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A Detailed Guide to the Control Strategies and Methods for Lily Diseases
Control of Phytophthora blight (1) Adopt high-ridge, deep-furrow cultivation or ridge planting, and keep the bed surface level to facilitate drainage. When diseased plants are found, dig them out early and burn them in a centralized manner or bury them deep. (2) Adopt a balanced fertilization technique, appropriately increase the application of potassium fertilizer, and improve disease resistance. (3) At the early stage of the disease, spray 40% fosetyl-aluminum wettable powder at 250 times dilution, or 58% metalaxyl and mancozeb wettable powder, 64% oxadixyl and folpet wettable powder at 500 times dilution, 72% DuPont Curzate wettable powder at 800 times dilution.
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Symptom Identification and Control Methods of Lily Viral Diseases
Common lily viral diseases include the yellowing-wilt type and the mosaic type. In the yellowing-wilt type, no special lesions appear on the leaves; the entire plant takes on a yellow color, and the internodes shorten. The plant becomes dwarfed, and the leaves yellow and shrivel. In the mosaic type, irregular pale green mottling appears on the leaves, then the small pale green areas join and expand, forming slender yellow streaks along the veins, which later become slightly sunken and turn pale yellowish-brown to reddish-brown. The virus mainly overwinters in the bulbs and becomes the source of primary infection the following year; secondary infection in the field is mainly caused by transmission by aphids. When there are many diseased bulbs, the weather is dry, and aphid populations are
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How to prevent and control lily pests and diseases? A detailed guide to practical methods
1. Damping-off mainly causes damage at the seedling stage, causing plants to wilt. The disease is severe when ventilation is poor and water accumulates in the field. Control methods: (1) Practice reasonable crop rotation, and choose plots with good drainage and loose soil for planting; (2) Strengthen field management, open drainage ditches in time, and improve ventilation and light conditions; (3) Before sowing, soak the seed bulbs in a 1:500 thiram solution or 2% formalin for 15 minutes; (4) When the disease occurs, promptly remove diseased plants, and disinfect the affected area with 5% lime milk.
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Detailed Explanation of Lily Pest and Disease Control Measures and Practical Methods
(1) Rotate crops with a 3-year break. When planting lilies along a slope, plant from the bottom upward to reduce the spread of pathogens. (2) Select bulbs free of disease, mites and mechanical injury as seed bulbs to reduce sources of bacteria and mites. (3) Burn dead branches and fallen leaves in the field and diseased and pest-infested plant residues to reduce sources of pests and diseases. Organic fertilizer should be composted and fermented until fully decomposed before being applied to the lower soil layer. (4) Use deep furrows and high beds, clear the furrows and drain water to control soil moisture content. (5) Soak for disinfection and mite elimination. Before sowing, use a 4000-fold dilution of 20% Saomanjing wettable powder plus a 70% Thiophanate-methyl wettable powder
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What are the control methods for lily pests and diseases?
1. In the middle and late growth stages, the bulb and stem roots are prone to root rot, showing bright dark-brown rot spots. Basal rot easily occurs at the stem base of the plant, causing leaves to droop and turn yellow; leaf spot disease can also infect the leaves, causing the plant to stop growing. Bulb and scale rot disease shows brown to dark-brown spots on the underground stem, gradually expanding into the interior of the stem and causing the bulb to rot. There is also a damping-off disease, in which the young leaves of diseased plants show yellow-green or white spots, and in severe cases the leaves turn brown and curl. Control: damping-off is a physiological disease, while other diseases are all caused by fungi
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How to prevent and control southern blight in lilies? A full analysis of the key methods
Symptoms: The whole plant wilts, white mycelial strands or rapeseed-like tan-colored small sclerotia wrap around the stem base, and the affected part turns brown and rots. Large amounts of white mycelial strands and tan-colored sclerotia are visible on the soil surface. Pathogen: Sclerotium rolfsii Sacc., called the sclerotium-forming fungus, belongs to the Deuteromycotina fungi. The hyphae are white and silky, spreading in a fan-like or radial pattern, then gathering into mycelial strands or tangling into sclerotia. The sclerotia resemble rapeseeds, initially white to yellowish-white, later turning tan, round, with a smooth surface. Transmission routes: (1) The pathogen
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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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Symptoms and Control Methods of Botrytis Blight in Primroses
Botrytis blight is a common and widespread disease of primroses. [Pathogen] Botrytis cinerea Pers. et Fr. [Symptoms] Water-soaked spots appear at leaf tips or leaf margins, then gradually enlarge, turn brown to black, and rot; stems develop irregular brown lesions and are prone to soft rot; flowers turn brown, rot, and drop off. In the late stage of the disease, a grayish-brown mold layer forms on the affected parts. [Disease cycle] The pathogen overwinters in diseased plant residues or in the soil. Conidia are spread by wind and rain
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