I. Technical measures for pre-sowing wheat seeds for seed dressing The prevention and control of autumn sowing dates can play a multiplier role in controlling wheat pests. Wheat seed dressing main control objects: 1, soil-borne diseases, mainly sheath blight, total erosion, root rot. These germs can survive in the soil for many years, and the germs can infest when seeds start to germinate after wheat dressing. 2. The system infects diseases, including smut smut, scattered smut, and smut. The germs invade the growing point from the seed germination, and are systematically infected with the growth of wheat plants. Heading performance symptoms. 3, underground pests, mainly cockroaches, cockroaches and golden needles, they eat wheat roots and stems in autumn and return to green, resulting in lack of seedlings broken ridge. According to the survey, the underground pests of wheat occur every year in the city, and the former crops are mostly dry crops such as corn, peanuts, and sweet potatoes. The food is abundant, which is conducive to the occurrence and reproduction of underground pests, and is widespread and serious. The method of seed dressing is:
1. Prevention and Control of Underground Pests Mixing wheat seed and treating soil before sowing is the most effective measure to prevent and control wheat underground pests. Seed dressing treatment: For the general area of ​​the underground pests, the methods of seed dressing can be used for prevention and treatment. 50% phoximite seed dressing can be used, according to 0.2% of the seed amount, that is, 100 gram seed medicine 100 grams, 2-3 kilograms of water, also available 48% chlorpyrifos EC 0.3% seed weight seed dressing, after mixing Boring 4-6 hours can be sown, can effectively control the underground pests. Treatment of soil: Soil pests in severe areas should be treated with soil treatment and seed dressing. Soil treatment can be applied to the ground with 3% phoxim granules in an amount of 2 to 2.5 kg and then transferred to soil. . Mu can also use 50% of phoxim EC 250 ml, 1-2 kg of water, mix fine soil 20-25 kg made of toxic soil, evenly spread on the ground, and then turned into the soil.
2. Prevention and control of diseases such as head smut, full-bleeding disease and powdery mildew etc. The use of chemical seed dressing not only can prevent wheat smut, but also can effectively control the occurrence and damage of wheat rust, full-bleeding disease and powdery mildew before winter. , reduce the amount of wintering bacteria.
(1), scattered smut, smut, root rot, sheath blight, full-bleeding and other areas, available 40% pentachloronitrobenzene dry weight mix according to the weight of 0.5% wheat ( That is, 40 grams per acre, mix wheat about 8 kg), control wheat smut; can also choose 6% tebuconazole (Li Kexiu) a bag of suspension (10 ml), add water 0.8-1 kg, seed dressing 50 -70 pounds, or 2.5% fluoprionitrile (Closure) Suspension Seed dressing of wheat seed at the recommended dose, and simultaneous treatment of autumn rust and powdery mildew; 15% triadimefon wettable powder at 0.2% seed weight Or 20% triadimefon EC 1 kg water 5 kg, mixed with wheat 500 kg, can control powdery mildew, leaf rust.
(2) In areas where wheat is fully eroded, it is possible to use 12.5% ​​thifluzamide (completely etched) as a suspension agent for seed treatment, which has a good control effect on wheat whole rot disease. Normally use a full net net of a bag (20 ml), first mix with 300-500 ml, mix 20-25 pounds of seed, mix and suffocate for 6-12 hours (it is good for the drug to play and kill the germs of the seed) After soaking in the shade, sow.
(3) In wheat yellow dwarf disease and bushy dwarf disease areas, imidacloprid can be used to treat seeds, prevent and control insects, control the occurrence of wheat yellow dwarf disease and bush dwarf disease, and simultaneously treat underground pests.
(4) A variety of disease and pest mixed areas should be promoted by applying a seed coating agent or a seed dressing agent compounded with fungicides and insecticides for coating or seed treatment. All local areas should be based on the main types of pests and diseases, select the appropriate formulation of seed coating agents or seed dressings, the amount of which is generally compounded (mixed) agent in a single dose of active ingredients and used alone.
3. Advocating the use of coated seed Seed coating is a seed treatment technology that combines disease prevention, pest management, and disinfection as a whole. It not only avoids pests and diseases, but also provides nutrients and traces that are beneficial to the development of seed coating agents. Elements and plant growth regulator components, and all coated seeds also have the role of germination, rapid emergence, growth and development, improve quality, increase production.
II. Precautions for seed dressing of wheat before sowing:
It is an effective measure to prevent and cure a variety of diseases and insect pests and ensure the complete seedlings and seedlings of wheat. However, if wheat seeds are sown before planting, if they are not properly prepared, they will not only fail to prevent disease and insects, but also may cause slow emergence of wheat and poor emergence, and even affect the normal growth of wheat. Under normal circumstances, the following points should be noted in wheat seed dressing before sowing:
1. Determine the type of medicine according to the situation of the disease in the area where the disease occurred. If the occurrence of wheat seedlings in the local area is very light and the disease is severe, only the fungicides can be used for seed dressing, and pesticides do not have to be used. If pests and diseases are mixed, they must be mixed with insecticides and fungicides. If the soil pests are heavy, the seed dressings can not achieve the expected control effect, and seed dressing and soil treatment methods should be adopted to prevent and control wheat pests.
2, accurately grasp the amount of pesticides. Prevention and control of wheat underground pests, can be used 50% of phoxim EC, prevention and control of wheat aphid, total erosion, powdery mildew and sheath blight and other diseases, can be used 15% of triadimefon wettable powder and 6% of Rikenxi suspension mixture Wheat seeds. Some farmers use “estimate†medication when dressing wheat seeds, blindly increasing the amount of medication. Practice has proved that if wheat is used with Triadimefon, Phoxim and other pesticides, if the amount is too large, it will cause obvious phytotoxicity to wheat, which will cause the emergence of wheat to be delayed, and the growth will be slow. In severe cases, it will even appear to lack of seedlings, so it should be particularly note.
3, pay attention to seed dressing methods. For wheat seed dressings such as phoxim, the pesticides should be diluted with water first, and then mix well with the wheat seeds to cover the stuffy stuff and sow the seeds. Wheat is dressed with quintozene, triadimefon, and Rickettsia. The seed should be sprayed with water until it is moist, and then the agent is evenly mixed on the seed, and then immediately sown or dried after sowing. If it is necessary to use insecticides for seed dressing and seed dressing with fungicides, insecticides should be mixed first, and then mixed with fungicide, and then immediately sowed.
4, with the broadcast with the broadcast, not long home. After wheat is seeded with insecticides, it is usually 2-3 hours for up to 5 to 6 hours. The seeds are sown immediately after being absorbed by the wheat seeds. Generally, after wheat is sterilized with a fungicide, it should be immediately sown or dried immediately after being dried. Some peasant households spend a long time boring after wheat seed dressing, or they will not broadcast after dressing for a long time, which will also cause phytotoxicity to wheat. If wheat is spread in the sun after dressing with fungicides, the disease prevention effect will be significantly reduced.
5, it is necessary to strictly follow the seed dressing operation procedures to prevent human and animal poisoning, it is best to implement uniform seed dressing.
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