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What are the control methods for rose black spot disease?
Black spot disease mostly occurs in the hot and humid rainy season. Purple-brown round lesions appear on the upper surface of the leaves, with slightly ciliate edges, and many small black dots grow in the center. These small black dots are the acervuli of the pathogen. After the small black dots crack open, spores are released, causing the disease to spread, and it can also spread with rainwater. Black spot disease relies on con...
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What are the control methods for the rose long-tube aphid?
The rose long-tube aphid belongs to the order Homoptera, family Aphididae. It damages roses, multiflora roses, 'Shijiemei' roses and others with nymphs and adult aphids; the affected young leaves and flower buds stop growing and are difficult to extend, and the honeydew excreted often sticks to the leaves, reducing their ornamental value. 1. Morphological characteristics: The wingless parthenogenetic female is relatively large, body elongated-oval, 4.2 mm long.
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Symptoms, Identification, and Control Methods of Rose Rust
Rose rust occurs in climatically suitable regions around the world. It sometimes causes severe damage to greenhouse-cultivated roses. In addition to roses, the disease can also infect rugosa roses, wild roses, and other flowering plants. Pathogen: Rose rust has many pathogenic species; 10 species have been reported abroad and 3 species are known in China. Among them, Phragmidium montivagum (Pers.) Schlecht. is the main pathogen, belonging to the phylum Basidiomycota, genus Phragmidium.
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Symptoms and Control Methods of Rose Little Leaf Disease
Symptoms Rose little leaf disease is a common physiological disease of roses in northern China. Little leaf disease occurs on young shoots and young leaves, and is more obvious when roses sprout in spring. Diseased branches sprout later, and after the leaves emerge, the leaves are narrow, small and slender, with leaf margins turning upward, hard and brittle texture, and a relatively pale yellow-green leaf color, with uneven color intensity...
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Symptom Identification and Control Methods for Rose Green Petal Disease
Symptoms: The main manifestation is narrow, thin petals that appear green and sepal-like or leaf-like, with the corolla turning green and flowers transforming into leaves; this is the typical symptom of rose green petal disease. Any plant affected by this disease, under the same cultivation and management conditions, will be more dwarfed than ordinary rose varieties, with profuse lateral branching, narrow and small leaves, and the petioles and stems rarely showing red coloration...
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What are the control methods for corn brown spot?
How do you control corn brown spot? Please advise. Corn brown spot can be controlled as follows: (1) Rational fertilization. Apply sufficient base fertilizer, pay attention to the balance of nitrogen, phosphorus and potassium fertilizers, and avoid over-applying nitrogen fertilizer, so as to enhance the disease resistance of the plants. (2) Early prevention. Hybrids with Huangzaosi bloodline are susceptible to brown spot. At the 5-6 leaf stage...
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What are the control methods for mung bean aphids?
How should mung bean aphids be controlled? Please advise. Mung bean aphids mainly damage the tender leaves, young shoots, and heart leaves of mung beans, causing the affected leaves to curl and the plants to be stunted. Aphid outbreaks are closely related to temperature and humidity. When the temperature is above 25°C and the relative humidity is 60-80%, outbreaks are severe. Continuous rainy days or high-temperature weather are unfavorable...
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What are the control methods for mung bean leaf spot disease?
How should mung bean leaf spot disease be controlled? Please advise. The occurrence of mung bean leaf spot disease is closely related to temperature and humidity. Under conditions of 85% to 90% relative humidity, at temperatures of 25 to 28°C, the pathogen's conidia germinate most rapidly; when the temperature reaches 32°C, mycelial growth is most vigorous and the disease develops most rapidly...
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Pest and Disease Control Methods and Technical Key Points for Shiitake Mushroom Log Cultivation
There are many types of contaminant fungi parasitic on mushroom logs, commonly including Trichoderma, Schizophyllum commune, Lenzites betulina, and Panus lepideus. Among insect pests, there are slugs, snails, and millipedes that damage fresh mushrooms, and longhorn beetle larvae, bark beetles, and termites that damage mushroom logs. In terms of control, the policy of "prevention first, integrated control" should be implemented, streng...
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Control and Prevention Methods for Common Potato Diseases
How to control and prevent common potato diseases? Please give guidance. Common potato diseases include the following: A. Potato late blight. 1. Prevention: choose protective fungicides, such as Dashengfu (mancozeb suspension concentrate produced by Dow AgroSciences), Bibei (Bordeaux mixture). The key techniques for preventive fungicides...
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