Occurrence and Prevention and Control of Shantou Disease
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The taro disease is a fungal disease. The disease usually occurs during the annual rainy season and during the midsummer, and its symptoms occur first in the leaves, gradually spreading to the petioles and bulbs, and then rapidly expanding and spreading to form large round-patterned spots. If the leaves occur, the dorsal rachis spot is the most obvious, with conidiospores on the periphery of the spots, showing white moldy, and the lesion gradually decays and breaks up until the leaves remain only the main vein, like a broken umbrella; Occurs in the petioles, often forming dark brown, long oval lesions, yellowing the leaves and petioles until withering; if they occur in the bulbs, it will cause the entire skull to rot and even destroy. Therefore, the growers should thoroughly inspect the fields. Once the lesions are found, they must immediately take measures to eliminate the disease at the initial stage to prevent the spread of the disease. 1. Prevention and control of agricultural measures 1 Use uncultivated alfalfa when planting 2 Rotation is forbidden, and continuous cropping is prohibited for more than three years Implement crop rotations with rice, corn, peanuts, sugar cane, etc. 3 Increased application of P and K fertilizers and farm organic fertilizers to promote solid and thickening of leaf and petiole tissue cells and enhance plant resistance to disease 4Strengthen field management, timely drainage and drainage in the rainy season to prevent waterlogging in paddy fields 2. Chemical control Tawny blight usually occurs during the rainy season and during the midsummer, especially when it is hit by white water (also known as falling water). It is most susceptible to diseases during the sunny and rainy summer and high temperatures and humid summers. Once the disease center is found, the pesticide is immediately applied. Prevention The main agents are: 1 spraying Bordeaux mixture Its production method is: each 25 kg of copper sulphate, lime and turpentine, dissolved with a small amount of water and mixed together, and then added 75 kg of water to spray the entire field, spray once every 7 to 8 days, continuous spray 2-3 times, Control effect can be more than 90% 2 Apply 1000 grams of Dixon to the plants. Apply 110 kg per acre. Sprinkle once every 10 to 12 days. Apply 3 to 4 times continuously to effectively control the occurrence of the disease. 3 Uses Zhuang Zhuang Su 80 ml GTO Bujin 100 g, 55 kg water spray control has special effects