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Misunderstanding 1: Powder pesticides are all used in water
Powder pesticides are made by mixing one or more pesticides with clay, clay and other fillers by mechanical processing. The pulverized powder passes through the No. 200 mesh, the coarse particles are coarse, the agglomeration is not easy, and the sprayability and dispersibility are good. However, the powder is not easily wetted by water, nor can it be dispersed and suspended in water, so it cannot be applied by water spray. Generally used for dusting, high-concentration powder can be mixed with seeds, soil treatment or preparation of baits.
Misunderstanding 2: Wet powder is used to spray powder
The wettable powder is prepared by adding one or more kinds of pesticide raw materials and filler clay, and adding a certain amount of washing powder and the like to the pulverizing and mixing. 99.5% of the pulverized powder passes through the 200 mesh sieve, the fineness is better than the powder, can be wetted by water, and can be uniformly suspended in water, and the suspension rate is generally above 60%, so that the liquid medicament can be fully adhered to plants and harmful organisms. On the surface of the body, the agent is allowed to exert a contact or stomach toxicity. Wettable powders are mainly used for water sprays. Because it contains a moisture-absorbing humectant, 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 for toxic soil application or seed dressing. Because of its poor dispersion performance, high concentration, it is easy to produce phytotoxicity.
Powder pesticides are easy to store and are not volatile. In farming, many farmers choose this type of dosage. However, many vegetable farmers have entered a misunderstanding when using powdered pesticides. The following are two major misunderstandings that vegetable farmers can easily enter:
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