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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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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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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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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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Symptoms and Control Methods of Carnation Leaf Spot Disease
There are many types of pests and diseases that harm carnations, and unsuitable cultivation environments and management mistakes can both aggravate pests and diseases. Carnation leaf spot disease, also known as carnation white star disease, can harm many flowers of the Caryophyllaceae family. [Pathogen] Septoria dianthi Desm., belonging to the fungi Deuteromycotina, genus Septoria. [Symptoms] The disease harms leaves and stems. Nearly round small spots form on leaves and stems, with a diameter of about 5 mm; the spots are light brown with purple edges,
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What is the fungal leaf spot disease of cut-flower carnations?
Symptoms: purple round spots 0.5-1.5 cm in diameter, surrounded by a yellow-green margin; the centers of the spots then turn brownish-gray and dry out, and finally the lesions enlarge, black spores appear, and the leaves begin to yellow and drop. Causes: watering from above the plant, poor ventilation, excessively high humidity at night, and overwatering and overfertilizing after planting are also among the causes of the disease. Control methods: keep the plants as dry as possible, preferably use drip irrigation, and maintain good ventilation. Use 1% Bordeaux mixture or 75% chlorothalonil wettable powder at 500 times dilution,
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What are the control methods for Dianthus leaf spot?
Identification points: Dianthus leaf spot mainly affects the leaves. Leaf spots are initially yellow, gradually becoming dark brown round to oval spots, and later the spots turn grayish brown with dark brown edges; in severe cases the spots join together, causing the leaves to turn yellow, wither and drop early. Under humid conditions, many small black granules appear beneath the spots, namely the conidia and conidiophores of the pathogen. Occurrence characteristics: a fungal disease. It can occur year-round in greenhouses. Under conditions such as abundant rain, heavy fog and heavy dew, the disease occurs easily. Poor ventilation and light transmission, extensive management and weak plant growth can all
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How to prevent and control rice bacterial leaf streak?
Rice bacterial leaf streak, or fine streak disease for short, is a bacterial disease caused by the genus Xanthomonas and is one of the domestic plant quarantine pests. High temperature and high humidity favor the onset of the disease; when this coincides with heavy rain, hail or flooding, causing numerous wounds on the leaves, the disease spreads extremely easily. Long-term deep water irrigation as well as excessive and late application of nitrogen fertilizer also make the disease more severe. In mild cases, yield is reduced by about 10%, and in seriously affected fields the yield loss can reach 40%-60%. Damage characteristics: Rice bacterial leaf streak mainly infects the leaves; the lesions initially appear as dark green, water-soaked, semi-transparent
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Detailed Cultivation Techniques for Leafy Goji in Protected Culture
Leafy goji, also known as goji shoots, goji berries, goutdiya, digupi, etc., is grown for its tender stems (young shoots), which can be eaten cold-tossed or stir-fried, and can also be used in soups or as a hot pot ingredient. The key cultivation techniques are as follows: 1. Cutting propagation: Because leafy goji is continuously harvested for its young shoots, it generally does not flower or set seed, so cutting propagation is mostly used. ① Cutting time: Take cuttings for seedling production in open ground or protected culture in August-September. ② Selection and treatment of cuttings: Select disease-free, robustly growing plants, take branches that are 1 year old, 0.5-0.8 cm in diameter,
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Key Technical Points for Protected Cultivation of Leafy Goji (Vegetable Goji)
Every 100 grams of tender stems and leaves of goji contains 5.8 grams of protein, 1.0 grams of fat, 6.0 grams of sugar, 3.96 milligrams of carotene, 0.23 grams of thiamine, 1.1 milligrams of nicotinic acid, and 3.0 milligrams of vitamin C. Regular consumption has health benefits such as improving eyesight, nourishing yin and moistening the lungs, enhancing immune function, and anti-aging. Consumers in southern China are accustomed to using goji tender stems and leaves in soups or stir-fries, and there is considerable demand in some cities; Guangzhou alone has an annual output of about 70,000 tons. Introducing vegetable goji for protected cultivation in the north can both enrich the variety of vegetables
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