Kolosal

Systemic mechanism of action: Tebuconazole in practice

The fungicide "Kolosal" by the company "Avgust" is based on the active ingredient tebuconazole (triazole class). The technical essence of the product lies in inhibiting the biosynthesis of ergosterol in pathogen cell membranes. Unlike contact pesticides, tebuconazole exhibits strong systemic properties: it penetrates plant tissues rapidly and undergoes acropetal redistribution, protecting both treated foliage and new plant growth.

Agrotechnical application features

• Formulation: As an emulsifiable concentrate, the product effectively adheres to leaf surfaces and quickly penetrates the cuticle.
• Control Spectrum: The product demonstrates high technical efficacy against a wide range of rust fungi, including brown and yellow rust, as well as complex leaf spots such as net blotch, dark brown spot, and alternaria.
• Dosage Flexibility: Depending on the phytosanitary status and crop development stage, the application rate varies from 0.5 to 1.0 L/ha.

A critical aspect of the application protocol is the limit of a maximum of two treatments per season, with a mandatory 30-day pre-harvest interval (PHI). This allows for effective management of the infection pressure during the critical developmental stages of cereals, soybeans, rapeseed, and rice, while minimizing residue concentrations by harvest time.

Practical takeaways for the agronomist

"Kolosal" serves as a "heavy artillery" tool for treating established symptoms and providing preventive protection under high epiphytotic risk conditions. When using the product, it is essential to consider the hazard class (3) and adhere strictly to dosage guidelines. As a triazole-class systemic fungicide, it provides a strong "stop-effect" but requires precise timing relative to weather conditions and the growth rate of the plant's canopy.