Resins and polymers

Resins and polymers in agrochemistry are classified as auxiliary substances — adjuvants that physically modify the properties of pesticide working solutions. Unlike active ingredients aimed at destroying pests or weeds, this group ensures the delivery and retention of the product on the plant surface.

The mechanism of action is based on the creation of a thin elastic film after water evaporates from the working solution droplet. Polymer compounds change the surface tension of the droplet, which promotes better distribution of the product over the waxy coating of leaves or insect cuticles.

These substances reduce the probability of active ingredient crystallization on the plant surface, ensuring their more uniform and prolonged penetration into tissues. This is especially critical for systemic products that require stable contact with the epidermis.

Due to their structure, resins and polymers significantly increase the resistance of pesticides to being washed off by rain or heavy dew. They anchor the active ingredient, creating a kind of «depot» for the product, from which it is gradually released over several days.

The use of polymer additives allows for a reduction in the evaporation of volatile components of the working solution, especially in conditions of low humidity and high air temperature. This minimizes product losses during spraying and prevents the premature drying of the droplet.

The group of resins and polymers is used in almost all types of plant protection: from fungicidal treatments against powdery mildew and late blight to the application of insecticides and herbicides.

The use of these substances is effective against a wide range of pathogens sensitive to contact pesticides, as it allows for holding a high concentration of the chemical agent on the leaf blade.

In the protection of fruit crops, polymers help prevent the working solution from running off smooth leaves and fruits, which significantly increases the biological efficiency of protective measures.

Application in herbicide programs allows for more reliable control of hard-to-kill weeds, which have a powerful waxy layer that usually repels water-based solutions.

Resins are also used for seed treatment, where they act as components of seed coatings (pelleting), ensuring strong retention of the seed dressing on the seed and preventing dust shedding.

Consumption rates of resins and polymers depend on the type of product they are used with and the climatic conditions of the region. On average, the dosage is from 0.1 to 0.5 liters per 100 liters of the working solution.

Application timing is strictly tied to the application of primary plant protection products. The adjuvant is added to the tank mix last, after the complete dissolution of all pesticides, while constantly stirring.

It is extremely important to follow the order of adding the products to avoid coagulation or the formation of flakes, which can lead to clogging of the sprayer nozzles.

It is recommended to carry out the treatment in the morning or evening hours, when the air temperature is between 15-25 degrees Celsius, which ensures optimal formation of the polymer film.

When planning agrotechnical work, it is necessary to consider the compatibility of the polymer with water hardness: an excessive salt content can negatively affect the stability of the solution.

A limitation is the high viscosity of some polymer compositions, which requires thorough flushing of the sprayer immediately after completing the work to prevent clogging of filters and nozzles.

It is not recommended to exceed the maximum permitted dosages, as an excessive amount of polymer can create a film that is too dense, obstructing plant respiration (gas exchange).

Application on crops that are in a state of severe stress (drought, frost) should be avoided to prevent worsening the condition of the plants due to prolonged retention of chemical substances.

Compatibility with each specific pesticide must be checked, as some micro-fertilizers and fungicides may enter into a chemical reaction with the polymer base.

• Check the PH of the working solution before mixing.
• Use only certified adjuvants.
• Follow the regulations regarding the pre-harvest interval.