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How to Control Impatiens Leaf Spot Disease
I. Symptoms of Damage: Disease scientific name: Phyllosticta impatientis Fautr. Impatiens leaf spot disease mainly damages the leaves. Initially, small yellow spots appear, gradually expanding outward into circular lesions, 2-5mm in size. Later, the center of the lesion turns light brown or grayish-white, with slightly raised brown edges, and black small granules form on the surface, which are the pathogen's pycnidia. If the pathogen invades from the leaf tip or leaf margin, it causes the leaf tip to die and the leaf margin to scorch. The disease occurs in Guangdong and Yunnan from July to September. II. Morphological Characteristics of the Pathogen: The pathogen is called
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Symptoms and Control Methods of Alternaria Leaf Spot on Impatiens
[Symptoms]The spots on affected leaves are round to oval, dark brown, slightly zonate, 2-10 mm in diameter, with a slightly darker margin. Some spots may expand and merge into patches, bearing a pale green or olive-black mold-like growth, which consists of the pathogen's conidiophores and conidia. The older leaves in the middle and lower parts of the plant are more susceptible; in severe cases, the diseased leaves shrivel and die. [Pathogen]Alternaria tenuis Nees., belonging to Deuteromycotina, genus Alternaria, a fungal pathogen. Conidiophores are erect, brown,
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How to control Cercospora leaf spot on Japanese honeysuckle
Cercospora leaf spot of Japanese honeysuckle (Cercospora rhamni). (1) Damage: it affects the leaves, and in summer, from July to August, the disease is severe; after onset, the spots on the leaves are round or, restricted by the leaf veins, polygonal, yellow-brown, and in humid conditions gray mold-like growth appears on the underside. (2) Control method: remove diseased branches and leaves to reduce the source of the pathogen; spray Bordeaux mixture at 1:1.5:200 in the early stage of the disease, once every 7-10 days, for 2-3 times in a row.
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How to treat pig lice? Peach leaf decoction works well
In summer and autumn, pigs are prone to pig lice, which not only affects the pigs' calm and hygiene, but also hinders their growth and development. The method to prevent and treat pig lice is: take 1000 grams of fresh peach leaves, add 2000 milliliters of water and boil, take the cooled filtrate, wash the places on the pig's body where lice are present, and wash continuously twice, then all the pig lice can be killed, and the lice eggs will also be destroyed. If cattle have cattle lice, this method can also be used to kill them.
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How to prevent and control peach leaf brown spot and shot hole disease? Detailed explanation of prevention and control methods
Occurrence pattern: The pathogen mainly overwinters as mycelium on diseased leaves or in the diseased tissues of affected shoots. In the spring of the following year, as temperatures rise and rain arrives, the pathogen produces conidia. The conidia spread by wind and rain, infecting leaves, new shoots and fruit. The disease occurs more severely in orchards on low-lying land with poor ventilation and damp, shady conditions, or in rainy years. Prevention and control methods: (1) Agricultural control: reasonable pruning. Keep the orchard well ventilated and well lit, reduce humidity in the peach orchard, and create conditions unfavorable for the disease.
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How to prevent and control bacterial leaf spot in primroses
Symptoms On the common primrose (Primula malacoides), leaves and flower receptacles are affected. Initially, water-soaked irregular lesions form along the leaf veins, which later turn yellow, then the lesions turn brown, enlarge, and marginal blight symptoms occur. In severe cases, the lower leaves die. On the polyanthus primrose, dark water-soaked spots initially form on the leaves, which later turn light brown with a distinct yellow halo around them. Pathogen: Pseudomonas syringae pv. primulae (Arke et Gardner) Young, Dye et Wilkie
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What are the control methods for leaf spot disease in primroses?
Control of leaf spot disease in primroses: 1. Select and breed disease-resistant varieties. 2. Strengthen fertilizer and water management, apply more organic fertilizer and phosphorus-potassium fertilizer, and avoid over-applying or applying excessive nitrogen fertilizer alone. 3. After the disease first appears at the seedling stage, begin spraying 70% thiophanate-methyl wettable powder at 1000 times dilution plus 75% chlorothalonil wettable powder at 1000 times dilution, or 50% sulfur mixture suspension or 36% thiophanate-methyl suspension at 500 to 600 times dilution, or 1:1:100 Bordeaux mixture.
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What are the control methods for primrose leaf spot disease?
Symptoms The disease occurs on the leaves. The spots are usually 3-4 mm in diameter and brown; in severe cases, the diseased leaves wither and die, causing defoliation. The disease spreads from the lower leaves to the upper leaves. The pathogen is Ramularia primulae Thumen, the primrose Ramularia fungus. It belongs to the Deuteromycotina fungi. The conidiophores emerge from the stomata, growing in clusters of several branches, very short, unbranched, colorless, with slightly curved tips; the conidia are cylindrical or short club-shaped, single-celled or two-celled, colorless, measuring 16-24 x 3-4 micrometers. Transmission routes and conditions for disease development
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Symptoms and Control Methods of Primula Leaf Spot Disease
Symptoms: It mainly affects the leaves of the plant. The disease spreads from the lower part of the plant to the upper part. The spots are usually 3 to 4 mm in diameter and brown; in severe cases, the diseased leaves wither and die, causing defoliation (see Figure 2). The disease is caused by Ramularia primulae. The pathogen overwinters as mycelium or conidiomata on diseased plant debris, and seeds can also carry the pathogen, becoming the primary infection source for the following year. The disease mainly spreads through conidia carried by air and rainwater. Reinfection is frequent during the growing season. Plants are usually prone to the disease in warm, humid weather and when nitrogen fertilizer is applied excessively.
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Symptoms and Control Methods of Lily Leaf Blight
Lilies are native to the eastern and central regions of China. They are relatively cold-tolerant, prefer strong light, and do not tolerate shade. Insufficient light will affect growth and flowering. They do best in well-drained, organic-rich sandy loam. They have poor disease resistance and are susceptible to disease in hot, humid environments. Lily plants are upright and elegant, with large, brightly colored flowers and many varieties. They are suitable for planting in patches or clumps at the edges of lawns or in flower borders, creating a serene and harmonious effect. Lilies are also prized as potted flowers and cut flowers. Lily leaf blight, also known as lily gray mold, affects the plant's photosynthesis, hinders growth, and reduces ornamental value. When the disease occurs severely
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