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Interaction between a biostimulant and cyazofamid in the control of clubroot of crucifers under conditions of high disease density

ABSTRACT Clubroot of crucifers is a root disease caused by the fungus Plasmodiophora brassicae, responsible for causing more than 40% economic damage to brassica crops. This disease has led to a gradual decline in brassica production in several countries, including Brazil, where an approximate volume of 50 thousand tons are marketed every year. There are few studies involving the control of this disease, which led to the development of an experiment with four treatments: T1. negative control, T2. biostimulant (phosphorus + auxin + fulvic acid), T3. biostimulant + fungicide (phosphorus + auxin + fulvic acid + cyazofamid) and T4. fungicide (cyazofamid). The lowest incidence value obtained in the last evaluation was 21% (79% control) with the mixture of biostimulant and fungicide; the biostimulant alone did not significantly differ from the negative control, considering the condition of high inoculum density, which serves as a basis for future studies with a mixture of new compounds and biocontrol agents compatible with the fungicide.