Seed coating knowledge

* Seed coating agent, as the name implies, is the agent that dresses the seeds. It is a seed treatment agent made from pesticides (insecticides, fungicides), trace elements, sustained-release agents, and film-forming agents and other active ingredients and additives.
Focus: (a) Nine physicochemical traits of seed coating agents ("Seed Processing Science Principles and Technology" 255-257). * Film formation time.
(B) General knowledge of pesticides and commonly used seed coating agents (is a special type of pesticide products)
1. * "Three Certificates" of pesticides: Refers to pesticide production permit, pesticide standards and pesticide registration certificate. The "three certificates" of pesticides are issued in units of products, that is, each pesticide product and the same pesticide product produced by different manufacturers have their own three certificates. Each commercialized pesticide product of each pesticide company must have three numbers of three certificates, three different certificates, or three certificates of other pesticide products, or fraudulent use of other certificates from other manufacturers. The scope of counterfeiting and counterfeiting is an illegal act. A pesticide product has three certificates, not according to the technical requirements stipulated in the three certificates, product quality can not meet the relevant requirements of the three certificates, the product is inferior and defective, resulting in adverse consequences, the manufacturer must bear legal responsibility.
2. Toxicity and lethality of pesticides (see Principles and Techniques of Seed Treatment, pp. 119-121)
3. Commonly-used pesticide ingredients in seed coating agents (see Principles and Techniques of Seed Processing Science, pp. 200-238)
* Active ingredient content and nomenclature of seed coating agent.
5 types of insecticides: phorate, methylisohexose, phoxim, gram and acephamide; fungicides: * non-absorbable fungicides 4: thiram, mancozeb, 100 Bacterial Chloride, Pentachloronitrobenzene; *9 Systemic Bactericides: Metalaxyl, Tolclofos-methyl, Carbendazim, Versitile, Seedling, Triadimenol (keto), Dexon Welfare double.
(1) Metalaxyl: Also known as Aplon, Rhizoctonia. This variety was developed in 1977 by the Swiss Ciba Gage. There is 35% seed treatment (ie Aplon). Low toxicity to humans and animals, acute oral LD50 in rats is 669MG/KG, mildew and disease in rats.
(2) Tolcadophos-methyl: This product was developed by Sumitomo Chemical Co., Japan and FBC, UK. Is a systemic fungicide. Low toxicity to humans and animals, the rat's acute oral LD50 5000mg/kg, rat acute dermal LD50 greater than 5000mg/kg, relatively safe for humans and animals. It has strong bactericidal activity against pathogens such as seedling blight and sclerotinia. Its strong sucking effect, not easy to lose, in the soil for a longer period of validity. 100kg cotton seeds are used 200-300g. It is also effective against quinophthalein to produce antibiotic blight.
(3) Triadimenol: Triadimenol, also known as trachymantin, bantam. In the study of the metabolism of triadimefon in vivo, Triadimefon was found to convert triadimefol in both pathogens and plants, and the tribendrazol has a higher bactericidal activity than triadimefon, resulting in triazole in 1977. Alcohol is developed as a commodity. The bactericidal spectrum of triadimenol is almost the same as that of triadimefon, which has protection, eradication, and therapeutic effects on the disease. Can kill the pathogen attached to the seed surface, but also can kill the pathogen inside the seed. Triadimenol is used to treat seeds. At very low doses, it has excellent control effects on crop seed and pathogens. It is an important feature of triadimenol, smut, root rot, and barley. , ooze scattered smut, 100kg seeds, with active ingredients 7.5g-15g (15% wettable powder 75-150g) treatment, wheat rust, 100kg seeds with 10% wettable powder 150-180g (ie active ingredients 15-18g) treatment. Triadimenol treatment of wheat seeds, similar to triadimefon, has a certain inhibitory effect on the growth of seedlings. Its inhibition strength is related to the degree of pesticide application, and is also much lighter than triadimefon, and does not substantially affect the middle and late stages of wheat. The growth and yield. The use of triadimefol in seed dressings to control corn and sorghum smuts is not stable, and fluctuations between the end of the year and the region are significant and should not be used.
