Spring field inspections often reveal the presence of dry rot of crucifers, but this is just the beginning of the threats. Diseases such as black rot of crucifers or sclerotinia rot are just starting their development cycle now, although their symptoms (e.g. sclerotia in stems) will only be seen in summer. Verticillium wilt is a particular challenge – difficult to diagnose, developing covertly since autumn. If it occurred in the field in previous years, its recurrence is almost certain, which necessitates the prophylactic use of fungicides. In the fight against pathogens, triazoles (e.g. difenoconazole, tebuconazole, metconazole) are fundamental. However, it should be remembered that for effective action, they require an average daily temperature above 10°C. In parallel with fungicide protection, it is necessary to take care of canopy regulation, which brings a number of physiological benefits. This treatment stimulates the development of a strong root system, which becomes an ...