Detailed Guide to Identifying Rice Yellow Leaf Disease Symptoms
How do you identify rice yellow leaf disease? Please note that rice yellow leaf disease can be identified by the following methods: 1 Bacterial leaf blight yellowing. It spreads from bottom to top, and diseased leaves turn yellow to blighted white. After infection, dark green spots first appear at the leaf tip or leaf margin, then become yellow elongated lesions. The boundary between diseased and healthy tissue is distinct, like a wave pattern...
How do you identify rice yellow leaf disease? Please note
Rice yellow leaf disease can be identified by the following methods:
1 Bacterial leaf blight yellowing. It spreads from bottom to top, and diseased leaves turn yellow to blighted white. After infection, dark green spots first appear at the leaf tip or leaf margin, then become yellow elongated lesions. The boundary between diseased and healthy tissue is distinct, like a wave pattern. In the later stage, small round bacterial ooze appears on the leaf surface. Cut off a leaf, clamp it between two pieces of glass, drip clean water on it, and smoky bacterial matter oozes out.
2 Yellow dwarf disease yellowing. It first affects the top leaf and the 1-2 leaves below it, spreading upward and downward, then gradually develops until the whole leaf turns yellow or becomes mottled mosaic. The plant becomes stunted with shortened internodes, the leaves droop and lie flat, there are many black roots and few new roots, and the plant often rolls longitudinally, turns yellow, withers and dies.
3 Physiological premature aging yellowing. It spreads from bottom to top. Diseased leaves mostly appear orange-yellow with a metallic luster, occurring in patches or across the whole field. There are no lesions and no bacterial ooze on the yellow leaves.
4 Fertilizer damage yellowing. Improper application of ammonium bicarbonate, ammonia water, pesticides, and other substances can cause poisoning, turning blocks and patches of rice leaves bright yellow or golden yellow, and sometimes the yellow leaves have scorched spots.
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