What is the difference between pesticide dusts and wettable powders?
What are the characteristics of dusts and wettable powders? How do dusts differ from wettable powders? Can dust and wettable powder pesticides be mixed? The following brief introduction from Gengzhongbang Planting Network is for netizens' reference. Dusts and wettable powders are two common pesticide formulations, and the physical properties of these two formulations...
What are the characteristics of dusts and wettable powders? How do dusts differ from wettable powders? Can dust and wettable powder pesticides be mixed? The following brief introduction from Gengzhongbang Planting Network is for netizens' reference.Dusts and wettable powders are two common pesticide formulations. The physical properties of these two formulations differ, and their methods of use are different, so misuse must be prevented. Dust pesticides are made by mechanically grinding and mixing one or more pesticide technical materials with fillers such as potter's clay and clay. The powder particles are relatively coarse, not prone to caking, and have good flowability and dispersibility when dusted. However, dusts are not easily wetted by water, nor can they disperse and suspend in water, so they cannot be applied as a water-based spray. They are generally used for dusting, and high-concentration dusts can be used for seed dressing, as soil treatment agents, or for preparing poison baits, etc.
Wettable powders, on the other hand, are made by mechanically grinding and mixing one or more pesticide technical materials with fillers such as potter's clay, plus a certain amount of wetting agents such as washing powder. Their fineness is better than that of dusts; they can make hydrophobic powders wettable by water and can suspend evenly in water, with a suspension rate generally above 60%. This allows the liquid pesticide to fully adhere to the surfaces of plants and harmful organisms, enabling the pesticide to exert contact-killing or stomach-poison effects. Wettable powders are mainly used as water-based sprays. Because they contain wetting agents that readily absorb moisture, which can cause the powder to cake or clump, they cannot be used for dusting as dusts are. At the same time, they also cannot be used for broadcasting as poisonous soil or for seed dressing, because their dispersibility is poor and their concentration is high, making them prone to causing phytotoxicity.
The above is Gengzhongbang Planting Network's introduction to the characteristics of dusts and wettable powders. If you have better additions, please leave a comment below to let us know.