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Symptoms and Control Methods of Common Leaf Spot Diseases in Geraniums
Geranium leaf spot disease is a common disease in spring and summer. It is most likely to occur in hot and rainy seasons, often causing most of the infected leaves to die and drop off. When the stem is infected, it turns black, wilts and rots; cutting open the base reveals brown or black vascular bundles. Affected cuttings fail to root, with rot starting from the stem and developing upward, causing leaves to wilt and die. Symptoms: Geranium leaf spot disease includes two types: black spot disease and brown spot disease. Black spot disease: initial water-soaked spots appear on leaves, semicircular to irregular in shape, later becoming circular, 2 to 3 mm in diameter,
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A Detailed Guide to Common Geranium Diseases and Their Control Methods
The main diseases of geraniums include: ① Leaf spot disease. In the early stage, needle-tip-sized, round or irregular small brown spots appear on the leaves, which gradually expand into dark brown or reddish-brown lesions. In severe cases, the entire leaf is covered with lesions until it dries up and falls off; the stems and branches also turn black, shrink and rot, and even the leaves on the stems wither and die, leaving only a few leaves at the top. Preventive measures: a. When cultivating in a greenhouse, do not plant too densely, and pay attention to frequent ventilation and light exposure; b. When watering, avoid pouring water onto the plants and avoid splashing water droplets
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What to Do About Dead Mushrooms? A Detailed Guide to Prevention and Control Methods
Causes of dead mushrooms (1) Weak young mushrooms. After the casing soil is applied to the mushroom bed and before fruiting, if the mycelium grows too fast and the fruiting sites are too high, the young mushrooms that form are too densely packed, causing the ones with insufficient nutrient supply to die. (2) Excessive temperature. If the temperature stays above 21°C for several consecutive days during the fruiting period, the young mushrooms will shrivel and die from heat damage. (3) Excessive humidity. When the relative humidity in the mushroom house is above 95% at high temperatures, if the doors and windows are closed after watering, the surface of the mushroom bed becomes waterlogged, causing the young mushrooms to suffocate and die. (4) Poor ventilation. Oxygen in the mushroom house
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Control Methods and Technical Key Points for Physiological Diseases of Button Mushrooms
Button mushrooms are relatively sensitive to their environment. A poor cultivation environment will hinder their normal growth and development, produce various abnormal phenomena, and lead to reduced yield and lower quality. Common physiological diseases of button mushrooms include excessive mycelial growth, hard opening of the caps, thin-skinned early opening, and the appearance of soil-level mushrooms and hollow-stemmed white-core mushrooms. They are described below: Symptoms of excessive mycelial growth: after the mushroom bed is cased and watered, the fluffy mycelium of the button mushroom will continuously grow toward the surface of the fine soil. In severe cases, it will form a fine, water-impermeable mycelial mat, thereby delaying the time of fruiting and reducing the mushroom
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Effective weed control methods in Schisandra chinensis fields
1. The results of a survey of weed species in Schisandra chinensis fields showed that the weeds causing more serious damage in Schisandra chinensis fields include barnyardgrass, crabgrass, amaranth, lamb's quarters, field horsetail, green foxtail, and shortawn foxtail, among which crabgrass, Asiatic dayflower, and lamb's quarters are especially serious. 2. Conventional weed control in Schisandra chinensis orchards Conventional weed control in Schisandra chinensis orchards can be carried out together with intertillage of the orchard, 4 to 5 times per year, with a cultivation depth of about 10 cm, so that the soil is loose and has good aeration, and it also plays a role in drought resistance and water conservation. Weeding is an important means of avoiding nutrient loss and ensuring the plants have enough nutrition to grow healthily.
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Symptoms of Schisandra Leaf Blight and Its Prevention and Control Methods
Schisandra leaf blight is a common disease, widely distributed in Liaoning, Jilin, Heilongjiang and other provinces, and can cause serious consequences such as early defoliation, fruit drop, death of new shoots, weakened tree vigor, decreased fruit quality, and reduced yield. 1. Disease symptoms Leaf blight mainly damages leaves. According to the different initial sites on the leaves and the size of the lesions, it can be divided into two types. ① The disease first starts from the leaf tip or edge, then spreads to the leaf margins on both sides, and then extends toward the center, gradually forming large brown patches; as the disease further
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What are the pest and disease control methods for the Chinese medicinal herb Panax notoginseng?
1. Diseases 1.1 Black spot disease occurs mostly in the high-temperature, high-humidity season from June to July, causing plants to twist and break and die. The control method is to adjust the shade shed's light transmittance to below 20%, and spray with 1.5% polyoxin 150-fold solution or 70% chlorothalonil wettable powder 600-800-fold solution. 1.2 Phytophthora blight is a devastating disease of Panax notoginseng at the seedling stage. It occurs mostly from June to July, damaging leaves and petioles. The control method is to strengthen field management, reduce temperature and humidity; promptly remove residues and burn them in a centralized manner, and spray with 65% zineb wettable powder 500-fold solution for treatment.
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Symptoms and Control Methods of Anthracnose in the Medicinal Plant Panax notoginseng (Tianqi)
Symptoms The disease can occur at the seedling stage and the adult plant stage. Infection at the seedling stage causes damping-off or top blight. At the adult plant stage, it mainly affects leaves, petioles, stems, flowers and fruits. Infected leaves initially develop circular or nearly circular yellow-brown spots with a distinct reddish-brown margin; later the diseased areas tend to rupture and perforate. Infected petioles and stems develop spindle-shaped, yellow-brown, sunken spots, causing the petioles to coil or the stems to twist. Infection of the stem base causes lodging of adult plants or rot of the rhizome. Infection of pedicels and flower discs leads to drying of flowers and seeds. Infected fruits also develop nearly circular yellow sunken spots, causing the fruits to turn brown and rot.
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Control Methods and Technical Key Points for Soybean Bacterial Blight
Soybean bacterial blight is a disease that occurs commonly in soybean-growing regions, reducing the percentage of fully filled seeds, lowering the 100-seed weight, and decreasing both quality and yield. Leaf lesions are initially round, brown to dark brown; as the lesions enlarge, the center turns black, the lesions do not appear raised, and diseased leaves drop easily. Lesions on stems and pods are brown and round, later becoming spindle-shaped. The seed surface is coated with a layer of bacterial slime, often appearing at one end of the seed, and its shape closely resembles a "frog eye." Diseased seeds are shrunken, and the pathogen overwinters on diseased leaves, stems, pods and seeds.
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Occurrence and Integrated Control Methods of Sheep Nasal Bot Fly
Cause: Sheep nasal bot fly is a disease caused by the larvae of the sheep nasal bot fly parasitizing the nasal cavity of sheep, mainly affecting sheep (Ovis aries). The adult sheep nasal bot fly directly deposits larvae, and the larvae become adults after passing through the pupal stage. Adult sheep nasal bot flies appear from May to September each year. After mating, the male fly dies, and the female fly rests until the larvae inside her body develop before flying and becoming active, depositing maggots in the nostrils of sheep to breed larvae. The first-stage larvae attach to the nasal mucosa of sheep and gradually migrate inward, molting into second-stage larvae in the nasal cavity and frontal sinuses, and by the spring of the following year, they develop into mature third-stage larvae.
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