At present, among commonly used pesticide formulations, emulsifiable concentrates, wettable powders, colloidal suspensions, and aqueous formulations are more common. These formulations can play a better role in specific environments and conditions. However, with the increasing attention to environmental protection, people have higher requirements for the use of pesticides, so these formulations have their corresponding limitations.
To this end, pesticide experts are constantly pursuing and exploring new pesticide formulations that are more efficient, safer and more environmentally friendly. Among them, dry suspension agent (DF) is one of the successfully developed formulations. At present, in some western developed countries, the dry suspension agent has been developed more maturely. In general, the dry suspension agent has the following characteristics:
It can disintegrate rapidly in water with good dispersibility and suspension. For example, Pinrun 7ODF, Cuibei 5ODF and Chengbiao 8ODF produced by Bass, Germany, disintegrate immediately in water, disperse in 6 seconds, and form a stable suspension with a little stirring without sedimentation. No caking and blocking of the nozzle.
The liquid medicine particles * are fine and can be uniformly attached to the crop surface to form a dense protective film. If it is supplemented with a good adhesive developer, it can enhance the adhesion performance and resist rain wash. Generally, the duration of bactericides is 5-7 days, but for example, when Nongliling 5ODF is used to treat gray mold, the duration of such dry suspension agent can be as long as 10-14 days. As a preventive agent for downy mildew and anthrax, Pinrun 7ODF also has a duration of more than 10 days.
The size proportion of the liquid medicine particles is reasonable, which can not only ensure the quick effect and persistence of the medicine, but also ensure the full and complete contact between the medicine and the crop surface, so as to improve the efficacy.
Good safety, unlike some wettable powders, particles will form local high concentrations on the crop surface. Dry suspension agents such as Nongling 5ODF are not easy to cause harm, and can be used even in the flowering period. Grey mold is often infected in the flowering period, so Nongling 50DF shows its advantages in grey mold; Another example is the marked 8ODF, whose effective ingredient is sulfur. But because of its advantages in safety and efficacy, it can be applied to more crops than sulfur suspension agent and sulfur powder. When it is used to control powdery mildew and various harmful mites, it has a small dosage but good effect.
Environmentally friendly formulation can reduce the pollution of organic solvent; No dust, no adhesion, more fully used, safer for operators and the surrounding environment.