Evaluation on the efficacy of different chemical fungicides against rice blast (Pyricularia oryzae) under field condition at Siraha, Nepal

Abstract

Rice blast (Pyricularia oryzae) is a serious disease which hampers production of rice. The field research was conducted in PMAMP, PIU, Siraha Dhangadimai-10, Kuduwa to evaluate the efficacy of various chemicals against rice blast. The experiment was carried out in Completely Randomized Block Design (RCBD) with 7 treatments (6 chemicals and 1 control) and each treatment was replicated 3 times. Chemicals namely Hexaconazole5%(SC), Carbendazim12%+ Mancozeb 63%(WP), Azoxystrobin 18.2 % + Difenoconazole 11.4% (SC), Thiophonate-Methyl 70%wp, Kasugamycin 2% Wp and Floxystrobin+tubuconazole were used for this experiment. Azoxystrobin18.2 % + Difenoconazole 11.4 % (SC) was recorded as the best chemical followed by Carbendazim12%+Mancozeb 63%WP to control rice blast. The highest disease severity was seen at the control plot. The highest yield was observed in plot with Azoxystrobin+Difenconazole (5.16mt/ha) followed by Carbendazim12%+ Mancozeb 63%WP(5.12mt/ha).