What should I pay attention to when using trichlorfon?

Trichlorfon is a highly effective, low-toxicity and low-residue insecticide. It has a good killing effect on flukes, nematodes, echinocephalus and cladoperas, coperans, mussel hook larvae and water centipedes that harm fish fry and fish eggs. However, due to the fact that trichlorfon can form dichlorvos with greater residual toxicity under weak alkaline conditions, when the pH value is 8-10, it only takes half an hour for trichlorfon to transform into dichlorvos.

Therefore, it is necessary to take into account not only the toxic effects of fish, but also the safety of humans and animals. Therefore, the following ten points should be paid attention to when using trichlorfon to control fish diseases.

One. Be right for the situation. Trichlorfon commonly used in fish disease control is mainly 90% crystal trichlorfon. It can only prevent and treat parasitic fish diseases, and is ineffective against bacterial and viral fish diseases, so you should first determine what the disease is, and then prescribe the right medicine, not blind medicine.

Two. It is necessary to grasp the characteristics of pesticides and dissolve them. Trichlorfon is easily soluble in water, avoid dissolving with hot water of more than 50, should be dissolved in pond water, trichlorfon aqueous solution is unstable, so it should not be put for a long time after preparing the medicinal solution, and should be splashed and medicated bath immediately.

Three. It is necessary to grasp the timing of medication. Because the pH value of the water in the morning is lower than that in the daytime, and the larvae of the anchor head eel are often concentrated on the surface of the water in the morning, the medication should be carried out in the morning, and the fish floating head or floating head should not be used at the end of the time.

Four. It is necessary to strictly control the dosage of medication. Do not use excessive amounts at will, such as milligram kilogram concentration milligram kilogram concentration anti-ring worm, pine algae insect, Chinese sao sao, anchor head eel, etc., milligram kilogram concentration - 2 milligrams kilogram concentration is used for stagnant water to clear ponds, kill eels, mandarin fish and aquatic insects.

After <> diluted with water, trichlorfon insecticides should be prepared and used immediately, and should not be left for a long time.

Vegetables can be sprayed with 1000 times of trichlorfon insecticide, and drugs are prohibited 7 days before harvest.

For apples, corn, sorghum, beans and other crops, it is necessary to use trichlorfon insecticides with caution, otherwise it is easy to cause pesticide damage.

If trichlorfon insecticide is to be used on livestock, the weight should be determined before use, and then the dosage should be calculated according to the weight, too much dosage will lead to poisoning or death of livestock.

1. Contraindications for the use of trichlorfon insecticides

1. After dilution of trichlorfon insecticide, it should not be placed for a long time, and it should be prepared and used immediately.

2. When used on crops, 1000 times of trichlorfon insecticide can be sprayed (about 1000 times). 7 days before the vegetable harvest, the use of the drug is prohibited.

3. Apples and corn are more sensitive to trichlorfon insecticides, and sorghum and beans are very sensitive to trichlorfon insecticides, which are easy to produce pesticide damage after use.

4. The first dose of trichlorfon insecticide is relatively close to the poisoning dose, when used in livestock, too much dosage will cause poisoning and even death, in order to ensure the safety of livestock, the weight should be determined before medication, and then the dosage should be calculated according to the weight.

5. Trichlorfon insecticides can not be used on chickens, ducks, geese and other poultry, because the drug belongs to organophosphorus preparations, and common poultry are more sensitive to organophosphorus preparations, and it is easy to cause harm after use (organophosphorus preparations can infringe on the brain of birds, and will cause neurological disorders after entering the poultry body, and at the same time, the hydrolysis effect of organophosphorus preparations on poultry is weak, that is, the natural detoxification ability of organophosphorus is relatively low).

6. Trichlorfon insecticide can not be used in combination with alkaline drugs, or at the same time, if it comes into contact with alkaline drugs or alkaline substances, the toxicity will be enhanced, resulting in poisoning or death of livestock.

7. Lime water, soft soapy water, hard soapy water, artificial salt, stomach powder, sodium bicarbonate, and sodium salts in various sulfonamides are all alkaline drugs, which should be avoided in combination with trichlorfon insecticides, or used at the same time, and ordinary alkaline hard water cannot be used to prepare trichlorfon solution.

Second, the use of trichlorfon insecticides

1. Allium maggots, radish maggots, and cabbage maggots: During control, use 1000-1500 times of trichlorfon insecticide to irrigate the roots.

2. Pests such as vegetable tobacco worms, yellow gourds, and yellow striped beetles: during control, 80-100 grams of 80% trichlorfon soluble powder mixed with 75-100 kg of water per mu, and then sprayed. The safe interval for the use of trichlorfon in vegetables should not be less than 7 days.

3. Young larvae such as whiteflies, poisonous moths, stinging moths, butterflies, and longhorn beetles: during control, dilute 90% trichlorfon crystals with water into 1000 times of liquid, and then spray.

4. Pests such as rice planthopper, rice borer, rice leaf roller: during control, 150-200 grams of 80% trichlorfon soluble powder mixed with 75-100 kg of water per mu, and then spray the rice. The safe interval for the use of trichlorfon in rice should be greater than 7 days.