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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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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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Oyster Mushroom Soft Rot: Control Methods and Key Technical Points
1. Culture material treatment: choose fresh cottonseed hulls or corn cobs as raw materials. Before mixing the material, it should be exposed to the sun for 2-3 days, or ultraviolet light should be used to kill some of the contaminating microorganisms in the culture material. During fermentation, strictly follow the fermentation process to ensure it is thorough, even and complete. Products such as warming fermentation agents, Lixin Junwang or Kemei Wang can be added to improve resistance to contaminating microorganisms. 2. Management during the spawn-running period: when cultivating large bags for fruiting, they should be placed in a cool, ventilated and clean location. Try not to cultivate them inside the mushroom house (shed), to avoid the growth of large amounts of contaminating microorganisms during the mycelial cultivation process, which can lead
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How to prevent and control cotton seedling diseases? Detailed spring prevention and control methods
In recent years, due to low temperatures in spring, seedling diseases in direct-seeded cotton fields have occurred severely, causing large numbers of dead seedlings in cotton fields. In order to improve the economic benefits of cotton farmers and reduce the losses caused by diseases, the symptoms and prevention and control methods of several cotton seedling diseases are introduced as follows: 1. Symptoms of damaged cotton seedlings 1. Anthracnose: Both leaves and stems can be affected. After the seedlings are damaged, reddish-brown spindle-shaped streaks appear at the base of the stem, with longitudinal cracking. In severe cases, the lesions expand, turn brown, blacken, and rot, leading to seedling death. When the weather is humid, the lesions produce orange-red sticky substances.
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Symptom Identification and Control Methods for Cotton Brown Spot Disease
Symptoms The disease mainly affects leaves. When cotyledons are infected, pinpoint-sized purplish-red spots first appear, then expand into brown, purplish-edged, slightly raised round to irregular lesions; multiple lesions merge together to form large patches, with small black dots scattered in the center, which are the pathogen's pycnidia. The center of the lesion easily breaks off and falls out, forming holes, and in severe cases the leaves drop off. On true leaves, the lesions are round, yellowish-brown, with purplish-red edges. Pathogen Phyllosticta gossypina Ell. et Mart., called cotton Phyllosticta leaf spot
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Symptoms and Prevention and Control Methods of Duck Viral Swollen Head Hemorrhagic Disease
Duck viral swollen head hemorrhagic disease is an acute septic infectious disease of ducks caused by duck viral swollen head hemorrhagic disease virus. Its clinical features include swelling of the duck's head, conjunctival hyperemia and hemorrhage, extensive hemorrhage of the whole body skin, enlarged liver that is earth-yellow in color and accompanied by hemorrhagic spots, body temperature above 43°C, and passage of thin grass-green feces. The incidence rate is 50%-100%, and the mortality rate is 40%-80% or even 100%. It is a new infectious disease that seriously harms the duck farming industry. 1 Epidemiological diagnosis of duck viral swollen head hemorrhagic disease Cheng Anchun et al. (2003
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