4, commonly used seed coating agent (see materials 81-83 pages).
* (1) 17% coating agent No. 17 (17% polyhydric alcohol)
1 Main components: carbendazim 11.2, carbofuran 4.3%, triadimenol 1.5%, total pesticide content 17%. Trace elements and rare earth metals are 3%, which is a medicinal fertilizer compound agricultural agent.
2 Scope of application: It is mainly used for the coating of wheat seeds.
3 Roles and prevention targets: A comprehensive prevention and control of wheat underground pests and smut, sheath blight, powdery mildew, early stripe rust and other seedling disease. B. Improve the quality of seeds, provinces, provinces, provinces, seedlings, seedlings, seedlings. C. Prevention of deficiency of the disease. D promotes fertility and increases production.
4 Coating dosage: 0.325g of active ingredient per 100g of seeds, calculated according to the amount of commercial products, seeds per package of 53kg can be packaged with 53kg of seeds, that is, drug-to-species ratio of 1:53 and pharmacology of 1.89% of seeds.
5 coating methods; * Seed selection to reach the following quality indicators: the degree of clarity is more than 98%, the germination rate is more than 85%, the moisture is not more than 13%. Two coating methods can be used, one using a seed coater for mass coating. Follow the machine operating instructions. Second, artificial coating can be used when the amount of seeds is small (teaching materials, 86 pages).
6 Note: Teaching material 87-89 pages.
(2) 20% seed coating No. 19 (20% Kefu seed coating agent)
1 The main components: Carbofuran 10%, Fumei pairs 10%, total pesticide content 20%, trace elements 4%, for the medicinal fertilizer composite seed coating agent.
2 Scope of application: This model is suitable for the coating of corn seed and the seed coating of corn seedlings in the plains where there are corn stem rots, such as the Yellow River, the Yangtze River Valley and the Northeast.
3 Roles and prevention targets: A. Comprehensive prevention and control of corn underground pests and aphids, thrips, nematodes, and stem base rot caused by Fusarium and Pythium. B. Improve seed quality, commercialize seeds, and standardize. C. Provincial species, provincial medicine, provincial labor, Miao Qi, Miao Quan, Miao Zhuang. D. Prevention of deficiency diseases. E. Promote crop growth and increase production.
4 Coating dosage: 0.4-0.5g of active ingredient of pesticide per 100g of seeds. Calculated according to commercial quantity, 40-50kg of seed can be packaged per kilogram of seed coating agent, that is, the ratio of drug to seed is 1:40-50, and the dosage is the amount of seed. 2-2.5%.
5 Coating method: After the seed is selected, the following quality indicators are achieved: the clarity is more than 98%, the germination rate is more than 86%, and the moisture content is not more than 13%. Two coating methods are available, one using a seed coater for mass coating. Follow the machine operating instructions. Second, artificial coating can be used when the amount of seeds is small (teaching materials, 86 pages).
6 Precautions: Textbooks 87-89.
(3) 30% seed coating No. 22 (20% g)
1 Main components: Carbofuran 20, carbendazim 6%, metalaxyl 4%, total pesticide content 30%, trace element 4%, is a medicinal fertilizer complex seed coating agent.
2 Scope of application: It is mainly used for the coating of millet.
3 Roles and prevention objects: A comprehensive control of millet subterranean pests and seedling pests and diseases such as white disease, smut, gluten disease, nematode disease and insect transmission virus disease, such as red leaf disease. B. Improve seed quality and commercialize and standardize seeds. C province, provincial medicine, labor, Miao Qi, Miao Quan, Miao Zhuang. D prevention of disease. E promotes the growth and development of crops and increases the yield. Generally, it can increase production by more than 10%.
