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Detailed Guide to the Control Methods of the Tea Green Leafhopper (Empoasca onukii)
The tea green leafhopper (Empoasca onukii), commonly known as "fuchenzi," is one of the major pests on tea plants in all tea-producing regions of our province. Damage from this pest ranges from minor harm to buds and leaves with reduced yields, to severe destruction of buds and leaves resulting in total crop loss. I. Morphological Characteristics The tea green leafhopper belongs to the order Homoptera, family Cicadellidae. Its life cycle passes through three stages: egg → nymph → adult. 1. Egg: crescent-shaped, about 0.8 mm long and about 0.15 mm wide, initially milky white, gradually turning pale green; before hatching, a pair of red eye spots is visible through the front end. 2. Nymph: 5
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What are the symptoms of apricot leaf marginal scorch?
Apricot leaf marginal scorch is a common physiological disease of apricot trees. It occurs in all apricot-producing regions, and is more severe in the north. Apricot leaf marginal scorch only harms the leaves. Symptoms generally appear first at the leaf margins; in the early stage the margins dry up, and sometimes the dried portions fall off. The lesions gradually spread inward, with a clear boundary between the affected edge and the healthy part. Severely affected leaves curl upward toward the upper surface, and often drop early.
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How to treat garlic leaf blight? Master integrated control techniques in one article
Shandong is a major garlic-producing region, and garlic suffers fewer diseases than other vegetables. However, in recent years, a relatively rare new disease, garlic leaf blight, has appeared in garlic-growing areas, and it strikes fiercely and causes severe damage. Once this disease occurs, it can cause major yield reductions. I. Symptom identification This disease mainly affects leaves and leaf sheaths. Leaf infection falls into two types: first, the tip-blight type, which mainly occurs in the initial infection stage, with the leaf tip turning dark brown and forming many dark purplish-brown oblique parallel stripes on it; in severe cases the lesions extend to 1/3 to 4
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Can 2,4-MCPA herbicide be used at the 2-leaf stage of rice?
Rice and other grass-family crops are sensitive to 2,4-MCPA before the 3-leaf stage, and improper use can easily cause herbicide injury to the crop, with symptoms such as deformed young leaves. After the 4-leaf stage, as leaf age increases, tolerance to 2,4-MCPA gradually strengthens, with the strongest tolerance at the peak tillering stage, and sensitivity gradually increases again after jointing. Therefore, in production it is generally required to apply 2,4-MCPA from the 4-leaf stage of rice to before jointing, and the dosage must not be increased at will, to ensure safety to rice. Nufarm Australia Limited's Agritox
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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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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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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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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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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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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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