Postinoculation Application of Fungicides to Manage Alternaria raphani on radish

Radish (Raphanus sativus L.) can be infected by Alternaria raphani with the possible outcome of significant loss. A study was undertaken to determine the efficacy of postinfection application of fungicides on control of the pathogen. The systemic fungicides Inspire XT (Difenconazole + Propiconazole), Solex (Triademefon + Carbendazim), Amistar Top (Azoxystrobin + Difenconazole), Folicur (Tebuconazole), Score (Difenconazole), and Inspire (Difenconazole) were tested in vitro and in vivo against A. raphani. Inspire XT, Score, and Inspire produced the most inhibition of A. raphani in vitro at 5, 10, and 15 mg∙L−1. The least inhibition was produced by Solex. In vivo, Inspire XT produced the best control of the disease with zero disease incidence and severity, whereas Solex was least effective at controlling the disease. The systemic fungicides tested can be used to manage Alternaria raphani on radish to reduce economic loss.