4 coating dosage: Each 100g seeds need pesticide active ingredient 0.5g, calculated according to the amount of goods, seed coating agent per kilogram can be packaged 60kg seed, that drug ratio 1:60, dosage is 1.7% of the seed amount.
5 coating method: After the seeds are selected, the following quality indexes are achieved: the clarity is more than 98%, the germination rate is more than 85%, and the moisture content is not more than 13%. Two coating methods are available, one using a seed coater for mass coating. Follow the machine operating instructions. Second, artificial coating can be used when the amount of seeds is small (teaching materials, 86 pages).
6 Note: Teaching material 87-89 pages.
(4) 25% seed coating agent No. 23 (25% Kadoo seed coating agent)
1 Main components: Carbohydrate%, carbendazim 3%, phorate 25%, total pesticide content 25. Zinc, molybdenum, iron and other trace elements 4%, for medicinal fertilizer complex seed coating agent.
2 Scope of application: It is mainly used for peanut seed coating in Hebei, Henan, Shandong, and other regions.
3 role and prevention and control objects: A integrated prevention and control of peanuts underground pests, nematode worms, thrips and so on. Indirect control of peanut virus levels through flood control. Prevention of peanut stem rot and bacterial wilt. B. Prevention of deficiency diseases. C promotes growth and development, increase production, generally can increase production by 10% -40%.
4 Coating dosage: 0.5-0.7g of active ingredient per 100g of seed, calculated according to commercial quantity, 36-50kg of seed per kg of seed coating, ie ratio of drug to drug 1:36-50, can occur according to pests and diseases in different places To determine the ratio of drug species, such as excessive use of drugs may cause phytotoxicity.
5 coating method: After the seeds are selected, the following quality indicators are achieved: the clarity is more than 98%, the germination rate is more than 75, and the moisture content is not more than 10%. Artificial coating (86 pages).
6 Note: Teaching material 87-89 magnetic.
(5) 30% seed coating agent No. 24 (30% ketamine seed coating agent)
1 The main components: Carbofuran 20%, carbendazim 5%, methamidophos 5%, methyl-rhizochlor 5%, total pesticide content 30%. 4% of trace elements, for drug fertilizer compound seed coating agent.
2 Scope of application: It is mainly used for the coating of direct seed cotton in the north.
3 role and control objects: A. Comprehensive control of millet underground pests and seedling pests and diseases such as aphids, thrips, anthrax, seedling blight, damping-off and so on. B. Commercialization and standardization of seeds. C. Provincial species, provincial medicine, provincial labor, Miao Qi, Miao Quan, Miao Zhuang. D. Prevention of deficiency diseases. E promotes the growth and development of crops and increases the yield. Generally, it can increase production by more than 10%.
4 Coating dosage: 0.7-0.5g of active ingredient per 100g of seed, calculated according to commercial volume, seed per package of 43-60kg per kg of seed coating, ie drug ratio 1:43-60, dose of seed 2.3%-1.7%.
5 coating method: the seeds need to be selected after the velvet coating, quality indicators: the degree of clarity is more than 99%, the germination rate is more than 80%, the moisture is not more than 12%. The residual acid rate is less than 0.15%, the mechanical damage rate is less than 2%, and the residual pile rate is less than 1%. One method of coating is to use a seed coater for mass coating. Follow the machine operating instructions. Second, artificial coating can be used when the amount of seeds is small (see textbook page 86).
6 Note: Teaching material 87-89 pages.
(6) 30% seed coating No. 26 (30% Coughford seed coating agent)
1 The main components: Carbofuran 20%, carbendazim 5%, Fumei double 5%, 30% of the total pesticide content, trace elements 4%, for medicinal fertilizer composite seed coating agent.
2 Scope: Mainly used for soybean seed coating.
3 role and prevention and control objects: A. Comprehensive control of soybean underground pests and seedling pests and diseases such as aphids, thrips, rooting fly, root rot, cyst nematode disease, double eyelid disease. B. Commercialization and standardization of seeds. C. provincial species, provincial medicine, labor, seedlings, Miao whole, Miao Zhuang. D. Prevention of deficiency diseases. E promotes the growth and development of crops and increases production. Generally, it can increase production by more than 15%.
