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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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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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What are the control methods for primrose brown spot disease?
Symptoms are prone to occur on the fairy primrose (Primula malacoides). Brown spots form on the leaves. The pathogen Alternaria sp. belongs to the deuteromycete Alternaria fungi. Transmission route: conidia are spread by wind and rain. Control method: spray fungicides such as 70% chlorothalonil wettable powder at 1000 times dilution in the early stages of the disease.
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A Detailed Guide to the Prevention and Control of Brown Spot Disease in Primroses
Symptoms are prone to occur on the fairy primrose (Primula malacoides). Brown spots form on the leaves. The pathogen Alternaria sp. belongs to the deuteromycete Alternaria fungi. Transmission route: conidia are spread by wind and rain. Prevention and control method: spray 70% chlorothalonil wettable powder at 1000 times dilution or other fungicides at the early stage of the disease.
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How do you prevent and control brown spot disease in primroses?
Symptoms of primrose brown spot disease: it occurs mostly on the fairy primrose (Primula malacoides). It is caused by Alternaria fungi of the Deuteromycota (Fungi Imperfecti). Infected plants have brown spots on their leaves. The route of infection is that conidia are spread by wind and rain. Control method: at the early stage of the disease, spray fungicides such as 70% chlorothalonil wettable powder at 1000 times dilution.
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How do you prevent and control mosaic virus disease in primroses?
Symptoms The whole plant is affected. Leaves are small, deformed, with dark green mottling, and yellowing. Diseased plants do not bloom; even if they do bloom, the flowers have mottling, are stunted and deformed. The pathogen is Cucumber mosaic virus (CMV). Hosts include more than 190 species in 45 families of dicotyledonous and monocotyledonous herbaceous and woody plants, such as Cucurbitaceae, Solanaceae, Asteraceae, Brassicaceae, Rosaceae and Liliaceae. Transmission routes: more than 80 species of aphids can transmit the virus in a non-persistent manner, but the main transmission vectors are the green peach aphid and the cotton aphid. The main source of infection is surrounding weeds. Prevention and control
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