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What are the control methods for the rice green leafhopper?
Scientific name Inazuma dorsalis (Motschulsky), synonym Recilia dorsalis (Motschulsky), belonging to Homoptera, family Cicadellidae. Distributed in the rice-growing regions south of the Yellow River. Hosts include rice, corn, sorghum, millet, sugarcane, wheat, barley, etc. Occasionally damages sesame, citrus, etc. Damage characteristics: adults and nymphs pierce and suck sap on rice leaves and leaf sheaths, inhibiting the growth and development of damaged plants, causing leaves to turn yellow or the whole plant to wither.
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What are the control methods for the rice leaf roller?
Rice leaf rolling is caused by the rice skipper and the rice leaf roller. For controlling the rice leaf roller, 34% profenofos-fluorine emulsifiable concentrate is a new-generation insecticide. This product is a new compound ultra-long-acting insecticide with a broad insecticidal spectrum and stable efficacy. Field trials show that spraying 50 ml per mu diluted in 40 kg of water, with a treatment interval of 23 days, achieves a control effect of over 95%, requires 2 fewer applications than conventional pesticides, reduces pesticide cost by more than 50%, and can save 2/3 of labor, truly delivering labor savings, cost reductions, and improved quality and efficiency.
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Key Technical Points for Planting Birchleaf Pear Rootstock Seedlings in the Rainy Season
Birchleaf pear (Pyrus betulifolia) is an excellent rootstock for grafting pear cultivars, being drought-resistant, cold-resistant and tolerant of poor soil. It is generally planted in spring and autumn, but in remote mountainous areas short of water, the difficulty of transporting water and spring drought often affect the survival rate of planting. Fruit growers in our region have experience with planting birchleaf pear rootstock seedlings in the rainy season, which gives a high survival rate, rapid orchard establishment and low cost. The specific methods are as follows. 1 Plant after the continuous rainy season arrives, when the underground water content is close to saturation; planting in the rain or rushing to plant before the rain is best. 2 Dig up birchleaf pear sucker seedlings from nearby hillsides; generally a seedling diameter of 0
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How to prevent and control bacterial leaf spot in geraniums?
Geranium, also known as zonal geranium, fish geranium and horseshoe geranium. Native to South Africa. It prefers cool conditions, fears high temperatures, and is not cold-tolerant either. It requires ample sunlight. It is not tolerant of waterlogging but is slightly tolerant of drought, and prefers well-drained, fertile loam. In spring and autumn, when the weather is cool, conditions are most suitable for the growth of geraniums. In winter, indoors at around 15°C during the day and no lower than 5°C at night, with sufficient light maintained, they can bloom continuously. In hot summers, the plants enter a dormant or semi-dormant state, so they should be placed in partial shade and watering should be carefully controlled. It is resistant to chlorine. Plants of the genus Pelargonium are important potted flowers. Cultivation is extremely
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How to prevent and control bacterial leaf spot in geraniums?
Geranium, also known as zonal geranium, fish geranium, and horseshoe geranium. It is native to South Africa. It prefers cool conditions, fears high temperatures, and is not cold-tolerant. It requires ample sunlight. It is not tolerant of waterlogging but is slightly tolerant of drought, and prefers fertile loam with good drainage. In spring and autumn, when the weather is cool, it is most suitable for the growth of geraniums. In winter, indoors at around 15°C during the day and no lower than 5°C at night, with sufficient light, they can bloom continuously. In hot summers, the plants enter a dormant or semi-dormant state, and should be placed in partial shade with attention to controlling watering. It is resistant to chlorine. Pelargonium plants
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Identification and Control Methods for Geranium Alternaria Leaf Spot
Geranium Alternaria leaf spot is a common leaf disease of geranium. The pathogen has a wide host range and can attack many woody and herbaceous ornamental flowers, seriously affecting their ornamental value. Symptoms: In the early stage of the disease, chlorotic spots appear on infected leaves, and the lesions gradually expand to form larger circular spots. The spots are dark brown with concentric rings. In the late stage of the disease, a dark green mold layer appears on the spots, which consists of the conidia of the pathogen. Pathogen: The pathogen is Alternaria tenuis Nees, belonging to
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Causes and Control Methods of Pelargonium Leaf Curl Disease
Pelargonium leaf curl disease, also known as Pelargonium crinkle disease, is a viral disease that has only been found in the Shanghai area. Symptoms: The leaves of infected plants curl downward and become stunted. In severe cases, the plants die. Pathogen: The pathogen is Pelargonium leaf curl virus (PLCV). Disease pattern: The virus is transmitted by sap, grafting and soil; no vector insect has been found. In summer and autumn, the symptoms of the disease are not obvious, and the residual virus-carrying plant debris from pruning can spread the virus.
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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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What is leaf curl disease in geranium viral diseases
There are many types of geranium viral diseases. The following common ones are mainly distributed in Europe and the Americas, with a few reports also in Asia. Geranium leaf curl disease is also known as geranium crinkle leaf disease. [Pathogen] Pelargonium leaf curl virus (Pelargoniumleafcurlvirus, PLCV), thermal death point 85-90°C. [Symptoms] Chlorotic spots appear on young leaves, then develop into yellow round or star-shaped spots with a dark yellow center and a pale halo around them, along with necrotic perforation
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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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