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How to prevent and control leaf spot disease in Chinese privet (Ligustrum quihoui)?
Ligustrum quihoui, a plant of the genus Ligustrum in the family Oleaceae, is an excellent colored shrub that has been widely planted in recent years. However, as the planting area has expanded and the planting years have increased, some of its shortcomings have gradually emerged. Especially with old seedlings, during the rainy season every year, leaf drop of varying degrees occurs, and it happens year after year, seriously affecting the landscape effect. According to observation, the cause of this condition is golden privet leaf spot disease. Through preliminary observation and research, the pathogen of Ligustrum quihoui leaf spot disease belongs to the subphylum Deuteromycotina fungi. Round
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What plant is Japanese golden-leaf privet (Ligustrum sinense 'Variegatum', also known as Golden Privet)?
Characteristics: Also known as Howardi privet, it is a plant variety in the genus Ligustrum of the family Oleaceae. It is an evergreen small tree with greenish drooping branches bearing white spots. The leaves are opposite, simple, ovate; the young leaves are golden yellow, and the leaves are thick and leathery with a bright luster, with ornamental value clearly superior to yellow-leaved varieties such as golden-leaf privet and golden-leaf boxwood. It has good resistance, tolerates cold and high temperatures, and has strong adaptability. It bears panicle inflorescences with white flowers. The fruit is dark purple and elliptical. It is suitable for cultivation in East China, South China, Central China and other regions. Suitable for color blocks, hedges and spherical
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Symptoms and Control Methods of Privet Leaf Rust
Privet, also known as wintergreen and wax insect tree, is an evergreen small tree native to China and Japan. It likes light and tolerates slight shade, prefers warm and humid conditions, is suitable for slightly alkaline soil, is slightly cold-resistant, and has strong resistance to air pollution. Privet is a commonly used landscaping tree in courtyards and can be used as hedges and courtyard landscaping trees. Symptoms: Round brown spots appear on the surface of infected leaves and gradually become sunken, while the corresponding parts on the back of the leaves bulge. The mesophyll of the diseased area thickens and turns yellow or purplish red, after which many cup-shaped rust spore receptacles grow on the raised spots. Rust spores
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What pathogen causes privet leaf spot?
The pathogen of privet leaf spot is: Phyllosticta ligustri, a fungus of the Deuteromycotina. The pycnidia form on the leaf surface, initially immersed, scattered or clustered, later breaking through the epidermis and becoming exposed, lens-shaped, measuring 72 to 88 microns. The conidia are nearly oblong, single-celled and colorless, containing 2 oil droplets, measuring 5 to 7 by 2.5 to 3 (microns).
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Symptoms and Control Methods of Cotton Leaf Blight
Symptoms Also known as cotton Cercospora leaf spot. It mainly damages leaves. Infection usually occurs in the late growth stage of cotton. At first, many dark red small spots appear on the leaves, then expand into nearly round lesions with purplish red, slightly raised edges and brown centers. Under moist conditions, a white mold layer forms, which is the pathogen's conidiophores and conidia. Affected leaves break very easily. Pathogen Mycosphaerella gossypina (Cooke) Earle, called cotton ball fungus, belongs to the Ascomycota fungi. The ascocarp is spherical and black, and the ascospores
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What are the control methods for cotton red leaf disease?
Cotton red leaf disease is a physiological disorder that has a relatively large impact on cotton yield and quality. This disease usually begins to occur at the early flowering stage. If control is not timely, by the full flowering stage to the boll-setting stage the affected area expands and the condition worsens. When the disease first appears, the leaves take on a dark green color, then gradually thicken and wrinkle, becoming brittle, with yellow spots appearing between the veins while the veins remain green. As the disease worsens, the leaf edges begin to curl downward and turn from yellow to purplish red, withering and dropping off, until the cotton plant is left as bare stalks and dies. The main causes of cotton red leaf disease
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Causes of Leaf Drop in Bonsai Ficus in Northern Cultivation and Preventive Measures
Ficus (Ficus microcarpa L.) is an evergreen ornamental plant of the Moraceae family, generally grown as bonsai in the north. Its leaves are bright green, its branches and trunk are vigorous and rugged, and its forms are endlessly varied; the coiled and twisting aerial roots in particular give a sense of antiquity, desolation and richness. It is an excellent bonsai plant. However, bonsai ficus grown in the north always drops its leaves, seriously affecting its ornamental effect. The author has investigated this for many years, analyzed the causes, and summarized preventive methods. 1 Causes of leaf drop Leaf drop of bonsai ficus in the north can be divided into two
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Red-leaf privet is a common landscaping nursery stock variety
Red-leaf privet is a horticultural cultivar of the genus Ligustrum in the family Oleaceae. It is an evergreen small tree with opposite simple leaves; the branchlets are slightly covered with fine hairs, and the leaves are ovate, ovate-round to ovate-elliptic, thin leathery, extremely similar in leaf shape to Chinese privet (Ligustrum sinense), with stronger sprouting ability, faster growth and vigorous growth. Its new shoots and young leaves are purplish red, and against the backdrop of the old leaves they appear all the more vivid and dazzling. After being pruned several times, the new branches become dense and the whole crown turns purplish red, making it even more gorgeous and striking among green plant clusters. After winter sets in, the whole plant turns purplish black again, standing out even more among all things. Red-leaf privet
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Privet is an evergreen broadleaf tree species with strong resistance to pollution.
Privet is an evergreen tree of the genus Ligustrum in the olive family (Oleaceae). 1. Habits: Privet is native to China and Japan. It is light-demanding but tolerant of shade, prefers a warm, humid climate, and is suited to slightly acidic to slightly alkaline or calcareous soils. It can also grow in clayey soil with a salt content of 0.2%, can withstand low temperatures of -12°C, and is not tolerant of poor, thin soils. It is deep-rooted with well-developed fibrous roots, grows quickly, has strong sprouting ability, and tolerates pruning. It is not strict about climate, but is best planted in humid, sheltered, sunny spots, and grows especially well in deep, fertile soil rich in humus.
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How to treat oleander leaf spot? Detailed methods for disease control in medicinal plants
Oleander, scientific name Nerium indicum Mill., is a woody plant of the family Apocynaceae. Its leaves and flowers are used as medicine; it is toxic. It has the effects of strengthening the heart and promoting diuresis, eliminating phlegm, and killing insects. It is distributed in most provinces and regions across the country. Symptoms mainly affect the leaves. At first, small purplish-red spots appear at the leaf tip or leaf margin, and after expanding they form circular, semicircular to irregular brown lesions. The lesions have concentric rings. In the later stage the center fades to white, and the red-brown margin is relatively wide. When humidity is high, a grayish-brown mold layer can grow on both sides of the lesions, namely the pathogen's conidiophores and conidia. The disease
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