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Control Methods and Technical Key Points for Licorice Brown Spot Disease
Brown spot disease is an infection caused by a type of imperfect fungus (Deuteromycete), mainly damaging the leaves. Its symptoms are: circular or irregular lesions appear on the leaves, the center of the lesion is grayish-brown, the edge is brown, and black mold-like growth occurs on both sides of the lesion. Control methods: spray 1:1:100-1:1:160 Bordeaux mixture or spray 70% thiophanate-methyl wettable powder at 1500x-2000x dilution.
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Detailed Explanation of Control Methods for Licorice Leaf Spot Disease
① The pathogen is a type of imperfect fungus (Cercospora astragali), belonging to the subdivision Deuteromycotina → Moniliales → Cercospora fungus. It damages leaves; affected leaves produce circular or irregular lesions, with the center of the lesion grayish-brown and the edges brown, and grayish-black mold-like growth on both the front and back of the lesions. Fruiting bodies grow on both sides of the leaf, but mainly on the upper surface; the stroma consists of only a few brown cells; conidiophores are born in bundles of 6 to 12, pale brown, with the apex lighter in color and narrower, unbranched, having 0 to 5 geniculate nodes, with the apex nearly truncate, spore scars prominent, and 1 to 7 septa; conidia are whip-shaped to obclavate, colorless and transparent, straight to curved, with the base truncate to nearly truncate, the apex slightly blunt, and 3 to 10 septa.
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How to increase the success rate of shiitake mushroom log production
1. Select high-quality spawn. For successful edible mushroom production, high-quality spawn is key. Choose high-quality spawn that is contamination-free, with thick, sturdy mycelium and uniform growth. It is best to test the spawn or conduct a fruiting trial before use. 2. Do a good job of log processing. Use polyethylene bags with uniform thickness, strong elasticity and high-temperature resistance for the outer bag; keep the culture material-to-water ratio at 1:1.1-1.2; pack the material with moderate tightness; tie the bag openings at both ends tightly and seal them by melting with a flame; when making logs in the high-temperature season, mix in a 1800-fold carbendazim solution or Kemeiwang, etc., to improve their own disease resistance
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Four Practical Methods for Controlling Pests and Diseases in Flowers, Trees and Bonsai
Using pesticides to control pests and diseases in flowers and trees easily pollutes the environment. Here are 4 safe methods for controlling pests and diseases in flowers and trees. 1. Spraying method (1) Mix 0.5 kg of plant ash with 2.5 kg of water, soak for 24 hours, take the filtered clear liquid and spray it, which can kill aphids on plum blossoms, Chinese roses, pomegranate trees, etc. (2) Spray with a 0.1% concentration baking soda solution, which can control powdery mildew on flowers such as Chinese roses, chrysanthemums, garden balsam, cotton rose, and cineraria, with a control rate of over 80%.
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Methods and Technical Key Points for Pest and Disease Control in Phalaenopsis (Moth Orchid)
Doing a good job of pest and disease control is an important part of successfully cultivating Phalaenopsis. Disease prevention is routine work: the growing environment must be well ventilated, the potting medium and air humidity suitable, and Bordeaux mixture, chlorothalonil, thiophanate-methyl and similar chemicals sprayed regularly to prevent disease. Once pests or diseases occur, apply chemicals promptly for control. I. Main diseases and their control: 1. Petal gray mold: black mold spots form on the petals, and mycelium can be seen on the mold spots. 2. Anthracnose: large dark brown or light brown oval or irregular lesions grow on the leaves, and on the lesions
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Detailed Explanation of Key Points for Pest and Disease Control in Phalaenopsis Orchids
Diseases: Phalaenopsis orchids are native to trees in tropical rainforests, where they not only grow vigorously but also rarely suffer from disease infestations. The most important disease is blight, which is caused by a fungus that invades the leaf tissue of the plant, divides and multiplies within the tissue, and destroys the cells of the tissue. This fungus divides and multiplies at an astonishing rate, and in just twenty-four hours, it is enough to destroy a healthy plant. The fungi that can infect Phalaenopsis plants include (1) Phytophthora Palmivora (2) Phytoph
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Pollution-free control methods for pests and diseases in flowers, trees and bonsai
Alcohol swabbing method: gently swab the leaves of orchids infested with scale insects using disinfecting alcohol; this can kill the scale insects, and in the following year there will rarely be any scale insect damage. Vinegar swabbing method: soak a cotton ball in edible vinegar (rice vinegar), then gently swab the leaves of camellias; this not only kills scale insects but also restores the damaged leaves to a green, glossy condition. Iodine swabbing method: when dry rot is found on the trunk of a stump bonsai, immediately use a blade wiped with iodine to scrape away all the rotted parts, reaching down to the xylem, then apply iodine to the main trunk; one week
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What are the common pest and disease control methods for African violets?
I. Diseases 1. Ringspot disease This is a disease caused by a virus, generally spread by the pest thrips. After the leaves are infected with the virus, ring-shaped markings appear. Preventing the occurrence of viral disease by controlling thrips is the main measure for controlling ringspot disease. Plants infected with the virus generally cannot be cured with medicine; the only option is to pull them out and destroy them. 2. Leaf spot disease This is a leaf disease caused by fungi, first appearing on the lower leaves of the plant, especially leaves that are damaged or in contact with the growing medium. In the early stage of the disease, necrotic
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What are the common pests and diseases of rhododendrons?
Rhododendron black spot disease, also called brown spot disease, is a common and frequently occurring leaf spot disease of rhododendrons. After infection, black spots form on the leaves, which gradually dry up and fall off until the plant dies. The disease mainly affects rhododendron leaves and is caused by infection with the fungus Cercospora rhododendri. The pathogen first appears as several small brown spots; as these spots continually expand, the lesions join together into patches, producing grayish-brown mold mycelium. The affected leaves begin at the petiole, turn from green to brownish-yellow and drop early, and in severe cases this affects the growth and development and ornamental value of the rhododendron. The pathogen overwinters on leaves or diseased plants.
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Identification and Control Methods for Common Pests and Diseases of Azaleas
Azaleas are mainly grown for ornamental purposes, and they are highly vigorous and easy to plant. Azaleas have a habit of four loves and five fears: they love partial shade, love coolness, love moisture, and love acidic soil; they fear blazing sun, fear intense heat, fear heavy fertilizer, fear coal smoke, and fear poor air circulation. Here is an introduction to common pests and diseases and their control methods; (1) Azalea diseases. During the growth process of azaleas, the diseases manifested on the leaves fall into two types: physiological diseases and pathological diseases. (1) Physiological diseases. During the growth process of azaleas, if the trace element iron is deficient, iron-deficiency chlorosis often occurs. In the early stage of the disease, the mesophyll of new leaves fades from green to yellow, while the veins remain green, thus forming leaves with a green net-like pattern. As the condition worsens, the entire leaf turns yellow-white, the leaf tips and leaf margins become scorched, and finally leaf drop results.
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