Pesticides commonly come in different dosage forms such as emulsions, suspensions, and powders, and sometimes different dosage forms of the same drug can be found. So what are the advantages and disadvantages of different pesticide formulations, and what should be paid attention to when using them?
1、 Characteristics of pesticide formulations
Unprocessed pesticides become raw materials, which require processing and the addition of additives to be used. The dosage form of a pesticide depends first on its physicochemical properties, especially its solubility and physical state in water and organic solvents.
Although pesticides can be processed into various dosage forms, in practical applications, considering the necessity, safety, and economic feasibility of use, the number of dosage forms that can be processed for a pesticide is limited.
2、 Types of pesticide formulations
①. Powder (DP)
Powder is a powder preparation with a certain degree of fineness made by mixing, crushing, and remixing raw materials, fillers (or carriers), and a small amount of other additives.The effective ingredient content of powder is usually below 10%, and it generally does not need to be diluted and can be directly used for powder spraying. It can also be used for seed mixing, preparation of bait, toxic soil, etc. Advantages and disadvantages: Not environmentally friendly enough, gradually reducing usage.
②. Granules (GR)
Granules are loose granular formulations made by mixing and granulating raw materials, carriers, and a small amount of other additives.The effective ingredient content of the formulation is between 1% and 20%, and is generally used for direct spraying. Advantages and disadvantages: Convenient to spread, safe and long-lasting.
③．Wettable powder (WP)
Wettable powder is a powdered dosage form that contains raw materials, fillers or carriers, wetting agents, dispersants, and other auxiliary agents, and achieves a certain degree of fineness through mixing and crushing processes.The wettable powder can be mixed with water to form a stable and well dispersed suspension for spray. Standard: 98% pass through a 325 mesh sieve, with a wetting time of 2 minutes of light rain and a suspension rate of over 60%. Advantages and disadvantages: saves organic solvents, exhibits good performance, and facilitates packaging, storage, and transportation.
④．Water dispersible granules (WG)
Water dispersible granules are composed of raw materials, wetting agents, dispersants, isolating agents, stabilizers, adhesives, fillers or carriers.When used in water, it can quickly disintegrate and disperse, forming a highly suspended solid-liquid dispersion system. Advantages and disadvantages: Safe, high effective content, small volume, and high suspension rate.
⑤．Emulsion oil (EC)
Emulsion is a uniform and transparent oily liquid composed of technical drugs, organic solvents, emulsifiers and other additives. When used, it is diluted into water to form a stable emulsion for spray.The content of emulsifiable concentrate can range from 1% to 90%, usually between 20% to 50%. Advantages and disadvantages: The technology is relatively mature, and there is no sedimentation or stratification after adding water.
Post time: Aug-30-2023