CATDOLL : CATDOLL: What should we pay attention to when using "dichlorvos"?

1. What should we pay attention to when using "Dichlorvos"?

The operation method and characteristics of trichlorfon: the pure trichlorfon is white crystals with odor and relatively soluble electrolytes; the industrial product is white small solid blocks containing about 90% of the relevant ingredients, which are called trichlorfon crystals; there are also crude products containing only 2.5% of the relevant ingredients, which are called trichlorfon granules.

How to use trichlorfon Matters that require special attention when using trichlorfon

Efficacy: Trichlorfon is an alkaline phosphatase retarder, which enters the circulation and various organs of the human body mainly through the inhalation, skin contact and ingestion of sparganosis, so that the nervous system can be shut down and insects, crustaceans, etc. Trichlorfon is an effective drug for fish and crustacean diseases.

Operation method: When spraying the whole pond, use 1-49 of trichlorfon granules or 0.2-0.59 of trichlorfon crystals per cubic meter of water to eliminate ringworms, fish mullets, water centipedes, sword water fleas, clams and shrimps, etc. Use 0.2-0.39 of trichlorfon crystals per cubic meter of water, once every 3-5 days, and use it three times to prevent anchor fish disease; use 0.

It can cure ringworm disease and trichomonad disease. If 0.39 is used again the next day, it can cure carp uterine nematode disease; using 0.59 of trichlorfon crystals and 0.29 of aluminum sulfate per cubic meter of water can prevent Chinese sparganosis. Bathing method: The content of trichlorfon crystals is 20-409 per cubic meter of water. Bathing fish at a temperature of 10-150C for 10-20 minutes can eliminate trichomonads, ringworms, Chinese sparganosis, anchorhead sparganosis and other sparganosis (please use this method with caution).

Frequently asked questions: Because trichlorfon and pyraclostrobin are acidic and alkaline, they can corrode metal materials, so metal materials cannot be used to hold the medicine. Trichlorfon turns into a double-blind when it meets alkali, which increases the susceptibility to disease. When preparing the medicine, it is generally not necessary to use it with alkaline medicines unless the prescription requires it to be used with alkali, so as to prevent fertilizer damage. Precious fish species such as bream, freshwater silver pomfret, and California bass are particularly sensitive to trichlorfon and are generally not suitable for use. The efficacy of trichlorfon is related to pH. The higher the pH, the faster the efficacy of trichlorfon will fade. If used together with atropine and phosphatoxin, it will be ineffective due to antagonism.

Be sure to pay attention to the method and approach. Wear protective gloves and protective clothing when spraying pesticides. Do not expose your skin or touch your eyes with your hands. The best time is after 5 pm.

The first thing is to pay attention to the concentration and the dosage. Don't use too much at one time. You also need to dilute it with water in advance. Also, pay attention to the concentration used. Don't use it blindly or mix all pesticides together.

What you should pay attention to when using this pesticide is that you must wear gloves, then dilute it with water and do not spray it on flowers.

2. There is no medicine for fish farming and water swelling

There is no medicine for fish farming: fish disease prevention and control is a key measure to increase fish production. Preparing some commonly used fish farming medicines is the prerequisite for preventing and controlling fish diseases.

Drugs that should be kept on hand. ① Quicklime. Quicklime can be used to clean ponds in spring and winter and prevent fish diseases during the fish farming season. It has a certain killing power on pathogens in ponds; it can also improve water quality and increase

Adding fertilizer to the pond water and maintaining the pH balance of the water is beneficial to the growth of fish. Quicklime should be kept in a sealed container. After absorbing water in the air, its effect will be reduced. ② Bleaching powder. Bleaching powder is one of the commonly used drugs in fish disease prevention and treatment. Its main function is to treat bacterial fish diseases. It can kill bacteria outside the fish body and in the water. It can also be used to clean the pond.

Bleach is corrosive to metals. It is best to keep it in a sealed pottery container to prevent moisture and exposure. ③ Salt. Used to kill parasites and bacteria on the surface of fish. Before stocking fish, it is often used for disinfection. ④ Trichlorfon. It can prevent and treat fish diseases caused by crustaceans, and can also kill parasites on the surface and in the intestines of fish. It can also be used to kill swordfish in the fry pond during the fry cultivation stage.

Water fleas, water centipedes, etc. ⑤ Garlic. Garlic has a good bactericidal effect. According to a certain ratio, it can be mixed with feed and fed to fish to prevent enteritis. ⑥ Sulfonamides. Sulfonamides include sulfadiazine, sulfathiazole and sulfaguanidine. Mixing them with feed can prevent intestinal bacterial infection and can also be used as an oral medicine to prevent red skin disease.

3. Does anyone know what wavelength is used to measure trichlorfon using ultraviolet light? Where can I find information? Thank you.

Baidu input keywords. Ultraviolet test for trichlorfon. Tested at 366nm wavelength. Physical and chemical properties

Physical and chemical properties of trichlorfon (52-68-6):

1. The pure product is colorless crystals with a melting point of 83-84°C, a vapor pressure of 0.21 mPa/20°C, a density d204 of 1.73, and a refractive index n20D of 1.3439 (10% aqueous solution).

2. The solubility in water at room temperature is 15%. It is easily soluble in organic solvents such as benzene, ethanol, methanol, etc., but insoluble in petroleum.

