Two misunderstandings in the use of Powder Pesticide

Powder pesticides are easy to store and not easy to volatilize. In agricultural production, many vegetable farmers will choose this dosage form. However, many vegetable farmers have entered two misunderstandings when using powder pesticides.

Misunderstanding 1: powder pesticides are all used in water. Powder pesticides are made from one or more raw pesticides, clay and other fillers, which are crushed by mechanical processing. After 200 sieve mesh, the crushed powder is coarse, not easy to agglomerate, and has good spraying fluidity and dispersibility. However, the powder is not easy to be wetted by water, nor can it be dispersed and suspended in water, so it can not be applied by water spray. Generally used for powder spraying, high concentration powder can be used for seed dressing, soil treatment or preparation of poison bait, etc.

Misunderstanding 2: wettable powder is used to spray powder. Wettable powder is made of one or more pesticides and fillers, such as clay, and mixed by mechanical processing with a certain amount of washing powder and other wetting agents. 99.5% of its crushed powder passes through a 200-mesh sieve, and its fineness is better than that of powder. it can be wetted by water and can be uniformly suspended in water. its suspension rate is generally more than 60%, which can make the liquid agent fully adhere to the surface of plants and harmful organisms. make the agent play the role of contact or stomach poison. Wettable powder is mainly used for water spray. Because it contains a wetting agent that is easy to absorb moisture, it can make the powder agglomerate or agglomerate, so it can not be used as a powder, at the same time, it can not be used as poisonous soil or mixed with seeds. Because of its poor dispersion and high concentration, it is easy to cause drug damage.