Vol. 11, Issue 12 (2022)

Author(s):
D Prathyusha, AK Patibanda, V Prasanna Kumari, P Madhusudhan, K Jayalalitha and V Srinivasa Rao

Abstract:
Rice blast disease caused by Pyricularia oryzae is a major threat to the farmers as the disease severity may lead up to 80% crop loss in severe conditions. A laboratory experiment was conducted at Department of Plant Pathology, Acharya N.G. Ranga Agricultural University, Agricultural College, for testing the efficacy of eight different single and combination fungicides adopting poisoned food method against the pathogen Pyricularia oryzae causing rice blast disease. The experiment was carried out in a completely randomized design with eight treatments including control following 3 replications of each. Three concentrations (R – recommended dose; R/2 and 2R) each of different fungicides viz., Beam (Tricyclazole 75% WP @ 0.06%), Amistar (Azoxystrobin 25% SC @ 0.10%), Fujione (Isoprothiolane 5% EC @ 0.15%), Kasugamycin @ 0.25%, Folicur (Tebuconazole 25% EC @ 0.15%), Nativo 75% WG (Trifloxystrobin 50% + Tebuconazole 25% WG @ 0.08%), Custodia (Azoxystobin + Tebuconazole @ 0.15%) and Filia (Propiconazole + Tricyclazole @ 0.10%) were evaluated against the radial growth of pathogen. Results showed that except two fungicides viz., Kasugamycin and Azoxystrobin rest all the fungicides fully inhibited (100% inhibition) the mycelial growth of the pathogen at all the three different concentrations compared to control.