In the middle and late period of wheat, there are multiple periods of diseases and insect pests. It is particularly important to identify and control the symptoms and prevention techniques of wheat in the mid and late stages. Major disease symptoms and prevention techniques Stripe rust is commonly called "jaundice". There are three kinds of rust, leaf rust and rod rust. The main damage to the leaves, leaf tip and stem. In the case of spring and rainy weather, it is easy to become a pandemic. Light wheat grains are not full, and wheat plants that are heavy are dead. Generally, production is reduced by 20% or 30%. In severe cases, production is reduced by more than half. Control methods: When the diseased leaf rate in the field reaches 1%, spraying will begin. Can be used per acre 20% Trifenin EC 40 ml, or 15% triadimefon 80 grams, add water 30-50 kg spray control. Can also be used 10% oxazole powder, 100 grams per acre, add 30-50 kg of water for prevention and treatment. During the epidemic period, spraying once every 7-10 days, even spraying 2-3 times. After powdery mildew wheat was infested by powdery mildew, with the development of the disease, small yellow spots appeared on the leaves, and then gradually expanded to nearly round or oval lesions, the surface covered with a layer of white powdery mildew, late white powder The mold layer gradually turns from gray-brown to yellow-brown small round grains, which can cause dead and make the grain not full or even rot. Severely affected wheat plants are short and weak, and spikes that are not headed or extracted are short and small. Control methods: In the wheat earing and heading stage, the diseased rate in the field reaches 10%-20%, and 20% tetranerin EC is used per mu, 40 ml, or 10% oxazole alcohol powder is 100 g, and 30-50 kg water is sprayed to prevent and cure. Faba head wheat will be infected with head blight from emergence to maturity, causing seedling rot, stem rot and ear rot. Infected by wheat scabs during the flowering period of wheat, in the initial stage, brown water invading lesions appeared on the base of the spikelet or on the glumes, and white spikes and black granules emerged in the late stage, eventually causing the whole panicle or the ear to die. The performance is "dry white spikes." Control methods: Use 25% carbendazim WP for 150-200 g per mu, or 70% thiophanate-methyl wettable powder for 40-50 g per mu, add 30-50 kg of water, spray at the initial flowering stage, 5- Spray it once more in 7 days. Major pest symptoms and prevention techniques Wheat red spider is a common pest of wheat in the jointing stage. Adults and larvae consume wheat leaf sap, and the infected leaves are covered with yellow-white spots. After that, the spots merge into patches and the leaves become yellow. When the damage is serious, the wheat cannot be headed. Control methods: Use 20% potassium kyanhydrin emulsifiable concentrate or 10% cypermethrin cream 1000-1500 times spray control. After the wintering larvae of the midge, the larvae broke into the 3-10 cm soil layer in late March (wheat jointing period) to prepare the larvae. The emergence of the end of May begins. On the day of adult emergence, mating and spawning occurred. After larvae hatched, the larvae hatched into oyster shells and penetrated into the wheat grains. The damage is mainly caused by larvae during the grain-filling period of wheat, resulting in pods. Control methods: When the insect condition reaches the control index, the chrysanthemum insecticide can be used. Spray once every 7 days. Insect damages such as wheat aphid and armyworm appear at the booting stage of wheat aphid and armyworm wheat, which can lead to mature stems and white spikes in wheat. Control methods: Aphids can be used 15% 0 imidacloprid WP 1000-1500 times, or 20% fast kill Ling EC 20-30 ml per mu water 30 kg spray control. If there is a mixture of pests and diseases in wheat fields, insecticides and fungicides can be mixed and used, such as triadimefon, chlorpyrifos, and diflubenzuron, to treat powdery mildew, stripe rust, wheat aphid, and armyworm. RP International Ltd is top Gellan Gum Supplier and Manufacturer in China. Gellan Gum Gellan Gum,Suspending Gellan Gum,Low Acyl Gellan Gum,Thickener Gellan Gum RP International Ltd , http://www.rp-foodadditives.com
Gellan gum is a water-soluble anionic polysaccharide produced by the bacterium Sphingomonas elodea (formerly Pseudomonas elodea). The gellan-producing bacterium was discovered and isolated by the former Kelco Division of Merck & Company, Inc. in 1978 from the lily plant tissue from a natural pond in Pennsylvania, USA. It was initially identified as a substitute gelling agent at significantly lower use level to replace agar in solid culture media for the growth of various microorganisms .Its initial commercial product with the trademark as "GELRITE" gellan gum, was subsequently identified as a suitable agar substitute as gelling agent in various clinical bacteriological media.
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