Maize big spot disease symptoms: The disease mainly damages the leaves. When the disease is serious, the sheath and the lobe are also affected. Generally, the disease starts from the bottom lobe and gradually expands upwards, starting from the middle and upper leaves. A greenish-type lesion or a wilt-type lesion occurs at the time of onset. A small oval-shaped yellow or grayish-blue water-soaked spot appears. The posterior edge of the vein expands and grows into a stripe-like spot, and later lesions change to a dark brown or yellow-brown color. Control methods: selection of resistant (resistant) varieties; large-scale rotation, timely treatment of diseased bodies (incineration, etc.); use of 50% carbendazim WP, 50% amidicarb WP, 40% ketamine powder Emulsion 500 times liquid or 60 to 80 units of kasugamycin are sprayed at the time of initial spraying and sprayed once every 10 days for a total of 2 to 3 sprays. Each sprayed liquid is 75 to 100 per 667 square meters (1 mu). kilogram. Symptoms of corn leaf spot: The main damage to the corn leaf, rare in the stem, temporal lobe, grain. The lesions are oval or spindle or nearly rectangular, gray-brown or tan. Control methods: selection of resistant (resistant) varieties; treatment of diseased bodies (incineration, removal of diseased leaves, etc.); use of 50% diureticin and 75% chlorothalonil 300 to 500 times solution or 40% ketamine 500 to 1000 The liquid or 40% of Formamide, 907, zeinzine, eutectic and other 500 times liquid and thiophanate 1500 times spray control. Symptoms of corn tumor smut: Near-ground base produces small nodules. When the disease is severe, young seedlings die. During the growth period, young tissues such as roots, leaves, stems, and ears can all be infected. After the jointing, the leaves became a series of dense bacteria and other parts scattered. Control methods: selection of resistant (resistant) varieties; treatment of diseased bodies (burning, removal of diseased leaves, etc.); spraying of herbicides before corn emergence. Corn smut symptoms: Dwarfed seedlings, shortened internodes, dark green leaves or yellow-white stripes. After heading, all the ears except the loquat leaf were destroyed and turned into bacillary dysentery. When mature, the temporal lobe opened and dispersed black powder with many filaments inside. Control methods: selection of resistant (resistant) varieties; rotation, removal of diseased and diseased plants, application of adequately decomposed organic fertilizers; use of 0.2% to 0.3% of seed weight of triazoles or 25% of triadimefon and oxyntrilin Wet powder, mix well with adhesive corn paste, then add seeds, dry immediately after sowing. Author: Xindu City Dongdu Town Government Agricultural Technology Station
with transverse stolons. Leaves 3-11; leaf blade ovate, slightly leathery; petiole glabrous. Scapes yellow-green, narrowly ovate, apical apex; petals nearly lanceolate, apex acuminate, Middle slightly widened, with honey groove; stamens long only about 1/2 of the petals; anthers yellow, filaments narrowly linear; style slightly curved. Oval oblong, carpels stalked puberulent. March-April flowering, April-June results. Specialty Chongqing pillars yellow water. Health elevation of 1600-2200 meters between the mountain forest, often cultivated, wild rare. Rhizome is a famous traditional Chinese medicine ("Coptis"), with berberine, Coptidis base, Coptis base, tetrandrine and other alkaloids, can cure acute conjunctivitis, acute bacillary dysentery, acute gastroenteritis, hematemesis, Embolism.
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