As the temperature continues to rise, the occurrence of wheat pests and diseases is becoming more and more serious. If it is not timely and effective, it will cause serious damage to wheat, resulting in losses such as reduced production. In order to better guide the demonstration households to timely and effectively control wheat pests and diseases, the county wheat expert group has mastered a large number of first-hand data through several field investigations, and formulated scientific prevention methods according to the characteristics of different pests and diseases. These methods are issued to demonstration households to guide field production. First, wheat disease In recent years, although the occurrence of wheat diseases in our county is not very serious, it has a trend of increasing year by year. In addition, the lack of awareness and technology of disease prevention and control by the majority of farmers has caused the disease to occur more seriously in certain plots, greatly reducing the quality of wheat. It has caused great losses to wheat production, so we should pay full attention to the prevention and control of wheat diseases. The most serious wheat diseases in our county are: wheat powdery mildew, wheat stripe rust and wheat leaf rust. The following describes the various diseases separately. 1. Wheat powdery mildew: Wheat powdery mildew is one of the important diseases on wheat. It occurs in different degrees in our county, mainly affecting wheat leaves, and also harming stems and ears. In general, the lower blade is more than the upper blade, and the back of the blade is more than the front. It seriously affects photosynthesis, causing normal metabolism to be disturbed, causing premature aging and loss of yield. Control method: Chemical control First, the plot of autumn seedlings is heavy. It can be mixed with 0.03% (active ingredient) of powder rust or 0.015%-0.02% of hydroxy rust, or 75% of rust rust 150 100 grams of 100 grams of wheat or 100% rust. Second, in the autumn or spring, when the field incidence rate is 3%-5% (in the adult stage, the incidence rate is calculated from the flag leaf to the 2 leaves under the flag leaf), 20% or 15% of the 20% rusting emulsifiable concentrate per acre. 5 grams of rust WP, spray 50-60 kg of water, or 10-15 kg of water for low volume spray. It is also possible to use 25% of the pest emulsifiable concentrate of 50 ml per mu, add 50 kg of water, and spray evenly. 2, wheat stripe rust: wheat stripe rust, commonly known as jaundice, mainly damage to the leaves of wheat, but also harmful leaf sheath, stem and ear. After the wheat is susceptible to the disease, it initially shows a greenish spot, and then forms a yellowish pink sore (ie, the summer spore heap). Control methods: l. Select resistant varieties to use disease-resistant and high-yield varieties, and make rational layout of rust-resistant varieties. 2. Eliminate the local early bacterial source wheat stripe rust from the beginning of autumn seedlings to the second spring of the epidemic, to go through a long period of time, when the disease center is easy to check, early removal of diseased leaves buried deep, and use of pesticides Spray the wheat seedlings within 1 to 3 meters. 3, strengthen cultivation management in areas where autumn seedlings are easy to occur, should avoid premature sowing; rational fertilization, avoid excessive application of nitrogen fertilizer too late, and appropriate application of phosphorus and potassium fertilizer, promote wheat growth and development, improve disease resistance. 4. Chemical control During the jointing stage of wheat from heading to heading, when the diseased leaf rate reaches 1%, the first pass should be sprayed, and then sprayed once every 7-10 days. The medicine can be used with 20% powder rusting emulsifiable concentrate 30-50 ml per mu, or 15% powder rusting wettable powder 53-66 grams per acre, or 12.5% ​​quick-keeping WP syrup 15-30 grams per acre, or 25% pest emulsifiable concentrate 50 grams per acre, 50-60 kilograms of leaf spray on water. 3, wheat leaf rust: leaf rust is second only to stripe rust, but its occurrence is more common than stripe rust. The main factors affecting the prevalence of leaf rust are the number of wintering bacteria sources, the amount of spring rain and the temperature after entering the spring. Among them, the temperature and rainfall in the spring from late March to early May are the most critical. Control methods: l. Agricultural measures are selected to improve the leaf rust; after the wheat harvest, the self-produced wheat seedlings and weeds are eliminated in time to reduce the source of the summer bacterium. 2. Chemical control refers to the control of wheat stripe rust. Second, wheat pests 1. The occurrence law and control method of wheat aphids The species that occur in wheat aphid are mainly wheat long tube, wheat birch and wheat tube, all of which belong to the family Homoptera. All wheat areas in the country have occurred. At the beginning of the victim, there were yellow spots, followed by streaks, withered, and the whole plant became dry to death. Under normal circumstances, wheat bran often occurs in the case of warm winters and less precipitation in October or April to May of that year. The irrigated land is generally lighter than the dry land, and the fertile wheat field is generally lighter than the poorly fertile wheat field. Control method: Datian application, 50% anti-Converse WP can be used 5-7 grams per acre, or 40% dimethoate or omethoate emulsion 50 ml, or 90% Wanling powder 8-10 grams, or 25% 50 ml of worm-like emulsifiable concentrate, which is good in anti-èšœå¨, and does not kill natural enemies. It is preferred. 2. The pathogenesis and control methods of the wheat leaf bee Wheat leaf bees, also known as small armyworms, worms, etc., are widely distributed. Wheat leaf bees use larvae as damage to wheat leaves, biting inward from the edge of the leaves to form nicks, and heavy ones can eat all the wheat leaves. The adult life span is 3-7 days, and the egg period is 10 days. The larvae are 5 years old, and the leaves are harmful during the daytime at the age of 2-2, and concealed during the day after 3 years of age. In the middle and upper part of May, the mature larvae will enter the soil for dormancy until mid-October. The larvae are suspended, and they fall to the ground when they are vibrated. 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