Fresh Vegetables,Garlic,Ginger,Onion Fresh Fruits,Fresh Vegetables Co., Ltd. , http://www.nbvegetables.com
How to identify failed pesticides
Pesticides stored by farmers and pesticide management units, due to poor management, reduce the efficacy of pesticides, and some even fail. To this end, experts have introduced several methods for identifying whether various types of pesticides have failed: Identification methods for dairy pesticides: Observation method: Found that there are precipitation and layered flocculation phenomenon in pesticides. This medicine bottle can be placed in hot water. , Let stand for 1 hour, if the sediment is decomposed, the flocculent disappears, indicating that the pesticide is effective; otherwise, it cannot be used again. Swinging method: The stratification phenomenon occurs in the pesticide bottle. The lower layer of the upper oil slick is precipitated, and the medicine bottle can be shaken to make the pesticide uniform. Let stand for 1 hour. If it is still stratified, it proves that the deterioration of the pesticide has failed. If the stratification disappears, it means that it has not failed and can continue to be used. Powder pesticide identification method: Suspension method: Take powder pesticide 50 grams, placed in a glass bottle, add a little water into a paste, add appropriate amount of water and mix well, place 10-20 minutes, good pesticide powder fine, less And the precipitation is slow; failure of pesticide particles precipitate faster and more. Cauterization method: Take 10-20 grams of powder pesticide, put it on a metal plate and put it on fire. If it is white smoke, it means that the pesticide has not failed. Otherwise, it means that it has failed, and 5% of carbendazim powder is usually identified by this method. Observing method: If the powdered pesticide has agglomerated, it is not easily broken and proves to be invalid and can no longer be used. Wettable powder Pesticide identification method: Take one cup of fresh water, and sprinkle a little pesticide on the surface of the water. After 1 minute, if the pesticide can not be dissolved in water, it means that it has been degenerated. In addition, 1 gram of pesticide was sprinkled into a glass of water and stirred well. If sedimentation occurred quickly, the liquid surface appeared translucent, indicating that the pesticide had failed and could not be used.