Methods to identify pesticide failure

When farmers buy pesticides, they will inevitably be a little wary. They guess that the pesticide is pure and impure, and there is no problem with it. Only pure pesticides can get good insecticidal effects when spraying crops. So, what method can be used to guess whether it works well? Let me tell you the following. Pesticide manufacturers

The commonly used identification methods are:

1. Intuitive method

For powder pesticides, first look at the appearance. If it has been damp and agglomerated, the smell of the medicine is not strong or abnormal, and it can be rubbed into a ball with your hands, it means that it is basically invalid; for emulsion pesticides, first put the medicine bottle in a static state, if the liquid is turbid Unclear or stratification (ie separation of oil and water), formation of sediment or suspension of flocs, indicates that the agent may have failed.

2. Heating method

is suitable for pharmaceutical pesticides. Take 5--10 grams of the pesticide and heat it on a piece of metal. If a large amount of white smoke is produced and there is a strong pungent smell, it means that the medicine is good; otherwise, it has expired.

3. Floating method

is suitable for wettable powder pesticides. First take a cup of 200 grams of clear water, and then weigh 1 gram of pesticides. Sprinkle it gently and evenly on the water and observe carefully. The pesticides that are wet and sink in the water within 1 minute are invalid pesticides, otherwise they are invalid pesticides.

4. Suspension method

is suitable for wettable powder pesticides. Take 30-50 grams of pesticide, put it in a glass container, add a small amount of water to make a paste, then add 150-200 grams, stir evenly with clean water, and let it stand for 10 minutes to observe. Good performance, fine separation of the suspension in the liquid medicine, low sedimentation speed and low sedimentation volume, the opposite of invalid pesticides.

5. Oscillation method

is suitable for emulsion pesticides. For pesticides with oil-water layer, vigorously shake the agent first, and observe after standing for 1 hour. If there is still delamination, it means that the agent and the deterioration are invalid.

6. Hot melt method

is suitable for emulsion pesticides. Put the pesticide with the sediment into the warm water (the water temperature should not be too high, 50℃～60℃ is suitable) and observe after 1 hour. If the sediment is dissolved, it can be used again; if the sediment is difficult to dissolve or insoluble.

I hope you can learn from the above several methods. Maybe they will have a different effect on your crops. A good identification method will bring happiness to us.