Pyrasulfotole

Pyrasulfotole belongs to the pyrazole-ketone chemical class and is a highly effective systemic herbicide for post-emergence application.

The active ingredient penetrates the plant through the leaves and moves through the xylem and phloem, reaching the active growth zones of the weeds.

The mechanism of action is based on the inhibition of the enzyme 4-hydroxyphenylpyruvate dioxygenase (4-HPPD), which is critical for carotenoid biosynthesis.

As a result of blocking carotenoid synthesis in treated tissues, chlorophyll degradation occurs, causing characteristic bleaching (discoloration) of the weed meristematic tissues.

Without chlorophyll, the plant loses its ability to photosynthesize and dies rapidly under sunlight, with symptoms appearing within 3–5 days.

Pyrasulfotole is mainly used to control a wide range of annual broadleaf weeds in cereal crops.

The product effectively eliminates problematic species such as common lambsquarters, various pigweed species, hemp-nettle, common chickweed, and shepherd's purse.

The substance shows high activity even against overgrown weed individuals, making it a flexible tool in the protection system.

A special value is the ability of the product to suppress weeds that are resistant to herbicides from the sulfonylurea and triazine groups.

In field conditions, pyrasulfotole is often used in tank mixtures with other herbicides to broaden the spectrum of action against grass weeds.

The application rate of pyrasulfotole depends on the weed species composition, crop development stage, and weather conditions during the growing season.

The optimal application window is the active growth stage of weeds, ranging from cotyledons to the 4–6 true leaf stage.

To achieve maximum biological efficacy, it is recommended to add surfactants (adjuvants) that improve wetting and penetration.

The product is applied by ground spraying at air temperatures from +10°C to +25°C, provided there is no heavy rainfall for 2–4 hours after the procedure.

It is important to avoid treatments during periods when cereal crops are stressed by drought, frost, or pest damage.

Pyrasulfotole requires strict adherence to usage regulations to prevent potential phytotoxicity to crop plants.

It is not recommended to spray during high humidity and when there is a risk of night frosts, as these factors decrease metabolism and the product's effectiveness.

For personnel working with the product, personal protective equipment for the respiratory tract, skin, and eyes is mandatory.

It is necessary to prevent drift of the working solution onto neighboring fields of sensitive crops, as high concentrations of pyrasulfotole may cause stunting.

Storage must be carried out in original packaging in cool warehouses inaccessible to children and pets.