Purple spot
Symptoms of this disease appear on the leaves, causing visible damage. The leaf spots are generally round or oval, ranging in size from 2 to 6 mm in diameter. The edges of the spots are purplish-brown with clear boundaries, while the center is yellow-white to yellow-brown, slightly sunken, and thin. In severe cases, some spots may develop into holes or perforations. When the infection is heavy, the lesions become dense and can significantly reduce the plant's productivity. The pathogen responsible for this disease is *Ramularia* sp., a type of spore-forming fungus that belongs to the Deinococcaceae class. This fungal pathogen thrives in warm and humid conditions, making it particularly prevalent in certain regions. Disease Characteristics: This disease is common throughout the year in southern areas, where conidia (asexual spores) are spread by wind, rain, or water droplets. There is no need for a winter survival phase in these regions. However, in northern areas, the fungus survives the winter in the form of mycelium and conidia, which remain in the soil or plant debris. In the following growing season, the conidia infect new plants, and the spores produced in infected tissues can be retransmitted through air currents and rain splash. Humidity plays a critical role in the development of the disease, and outbreaks are more likely after heavy rainfall during the growing season. Control Methods: 1. Plant Malabar spinach at an appropriate density to avoid overwatering. Regularly spray beneficial bacteria to promote healthy growth. Use products such as "Plant Treasure Prime" diluted at 7500 times, or apply 30–50 ml per 667 square meters to stimulate early plant growth. 2. Apply a mixture of 75% chlorothalonil wettable powder (diluted 1000 times) and 70% thiophanate-methyl wettable powder (diluted 1000 times), or 40% polysulfide suspension (diluted 600 times), or 50% mancozeb wettable powder (diluted 2000 times). Repeat the treatment every 7–10 days for 2–3 applications. Alternatively, use 27% high-fat film emulsion diluted 80–100 times, or Wu Yicin (B0-10) and 2% agricultural anti-120 water agent diluted 200 times. Make sure to stop applying chemicals 7 days before harvest to ensure safe consumption. Proper cultural practices, combined with timely fungicide application, are essential in managing this disease effectively and minimizing yield loss.
Black And White Ultrasonic Diagnostic Equipment
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