3. Low volatility, 0.11mg/m3 at 200℃.

4. In solid state, its chemical properties are very stable. It gradually decomposes and becomes ineffective after being mixed into aqueous solution. It is relatively stable in acidic solution and turns into more toxic and volatile DDT in alkaline solution.

toxicity:

The acute oral LD50 of female and male rats is about 250mg/kg, and the acute dermal LD50 of female and male rats is >5g/kg (24 hours); it has no irritation to rabbit skin and eyes. The acute inhalation LC50 of female and male rats (4 hours) is >0.5mg/L air (aerosol). The no-effect dose in the two-year feeding test is: 100mg/kg feed for rats and 300mg/kg feed for mice. The no-effect dose in the four-year feeding test for dogs is 50mg/kg feed. The ADI for humans is 0.01mg/kg body weight. The fish toxicity LC50 (96 hours): 0.7mg/L for rainbow trout and 0.52mg/L for golden round belly croaker. Low toxicity to bees and other beneficial insects. The LC50 for Daphnia (48 hours) is 0.00096mg/L.

use

Trichlorfon (52-68-6) is very effective against Diptera, Lepidoptera, and Coleoptera pests, but has poor control effects on mites and some aphids. It is suitable for controlling various crop pests such as grain, cotton, fruit trees, vegetables, oilseeds, tobacco, tea, as well as sanitary pests and external parasites of livestock. It is an organophosphorus insecticide with low toxicity and a broad insecticide spectrum. It can be converted into dichlorvos in weak alkali, but it is unstable and quickly decomposes and loses its effectiveness. It has a strong stomach poison effect on pests and has a contact killing effect. It has permeability to plants, but has no systemic conduction effect.

How to use trichlorfon (52-68-6):

1. Control of rice pests: Control of rice stem borer. Use the drug in the tillering stage to control the tip blight, and use the drug in the booting stage to prevent plant injury. Use 80% crystal or soluble powder 2250-3000g/hm2 (effective ingredient 1.8-2.4kg/hm2), spray with 1000-1500kg water. This drug can also control rice leaf flies, rice iron beetles, rice budworms, rice leaf rollers, rice leafhoppers, rice thrips and other pests.

2. Control of pests of dryland crops: (1) Armyworm: For wheat armyworm, use 80% crystal or soluble powder 2250g/hm2 (active ingredient 1.8kg/hm2), spray with 250-1000kg of water, or 5% trichlorfon powder 1.8kg/hm2 (active ingredient 1.5kg/hm2) for dusting. (2) For soybean bridgeworm, use 80% crystal or wettable powder 2250g/hm2 (active ingredient 1.8kg/hm2), spray with 750-1000kg of water. The same dosage can also control bean sedge and grass borer. (3) Beet weevil: Use the same dosage as soybean bridgeworm.

3. Prevention and control of cotton pests: To prevent and control cotton bollworm, cotton borer and cotton leafhopper, use 80% crystal or soluble powder 2250-4500g/hm2 (active ingredient 1.8-2.4kg/hm2), spray on 1000kg water.

4. Prevention and control of vegetable pests: To prevent and control Pieris rapae, Plutella xylostella and Cabbage armyworm, use 80% crystalline fast-soluble powder 1.2-1.5kg/hm2 (effective ingredient 960-1200g/hm2), spray on 750kg water.

5. Prevention and control of tea pests. To prevent and control tea caterpillars (tea yellow tussock moth, cabbage moth, oil tea tussock moth) and tea geometrids, spray evenly with 1000 times dilution of 80% soluble powder (effective concentration 800 mg/L).

6. Control of fruit tree pests: (1) Litchi stink bug: Apply once each time from late March to late May, before the adults mate and lay eggs, and during the peak period of nymphs, using 800-1000 times dilution (effective concentration 1125-900 mg/L) of trichlorfon crystals (containing more than 90% of the active ingredient) and spray evenly on the ground. If spraying with a domestic Yun-5 aircraft, use 80% soluble powder 375-450g/hm2 (active ingredient 300-360g/hm2), 30-40L of water, 160-170km/h, effective spray width 50m, operating height 5-10m from the tree canopy, and shuttle spraying. (2) Lychee borer: Apply pesticide once each time 25 and 15 days before lychee harvest. Dilute 50 times of dichlorvos crystal or soluble powder (effective concentration 1600 mg/L) and add 500 times of 25% insecticide aqueous solution (effective concentration 500 mg/L), and spray evenly. If spraying is done by airplane, use dichlorvos soluble powder plus insecticide aqueous solution 600-900 ml/hm2 for spraying.

7. Forestry pest control: To control pine caterpillars, use 25% emulsion 2250-3000g/hm2 (active ingredient 550-750g/hm2) and spray with an ultra-low volume sprayer.

8. Underground pest control: For the control of cutworms and mole crickets, use 750-1500g/hm2 of active ingredients. Dissolve trichlorfon with a small amount of water, then mix with 60-75kg of fried cottonseed cake or rapeseed cake. It can also be mixed with 300-450kg of chopped fresh grass to make poison bait, and spread it on the soil surface at the root of crops in the evening to lure and kill pests.

9. Prevention and control of livestock and sanitary pests To prevent and control parasitic pests on the skin of horses, cattle and sheep, such as cattle lice, sheep lice, pig lice, cattle tumor fly maggots, etc., you can use 80% soluble powder 400 times (effective concentration 2000mg/L) liquid to wash. To prevent and control stable flies and house flies in horse and cattle stables, you can use 80% soluble powder 1:100 to make poison bait to kill them.