Two common misconceptions about using powder-form pesticides, have you avoided them?
Two misconceptions about using powder-form pesticides
(Agricultural Wealth Network) Powder-form pesticides are convenient to store and not prone to volatilisation, so many vegetable growers choose this formulation in farming production. However, many vegetable growers fall into two misconceptions when using powder-form pesticides.
Misconception one: Using all powder-form pesticides diluted in water. Powder-form pesticides are made by mechanically crushing and mixing one or more technical-grade pesticide materials with fillers such as potter's clay and clay. The crushed powder passes through a No. 200 sieve; the particles are relatively coarse, not prone to caking, and have good spraying flowability and dispersibility. However, powders 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; high-concentration powders can be used for seed dressing, soil treatment, or preparing poison bait, etc.
Misconception two: Using wettable powders for dusting. Wettable powders are made by mechanically crushing and mixing one or more technical-grade pesticide materials with fillers such as potter's clay, plus a certain amount of wetting agents such as washing powder. 99.5% of the crushed powder passes through a 200-mesh sieve; the fineness is better than that of powders, it can be wetted by water, and it can be uniformly suspended in water, with a suspension rate generally above 60%, which allows the liquid pesticide to fully adhere to the surfaces of plants and harmful organisms, enabling the pesticide to exert contact-killing or stomach-poisoning effects. Wettable powders are mainly used as a water-based spray. Because they contain moisture-absorbing wetting agents that can cause the powder to cake or clump, they cannot be used as powders; at the same time, they also cannot be applied as poisonous soil broadcasting or used for seed dressing. This is because their dispersibility is poor and their concentration is high, making them prone to causing phytotoxicity.
Misconception one: Using all powder-form pesticides diluted in water. Powder-form pesticides are made by mechanically crushing and mixing one or more technical-grade pesticide materials with fillers such as potter's clay and clay. The crushed powder passes through a No. 200 sieve; the particles are relatively coarse, not prone to caking, and have good spraying flowability and dispersibility. However, powders 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; high-concentration powders can be used for seed dressing, soil treatment, or preparing poison bait, etc.
Misconception two: Using wettable powders for dusting. Wettable powders are made by mechanically crushing and mixing one or more technical-grade pesticide materials with fillers such as potter's clay, plus a certain amount of wetting agents such as washing powder. 99.5% of the crushed powder passes through a 200-mesh sieve; the fineness is better than that of powders, it can be wetted by water, and it can be uniformly suspended in water, with a suspension rate generally above 60%, which allows the liquid pesticide to fully adhere to the surfaces of plants and harmful organisms, enabling the pesticide to exert contact-killing or stomach-poisoning effects. Wettable powders are mainly used as a water-based spray. Because they contain moisture-absorbing wetting agents that can cause the powder to cake or clump, they cannot be used as powders; at the same time, they also cannot be applied as poisonous soil broadcasting or used for seed dressing. This is because their dispersibility is poor and their concentration is high, making them prone to causing phytotoxicity.