4 coating dosage: Each 100g seeds need pesticide active ingredient 0.5g, according to the commodity is calculated, per kg seed coating agent can be packaged 60kg seed, namely drug species than 1-60, the amount of drug is 1.7% of the seed amount.
5 coating methods: seed selection after coating, quality indicators: the degree of clarity of more than 98%, the germination rate of 85% or more, water is not more than 12%. The coating method can be coated manually (textbook P86).
6 Note: Teaching material 87-89 pages.
(7) 13% fodor A seed coating agent 1 main components: total pesticide content 30%. Trace elements, medicinal fertilizer composite seed coating agent.
2 Scope of application: It is mainly used for coating rice and vegetable seeds.
3 Prevention and control objects: comprehensive prevention and control of rice seedling stage blight, cotton rot, bastard disease, rice blast and other diseases. Vegetable crops include anthracnose, blight, root rot, and other diseases. Both control deficiency deficiencies and strong seedlings.
4 coating dosage: rice 1:50, vegetables 1:30.
5 coating methods: seed selection after coating, quality indicators: the clarity of more than 98%, the germination rate of 85 or more, water is not more than 12%. The coating method can be coated by hand (page 86).
6 Note: This product has two kinds of soaking and non-soaking, seed soaking seed coating agent is suitable for soaking in the germination area rice seed coating, non-soaking seed coat should not be soaked, can be directly seeded, sowing time 2-3 day. Teaching material 87-89.
In addition, the use of Weifu and coated seeds has a small increase in water content. Apart from not controlling pests, there are four benefits. First, the cost is lower. Second, the use of drugs is small, and the water content of the coating seeds is small and can be achieved. The coating and metering process is mechanized and automated. The third is that foreign seed coating agents have extremely low toxicity and some are lower than salt (such as Weifu's acute lethal oral medium dose is 6250mg/kg, and salt's acute lethal oral medium dose is 3320mg/ Kg), for human and livestock safety, environmental pollution is small, four is a good quality of pharmaceuticals (such as Wei Fu four years without precipitation), uniform coating.
(8) Guardian 200FF:
1 main components: total pesticide content 40%,
2 Scope of application: Wide application range, mainly used for coating of wheat, rice, corn, soybeans, cotton, peanuts, rape, vegetable seeds.
3 Control objects: Weifu is a fungicide with both internal absorption and contact toxicity. After the seeds are coated, they are protected both inside and outside, and comprehensively prevent seedling disease, soil-borne diseases, and species-borne diseases. For example, in the fungus period, the control effect against blight, stem rot, anthrax, and damping-off disease is very good. Because of its internal absorption, it can also prevent other non-seedling diseases such as smut, smut, black embryo disease, leaf spot disease, and streak disease. Prevention of bad species. Control wheat rust and mildew.
4 coating dosage: 250-450ml/100kg seeds.
*5 Coating method: Seeds are selected after coating and the quality meets the national standard. Coating method, can be 1-4 times the water, so that the drug species in the ratio of 1:100 or so, in order to ensure uniform coating, available manual coating and mechanical, automated coating (teaching materials 86 pages).
(9) Shi Leshi:
In addition: (A) 15% Kefu Ketone (Carbofuran 7%, Fumei 7%, Triadimefon 1.2%), for wheat, drug species ratio 1:50-60, 120 million yuan / t. (B) 15% forododoxone (9% for thiram, 5% for carbendazim, and 1% for triadimefon) for cotton drug ratio 1:60, 150 million yuan/t. (C) 22.7% ketoketone (carbofurol 9.5%, carbendazim 12%, triadimefon 1.2%), for cotton, drug ratio 1:60, 150 million yuan / t. (D) 13% Ketoxone (carbofuran 11%, carbendazim 3%, triadimefon 1%) for corn, drug ratio 1:40-50.