Bacterial medication

Bacterial diseases of orchids: including leaf spot. Soft rot. Fusarium wilt and so on. Bacterial venereal disease shows great concealment in orchids. The onset of disease is quick. The characteristic of great harm. Once infected, a little moss, there is the possibility of destruction of the whole pot of orchids, especially the harm of soft rot is more serious, there is a lesson to talk about decay. How to deal with bacterial diseases, on the basis of prevention, to master early treatment. Treat it quickly. If you try your best to use the medicine, you will make a comeback and change your luck.

The technical requirements for the use of fungicides are higher than those of pesticides, so it is difficult to master. According to the effect of fungicides on disease control, fungicides can be divided into three types:

Protective fungicides: these fungicides can protect uninfected areas from pathogens, and spraying can only have an effect before crops come into contact with diseases or diseases, such as copper preparations (Bordeaux solution). Sulfur preparation (stone sulfur mixture), Dyson manganese, etc.

Eradication fungicides: this kind of agents can directly kill the bacteria before the invasion and treat the infected parts, often with disinfection effect. Such as using formalin to disinfect infected seeds.

Therapeutic fungicides: also known as endobiotic fungicides, these fungicides can prevent the development of germs in all parts of the plant after they are absorbed and transmitted by plants. Such as carbendazim, thiophanate, Chunramycin and so on.

Different kinds of fungicides are used differently.

Systematic protection at seedling stage: seedlings include seeds, roots, tubers, bulbs, cuttings, seedlings, seedlings and other organs for reproduction.

Chemical treatment of soil: belongs to overall or local protection, such as direct application of pentachloronitrobenzene in seedbed soil and so on. Irrigation and mixing methods can be used to deal with soil.

Foliar spraying: there are many dosage forms of foliar spraying, such as powder, micro-powder, wettable powder, EC, suspending agent, water agent, aerosol and so on.

Here are some germicidal drugs:

one。 New plant mildew toxin

Physical and chemical properties: neophytomycin preparation is a yellow-white odorless powder, easily soluble in water. Toxicity: low toxicity to higher animals. Dosage type: powder. Control object: this agent has a good control effect on bacterial leaf spot, bacterial blight and soft rot. Usage: to prevent and cure bacterial leaf streak, it should be used continuously for 3 times at the initial stage of the disease, and each time 10 million units (1 packet) of neophytomycin should be sprayed with 50 kg of water per 666.6 square meters. The seriously ill Orchid Garden was sprayed every 10-15 days for 5-7 times. To control leaf blight, 10 million units (1 packet) of neophytomycin were used for every 666.6 square meters at the initial stage of the disease, 50-75 kg of water was sprayed, and the second spray was carried out 10 days later. Seriously ill patients were sprayed again for 2 or 3 times. To prevent and cure soft rot, at the initial stage of the disease, 4000 times dilution of neophytomycin was sprayed. Note: (1) this agent should not be mixed with alkaline pesticides, agricultural antibiotics and organophosphorus pesticides. (2) when this agent is used, 0.1% neutral washing powder is added to the liquid, which can improve the control effect.

two。 Thiquazole

Chemical name of thioprozole: n-amino-methylene-bis (2-amino-5-mercapto-1, 3, 4-thiadiazole). Other names: Ye Qingshuang, Yekuzole, Chuanhua-018, Ye Kuning. Physical and chemical properties: thiumazole is slightly soluble in water and easily soluble in organic solvents such as dimethylformamide, dimethyl sulfoxide, pyridine, ethanol, methanol and so on. Toxicity: low toxicity to higher animals. Prevention and treatment object: thiumazole is a kind of internal absorption fungicide, which has protective and therapeutic effects. It is mainly used to control plant bacterial diseases, has a special effect on leaf blight, and has a certain control effect on bacterial leaf spot. The residual period was 10-14 days. Usage: to control leaf blight, use 25% wettable powder 100g 150g per 666.6 square meters and spray 40kg 50kg water. When the disease is serious, the dosage can be increased appropriately. The seedling field should be applied once in the fourth or fifth leaf period, and should be protected by drainage, seedling washing, seedling protection and spraying after typhoon and rainstorm. Control bacterial leaf streak, in case of typhoon weather, spray timely after wind and rain to protect young shoots and young trees. Spray with 25% wettable powder 500 times 750 times, or with 20% wettable powder 400 times 500 times diluent, spray enough depending on the size of the crown. Note: (1) the best way to apply pesticide is fog, not to be used as poisonous soil. (2) it should not be mixed with alkaline pesticides to avoid decomposition failure.

three。 Quinomycin (oxolinic acid)

Chemical name: 5-ethyl-5mine8-dihydro-8-oxo (1Magne3)-dioxin-(4pyr5g)-quinoline-7-carboxylic acid. Other name: Smur0208. Physicochemical properties: the drug is soluble in sodium hydroxide solution, but insoluble in acetone, chloroform, xylene, ethyl acetate and other organic solvents and water. Toxicity: low toxicity to higher animals. Dosage type: 1% ultrafine powder, 20% wettable powder. Control object: this agent is a new type of fungicide for the prevention and control of bacterial diseases. It has protective and therapeutic effects. It has high control effect on soft rot and blight. Usage: control rice seedling bacterial blight, use 20% wettable powder to control bacterial disease, leaf sheath brown stripe disease, soft rot, canker, spray at the initial stage of the disease, spray once every 5-7 days, spray 3 times 4 times. To control fire blight and soft rot of apple and pear, spray once every 7-10 days, for 2-3 times. Note: this agent has no effect on fungal diseases.

four。 Complex ammonia copper and zinc

Main ingredients: (1) copper tetraamine sulfate, (2) zinc tetraamine sulfate; or (1) copper tetraamine sulfate, (2) zinc tetraamine sulfate, (3) copper citrate. Other names: Hangkuning, Hangkuling. Toxicity: low toxicity to higher animals. Dosage type: 25.9%, 20% water agent. Control object: this agent is a mixed preparation, which has a good control effect on Fusarium wilt. Usage: control leaf blight and bacterial leaf spot, spray once every 5 to 6 days before and after typhoon and rainstorm in Honda or old disease area, spray twice with 25.9% water agent 600 times diluent at the initial stage of the disease, spray once every 10 days, a total of 2 times. To prevent and cure Fusarium wilt, at the initial stage of the disease, use 25.9% water 500,600 times diluent, 250ml per plant, or 1000 times spray. According to the interval of 7 to 10 days, spray 3 times 4 times; you can also use 20% water 400 times 600 times, 250 ml per plant. According to the development of the disease, it should be irrigated once every 7-10 days and 3-4 times in a row.

five。 Babbitt cream

1. Using imported crude drugs from the United States, American technology, and American formulations.

two。 Ternary compound, wide germicidal spectrum

3. The product is 100% water soluble, does not stimulate fruit noodles and does not pollute melons and vegetables.

4. It has four functions of protection, internal suction and conduction, treatment and fumigation.

5. It has broad-spectrum, strong and long-lasting germicidal efficacy.

6. Both through internal suction into the crop to kill germs

7. A protective film is formed on the crop surface to prevent the invasion of germs and kill them.

Usage: 1Plug 2000 spray irrigating disease once a week, three times in a row.

(Fei Xiang Lan Yuan)