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Symptoms and control methods of downy mildew in codonopsis (Codonopsis pilosula)
Irregular brown lesions appear on the leaf surface, and a gray mold-like growth (conidiophores and conidia) appears on the underside of the leaves, which can cause the plant to die. Control method: remove diseased plants and fallen leaves and burn them in a centralized manner; during the disease period, spray 300-fold dilution of 40% Shuangyiling or 1000-fold dilution of 70% chlorothalonil, once every 7 to 10 days, for 2 to 3 consecutive times.
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How to Store and Keep Sweet Potatoes Fresh? A Full Breakdown of the Technical Points
Sweet potato (Ipomoea batatas) is a traditional product of Shanting District. Since 2000, 3 townships in this district have processed sweet potato jujube for foreign trade companies every year, with an annual processing volume of 1.6 million kg of sweet potato jujube, and have thus developed a set of sweet potato cellar storage and preservation techniques with very good results. The key technical points are introduced as follows: 1. Cellar. Choose a place with relatively high terrain and soil mainly of red loam to build the cellar. The depth of the cellar is preferably about 3 m, and the two storage chambers for sweet potatoes should be no less than 1.8 m in height and no less than 2.5 m in length and width.
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How to grow azaleas? A full breakdown of cultivation and management key points
(1) Potting and repotting: Use yellow mud + leaf mold as the main components, mix in a little river sand as the growing medium, ensure the soil is on the acidic side, and avoid heavy clay soil. When first potting, choose as small a pot as possible, then gradually move to larger pots; azaleas do not need repotting every year, and repotting and soil replacement should only be considered when the roots have filled the pot and water no longer drains out easily. (2) Cutting propagation: The plum rain season is the best time for cuttings, when the new azalea shoots are already semi-lignified and the temperature and humidity are suitable, which is very favorable for the rooting and survival of the cuttings. Take healthy new shoots about 5-7 cm long, remove the lower leaves, keep 3-4 top leaves, and use mountain soil mixed with yellow sand as the base
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How to grow Dawn Redwood (Metasequoia glyptostroboides) from seed? A full breakdown of the key techniques
The techniques for growing Dawn Redwood from seed are: 1. Seed collection: Dawn Redwood flowers in early to mid-March, and the cones reach maturity from mid-October to early November of the same year. When the cone scales turn from green to yellowish-brown, crack slightly, and a small amount of seed falls out, the seeds are ready to collect. After the cones are collected, spread them out to air-dry or expose them briefly to the sun; the scales open and the seeds fall out. 2. Seed treatment: Before sowing, soak the seeds in cold water for 3 to 5 hours so they absorb water and swell fully, which aids germination and ensures even emergence. 3. Sowing: From late March to early April,
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How Are Candied Jujubes Processed? A Full Breakdown of the Production Flow
Candied jujubes are dried preserves made from fresh jujubes. The processing technique is as follows: 1. Raw material selection: Generally, varieties with large fruit, small pits, loose flesh, thin but tough skin, and relatively little juice should be chosen. The best fruit maturity is when the green color begins to fade and the fruit turns milky white. 2. Grading: Grade the jujube fruits by size, removing deformed fruits, fruits affected by pests or disease, overripe fruits, and damaged fruits. 3. Slitting: To facilitate sugar penetration and flattening into shape, the fruit surface is usually slit. The jujube fruits are fed into the channels of a jujube cutting machine (slitting machine) to be slit, with the cutting depth
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How to prevent and control rose downy mildew? These methods you need to master
Downy mildew is a fungal infectious disease. Rose downy mildew develops quickly and is extremely harmful, making it a devastating disease. It mainly affects new shoots and leaves in the middle and lower parts of the plant. In the early stage, chlorotic spots appear on the underside of the lower leaves, and the spots are irregular and covered with a frost-like mold layer. Later they turn dark purple, resembling water-soaked areas, until they become brown. The spots are polygonal and gradually become scorch-like. When the damage is severe, all the leaves drop and the plant dies. Control measures 1. Plant at a reasonable density, no more than 12 plants per square meter, and
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Lamb with arched back, lying down, weak limbs, not moving? White muscle disease prevention and treatment methods are here
Arched back, preferring to lie down, weak limbs, not moving: prevention and treatment methods for lamb white muscle disease
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How to Prevent Heatstroke and Cool Down Pigs in Summer? A Detailed Guide to Practical Methods
Pigs are afraid of heat. In the hot summer, if heatstroke prevention and cooling methods are improper, pigs will suffer heatstroke and in severe cases die, causing unnecessary losses. The heatstroke prevention and cooling methods are as follows: 1. Suitable temperature: Because pigs vary in body weight, their growth and development requirements for suitable temperature differ. For a pig weighing about 20 kg, the suitable ambient temperature is 24°C; for 50 kg, 23°C; for 100 kg, 20°C. In general, the temperature suitable for pig growth is 15-28°C, and the optimal temperature is 22°C. If the temperature reaches 35°C and cooling work cannot keep up, pigs weighing 45 kg
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What precautions should be taken when processing snake venom? A full breakdown of the key operational points
1. Pay attention to safety when extracting and processing snake venom. To strictly prevent venomous snakes from injuring people, the movements for releasing the snake during and after venom extraction must be quick. When returning a snake that has been milked to its cage, first place the snake's body inside, and when the snake's head approaches the edge of the container opening, let go quickly. If you cannot withdraw your hand in time when releasing the snake, you can easily be bitten by the snake striking back. 2. Venom extraction equipment must be strictly sterilized. 3. If the venomous snake clamps onto the vessel and will not let go, you may gently swing the snake's trunk; if it still will not release its bite, you may gently twist its neck, or use a small stick or your finger to stimulate the snake's cloaca. Never pull hard
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How to control subsurface pests in upland rice? A full breakdown of practical techniques
In recent years, with the application and promotion of dry-raised transplanting techniques, upland rice cultivation in Gejiu City has become a new highlight of economic growth in mountainous rural areas. How to do a good job in controlling subsurface pests is an important technical measure for developing upland rice production and ensuring increased yield and income. The common subsurface pests of upland rice mainly include white grubs (the larvae of scarab beetles), wireworms (the larvae of click beetles), mole crickets, and cutworms (cut worms). These pests live in the soil during their damaging period, feeding on seeds, young sprouts, roots and stems, causing missing plants, gaps in rows, or
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