When purchasing or using pesticides, it is necessary to identify the quality of the pesticides. If the pesticides that have expired are purchased or used, it will not only directly cause economic losses, but also easily cause phytotoxicity, and at the same time, the pests and diseases will not be timely and effective. Prevention and control lead to reduced production.
Commonly used authentication methods are:
Intuitive method for powder pesticides, first look at the appearance, if it has been obviously wetted by agglomeration, the taste of the medicine is not strong or abnormal, and can be smashed into a group by hand, indicating and basic failure; for the emulsion pesticide, the medicine bottle is first allowed to stand, if the medicine The liquid is turbid or stratified (ie, oil-water separation), precipitate formation or floc suspension, indicating that the agent may have failed.
Heating method Suitable for pesticides. Take pesticide 5--10 grams 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 means it has failed.
Floating method Suitable for wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the water surface to observe carefully, wet in 1 minute and can sink to the water is a pesticide that is ineffective, otherwise it is a pesticide.
Suspension method Suitable for wettable powder pesticides. Take 30--50 grams of pesticide, put it in a glass container, first add a small amount of water to make a paste, then add 150----200g, stir well in water, let stand for 10 minutes to observe, and dissolve the pesticide that has not expired. Good in sex, the separation of the suspension in the liquid is small, the sedimentation speed and the amount of sedimentation are small, and the pesticide is reversed.
The oscillation method is suitable for emulsion pesticides. For pesticides with oily water layer, first shake the agent vigorously and let it stand for 1 hour. If stratification still occurs, the agent and deterioration will be invalid.
Hot melt method is suitable for emulsion pesticides. Put the pesticide with the precipitate into the warm water (the water temperature should not be too high, preferably 50 ° C ~ 60 ° C) after 1 hour, if the sediment is dissolved, it can continue to be used; if the sediment is difficult to dissolve or insoluble.
Huaxian Agricultural University Liu Huimin
Commonly used authentication methods are:
Intuitive method for powder pesticides, first look at the appearance, if it has been obviously wetted by agglomeration, the taste of the medicine is not strong or abnormal, and can be smashed into a group by hand, indicating and basic failure; for the emulsion pesticide, the medicine bottle is first allowed to stand, if the medicine The liquid is turbid or stratified (ie, oil-water separation), precipitate formation or floc suspension, indicating that the agent may have failed.
Heating method Suitable for pesticides. Take pesticide 5--10 grams 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 means it has failed.
Floating method Suitable for wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the water surface to observe carefully, wet in 1 minute and can sink to the water is a pesticide that is ineffective, otherwise it is a pesticide.
Suspension method Suitable for wettable powder pesticides. Take 30--50 grams of pesticide, put it in a glass container, first add a small amount of water to make a paste, then add 150----200g, stir well in water, let stand for 10 minutes to observe, and dissolve the pesticide that has not expired. Good in sex, the separation of the suspension in the liquid is small, the sedimentation speed and the amount of sedimentation are small, and the pesticide is reversed.
The oscillation method is suitable for emulsion pesticides. For pesticides with oily water layer, first shake the agent vigorously and let it stand for 1 hour. If stratification still occurs, the agent and deterioration will be invalid.
Hot melt method is suitable for emulsion pesticides. Put the pesticide with the precipitate into the warm water (the water temperature should not be too high, preferably 50 ° C ~ 60 ° C) after 1 hour, if the sediment is dissolved, it can continue to be used; if the sediment is difficult to dissolve or insoluble.
Huaxian Agricultural University Liu Huimin
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