The tip of the flag leaf of rice is whitish, and it is suspected that it has bacterial blight. What are the symptoms of rice bacterial blight and what medicines are used to prevent it?
Bacterial blight of rice is a bacterial disease. The pathogen is Xanthomonas oryzae. The pathogens mainly damage the leaves. The symptoms include leaf margin type, acute type, withered type, midrib type, and yellow type. The leaf margin type is the most common, initially with dark green short-line spots at the leaf margins or tip, followed by grayish white long strips along the sides or midrib of the leaf margins, and the edges have more pronounced irregular wavy patterns. The acute type of disease is chlorosis or dark green, with rapid loss of water, curling inwards, and blue-green, generally limited to the upper leaves and not spreading to the whole plant. Withered type, also known as dry heart type, the beginning of the heart leaves dehydration blue and dry, withered yellow withering, the other leaves still remain green. In the midrib type, the middle part of the midvein of the leaf initially shows a pale yellow stripe, and then expands into a yellowish long stripe up to the tip of the leaf sheath. Yellowing type, early onset heart leaves do not die, only visible irregular chlorotic spots, then expanded to large yellowish lesions, sometimes dark green spots at the base of diseased leaves.
Bacterial blight lesions in the air when wet, the morning dew before drying can see honey yellow viscous fluid discharge, known as "bacterial pus", there are a large number of bacteria, dry and become yellow and white fish-like small particles Adhere to rice leaves. If this phenomenon can be detected in the field, it can be determined as bacterial blight. Bacterial blight of rice is popular at temperatures ranging from 25 to 30°C and relative humidity of 85% or more, and it is popular with rain, lack of sunshine, and frequent windy days. Guanyun County had more rainy days at the end of August and the beginning of September, with winds of 3 to 4 ranks and sometimes winds of 5. This weather condition is beneficial to the occurrence of rice bacterial blight. The suitable drugs for controlling rice bacterial blight include thiazolyl, thiazolium zinc, basic copper sulphate, thienson copper, thiena copper, copper citrate copper acid, mesitectin, octomycin acetate, etc. The emergence center of paddy fields immediately used drug control, and the perennially susceptible areas were promptly treated with drugs after typhoon storms.
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