What are the characteristics of pesticide deterioration? How should I save it?

Pesticides are commonly used to prevent and control the invasion of diseases and insect pests in our pesticide production process, and the national requirements for the use of pesticides are very strict. In the actual production process, some farmers have bought back pesticides for a long time, but they have actually deteriorated or lost their efficacy. What are the characteristics of pesticide deterioration? How should I save it?

What are the characteristics of pesticide deterioration?

1. Thermal dissolution method: put the precipitated emulsion pesticide into 50 ℃ warm water together with a bottle. After 1 hour, if the precipitate dissolves slowly, it shows that the drug has not yet failed. If the precipitate is difficult to dissolve or insoluble, the drug has deteriorated and failed.

2. Oscillation method: when the oil-water separation occurs in the emulsion pesticide, you can shake the bottle and shake the bottle. If the separation layer still appears after 1 hour, it means that the drug has failed.

3. Floating method: take 1 gram of wettable powder pesticide and sprinkle it evenly on 200 ml clear water. If it is moist and sunk into the water within 1 minute, it is not invalid pesticide, otherwise it is invalid pesticide.

4. Dilution method: take 100 grams of emulsion pesticide, put it in a glass bottle and add 300 grams of water. Oscillate forcefully, after standing for half an hour, if the concentration of the solution is uneven, there is EC on it and there is sediment at the bottom, which means that the drug has failed. The more EC, the worse the medicine.

5. Suspension method: take 50 grams of wettable powder pesticide, put it in a glass container, mix well with water, and stand for 10 minutes. If the solubility of the pesticide is poor and the suspended powder is thick, it will be an invalid pesticide.

Second, how should pesticides be preserved?

1. Prevent the sun. Pesticides in brown bottles generally need to be kept out of light. Pesticides that need to be protected from light, if exposed to light for a long time, will cause pesticide decomposition deterioration and failure. For example, after the emulsion pesticide is exposed to the sun, the emulsifying performance becomes worse and the efficacy decreases. Therefore, it is necessary to avoid sunlight during storage; if the microbial active preparation is exposed to strong light, the active bacteria will lose their activity.

2. In the place where pesticides are stored, the temperature should not exceed 25 ℃, and more attention should be paid to keeping away from the source of fire in order to prevent efficient decomposition of pesticides. Low temperature should pay attention to anti-freezing, the temperature should be kept above 1 ℃; the common method of anti-freezing is to cover with crushed firewood and grass, bran shell or unused quilt.

3. Highly volatile pesticides should be sealed to avoid volatilization, reduce efficacy, pollute the environment and endanger human health. A small amount of pesticides that have failed or remain should not be dumped everywhere in the field, let alone into ponds, streams, rivers or wells; nor can they be used after increasing the concentration at will, and deep burial treatment should be taken to avoid environmental pollution.

4. Pesticides should be centrally stored in one place and marked. If the bottled pesticide breaks, change the package and label it to prevent misuse.

5. Pesticides should not be stored in the same room with grain, oil, beans, seeds, vegetables, food and animal feed, and special care should be taken not to put them in places accessible to children.

6. Powders and pesticides should be placed in a dry place to prevent them from becoming ineffective due to moisture caking.

7. Classified storage. According to acidity and alkalinity, pesticides can be divided into three categories: acidic, alkaline and neutral. These three kinds of pesticides should be stored separately, not too close to prevent pesticide deterioration, and can not be stored together with alkaline substances, ammonium bicarbonate, ammonium nitrate and so on.

8. Do not store pesticides and flammable and explosive materials together, such as fumigant, gasoline, etc., to prevent fire.