 4 to 5 consecutive sprays.
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What are the control methods for anthracnose in large-leaf boxwood (Euonymus japonicus)?
Methods for controlling anthracnose in large-leaf boxwood: 1. In autumn and winter, collect diseased branches and fallen leaves and burn them in a centralized manner to reduce the source of the disease. 2. At the early stage of the disease, promptly apply 75% chlorothalonil wettable powder at 500 times dilution, or 50% thiram wettable powder at 500 times dilution, or a 1:1:160 Bordeaux mixture, or 50% Tuzet wettable powder at 800 times dilution.
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Control Methods for Iron Deficiency Chlorosis in Azaleas
Azalea iron deficiency chlorosis, also known as yellow leaf disease or chlorosis, is a common disease of potted azaleas in various regions. Symptoms: This disease mostly occurs on young leaves of new shoots. In the early stage, the mesophyll between the veins loses its green color and luster, then gradually turns yellow-white, but the veins remain green, making the green on the leaves appear in a net-like pattern. Subsequently, the degree of yellowing gradually intensifies, and except for the larger veins, the entire leaf turns yellow or yellow-white. In severe cases, the leaf tips and leaf margins wither and scorch inward. Causes: Azalea iron deficiency chlorosis is a physiological disease
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Symptoms and Control Methods of Azalea Gall Disease
Symptoms: It can harm the young branches, shoot tips and leaves of azaleas. After the leaves are affected, the edges or the entire leaf become swollen and thickened, forming tumor-like or hemispherical fleshy galls. After young branches are affected, they also swell and thicken into fleshy galls, affecting new shoot growth. After flowers are affected, a white powdery mold layer, namely the fungal hymenium, grows on the petal surface or in depressions. In the later stage, the galls turn brown, wither and fall off. Pathogen and current disease situation: Pathogen: Exobasidium hemisphaericum Shirai, Basidiomycota, Hymenomycetes, Exobasidiales.
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Identification and Control Methods for Common Rhododendron Diseases
The main diseases of rhododendrons include root rot, brown spot, black spot, leaf blight, and iron-deficiency chlorosis. After a rhododendron suffers from root rot, its growth weakens, the leaves wilt and dry up, and water-soaked brown patches appear on the root surface; in severe cases, soft rot develops, and the roots gradually rot and peel, with the xylem turning black. This disease is most likely to occur under conditions of high temperature and high humidity. The control method is to strictly disinfect the potting soil before repotting, and to keep the soil loose and moist with good permeability, avoiding waterlogging. If an affected plant is found, deal with it promptly.
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What are the common pests of azaleas? Detailed explanation of control methods
The common pests of azaleas include: red spider mites, lace bugs, aphids, short-bearded mites, etc. Red spider mites are tiny in size but cause severe damage to azaleas. This type of pest is most likely to appear when azaleas are grown in high-rise buildings. The control method is manual capture and killing. For chemical pest control, a 5-degree lime-sulfur mixture can be sprayed, or equal parts of walnut leaves, oleander leaves and sweet wormwood can be crushed and soaked to extract the liquid, diluted with water and then sprayed. Spraying with a 1000-fold water dilution of dichlorvos is also a good method. The adult lace bug is small and flat, about 4 mm long, black, and is harmful to evergreen
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A Detailed Guide to Rhododendron Cultivation Techniques and Pest and Disease Control Methods
Rhododendron, also known as yingshanhong, yangjiaohua, yangzhizhu, hongzhizhu, and hongzhizhu, is a semi-evergreen, evergreen deciduous shrub or evergreen small tree of the genus Rhododendron in the family Ericaceae. Flower types include single, semi-double, and double, with the corolla mostly red, in various shades such as bright red, pink, peach red, vermilion, purple red, and yellow; there are also pure white, golden yellow, pale yellow, and violet colors, or mixed with spots and stripes. There are about 800 species in the same genus, most of which are native to China. It is a traditional famous flower of our country and one of China's "Top Ten Famous Flowers." It is a city
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