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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 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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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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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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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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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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Causes of Lily Disease Epidemics and Integrated Control Techniques
I. Symptoms: They appear on leaves, stems and bulbs. When leaves are infected, leaf blight results. At first the leaf tip turns brown, with a length of 1-2 mm, then gradually worsens, and the lesion expands into a nearly triangular shape, becomes thinner, and takes on a dried-up appearance with cloud-like patterns on it. Lesions are generally 17-28 mm long and 5-8 mm wide; the largest lesion is 56 mm long and 12 mm wide. Eventually the leaf dies. Some also occur at the leaf margin as semi-elliptical brown lesions, which can also cause leaf death. Ground
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The broken-planting technique for oyster mushroom logs helps increase yield
For oyster mushrooms cultivated in mushroom bags, the yield drops greatly after 2-3 flushes of mushrooms. If the temperature rises, the quality will also be reduced. How can later flushes be cultivated to equal or even exceed the yield of the previous flushes? Below is a simple and practical method - the broken-planting method. Remove the plastic bags from mushroom bags that have produced 2-3 flushes, then scrape the old surface layer once, and soak in 5% lime water. If the mushroom logs are relatively dry, also soak in 1% salt water for half a minute. Before soaking, poke a hole through the mushroom log from top to bottom so
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How to Increase Gastrodia elata Yield? The Three-Switch Measures Are Key
Gastrodia elata is a fine medicinal herb and has been selling well in the market in recent years. The farmers of Chalu Village, Baoshan Town, Fengcheng City, Liaoning Province, regard developing Gastrodia elata production as an important path to wealth; more than 40 households in the village grow Gastrodia elata and earn considerable income every year. Li Jingrong, a retired cadre of the village, has grown Gastrodia elata for 14 consecutive years and accumulated rich experience. He found that the yield of artificially cultivated Gastrodia elata tends to decline year by year. There are mainly 3 reasons: first, because self-bred and self-propagated tuber seeds are used year after year, the degeneration is severe; second, because self-bred and self-propagated fungal strains are used year after year,
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Getting the five key steps right in Gastrodia elata cultivation can effectively increase yield
To achieve stable and high yields of Gastrodia elata, the first thing is to get the five pre-planting steps right: First, choose the site. Gastrodia elata cultivation can be adapted to local conditions, whether indoors, in air-raid shelters, semi-basements, or chicken coops. Because Gastrodia elata likes dark, damp, and cool environments, choose places with good ventilation and shade as much as possible, with semi-basements and outdoor trenches giving the best results. You can lay a layer of bricks before use, or increase the thickness of the bottom sand layer to enhance its water permeability. Second, if the indoor floor is concrete, use high-quality Armillaria mellea fungal material (spawn). Armillaria mellea fungal material
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