Identification of several diseases in rice

First, a few yellow leaves 1. Yellow bacterial leaf blight. Spread from the bottom up, the diseased leaves yellow to dry white. After the victim suffered a dark green spot on the edge of the leaf tip or leaf, followed by a yellow long stripe lesion. Late in the leaf surface of Pesculex glue. Cut the blade, sandwich it with two pieces of glass, add fresh water, and smoke-like bacteria emerge. 2. Yellow dwarf yellow leaves. From the parietal lobe and the next 1 or 2 leaves, the disease spreads upward and downward, and then gradually develops to the entire leaf yellow, or becomes a mottled mosaic, the plant short dwarfing short, the temporal lobe sagging flat, Heigenuo The new roots are few, and they are often left to die. 3. Physiological premature aging yellow leaves. Spread from the lower to the upper, the diseased leaves are mostly orange-yellow, have metallic luster, and occur in patches or all fields. There are no lesions on the yellow leaves and no pyomesus. 4. Fat yellow leaves. Inappropriate application of ammonium bicarbonate, ammonia, pesticides, etc., can cause poisoning, resulting in a piece of rice leaf smoked into a bright yellow or golden yellow, sometimes with yellow spots on the burn. Second, several kinds of leaf spots 1. Rice blast leaf spot. When rice leaves develop, the acute type, the spot starts with dark brown spots, becomes oval afterwards, leaves pale with gray moldy, chronic type, lesions become fusiform, next to reddish-brown, central grayish white There is a brown line running through the middle of the lesion. When wet, there is a gray mold on the back of the lesion. 2, flax leaf spots, lesions like small needles at the beginning, after the gradual formation of oval spots, the shape of sesame seeds, thick spots to see the dark brown, darker than rice blast. A closer look at the color is divided into three layers: the outer edge of the yellow halo, the edge layer is wide, dark brown, the center is mostly gray and yellow. Features: The dark brown part of the lesion looks to the light and often hides the thin ring veins. There are no necrotic lines on both sides of the lesion. 3. Brown spotted leaf spot. The disease began at the midrib of the base of the leaf and stretched upwards and downwards, resembling brown stripes. The disease department broke off the milky white sap, and the diseased plant was severely rotted. A rancid smell occurs. The dead leaves are dead, and the heart leaves dead in the heart and become dead. Third, several blight 1. Pediococcus tick green citrus. The field often grows into clusters, and there are also a few strains in the disease. The basal tissues of rice plants are soft rot and have dark brown spots. The most recognizable feature is the peeling of the base leaf sheaths and stalks. There are many black sclerotia that are smaller than leek seed. 2. Bacterial base rot green orange. Occurrence sporadically in the field occurred in 1 to 3 strains of 1 point, and the base of the diseased plant showed gray rat rotting. Features: Peel off base stalk, filled with stinky water, sterile core. 3. Physiological blue and dry. The rice stem stalks shrink, and the stems of the stems of the rice stems are dry and easy to fall down. The shape of the rice stems is damaged by the nucleus of the brown planthopper. However, stem basal body worms, no lesions, aseptic nucleus in leaf sheaths and stalks, mostly occurred in the late rice ripening period, and the lumps became blue and wilted. Fourth, several dry heart 1. Locust dead heart. The lower part of the rice plant has wormholes or insect feces, and the dead heart is easy to pull up. 2. It hurts the heart. The stems of rice plants have no wormholes and no insects. The dead heart strains are easy to pull up and the stem base and roots are shredded. 3. Stripe leaf blight dead heart. The heart of the diseased plant had yellow streaks and was curled into a paper-like shape, and it bent down into a "false dead heart." The base has no wormholes, does not rot, and the dead heart is not easy to pull up. Five, several white spikes 1. Sanhua white clams. There are wormholes and insect feces in the upper part of the rice stems, and the white spikes are easy to pull up. The ear and neck are not affected, and the white spike group is obvious in the field. 2. Rice neck rice rickets white spike. There are no wormholes in rice stems, and the white panicles are not easy to pull up. There are dark brown spots in the panicle, cob, and branches. Spike neck or branches easily broken, when wet, the diseased parts of gray green hairy mildew. 3. White orange spikes. In the leaf tip, leaves or head, stems, stems, dark green spots appear initially, then expanded into an oval square lesions, lesions of brown edges, the middle light brown to grayish white. The basic organization is soft and white spikes are lying on the ground.

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