Use of Chemical Fungicides for the Management of Rice Blast (Pyricularia Grisea) Disease at Jyotinagar, Chitwan, Nepal

Abstract

Rice blast caused by Pyricularia grisea Sacc. is the important disease of rice and different fungicides against this disease were evaluated in summer 2014 at Karma Research and Development Center, Jyotinagar, Chitwan, Nepal. A susceptible rice cultivar ‘Mansuli’ was planted in randomized complete block design and fungicides viz. Tricyclazole 22% + Hexaconazole 3% SC (0.2%), Streptomycin 5% + Thiophanate Methyl 50% WP (0.15%), Prochloraz 25% EC (0.3%), Kasugamycin 2% WP (0.2%), Hexaconazole 4% + Zineb 68 % WP (0.2%) and Udaan (Hexaconazole 3% SC) (0.2%) were sprayed thrice at weekly interval starting from the booting stage. All these fungicides were found to be effective in controlling leaf and neck blast disease as compare to control one. Among them, Tricyclazole 22% + Hexaconazole 3% SC was found to be the most effective with least leaf blast severity (6.23%), neck blast incidence (8.97%), and highest percentage disease control (87.08% and 79.62% in leaf blast and neck blast respectively) and grain yield (4.23 t/ha) followed by Prochloraz 25% EC (0.3%) and Udaan (Hexaconazole 3% SC) (0.2%). It is therefore concluded that Tricyclazole 22% + Hexaconazole 3% SC fungicide could be used to control rice blast at weekly interval starting from the booting stage for three times. Int J Appl Sci Biotechnol, Vol 3(3): 474-478

Oligomycins Inhibit Magnaporthe oryzae Triticum and suppress wheat blast disease

“…Polyoxins are well-known as inhibitors of cell wall biosynthesis that suppress the formation of germ tubes and appressoria [41, 68–70]. The findings of this research were also comparable to the activities of several commercially available fungicides such as blasticidin-S, kasugamycin, streptomycin and tricyclazole, which demonstrated strong antifungal efficacy against many phytopathogenic fungi, like rice blast fungus M. oryzae Oryzae (MoO) [11, 71–73]. This study for the first time showed that two secondary metabolites of Streptomyces spp.…”

Characterization of fluorescent Pseudomonas from Oryza sativa L. rhizosphere with antagonistic activity against Pyricularia oryzae (SACC.)

“…Rice blast, caused by Pyricularia oryzae (teleomorph = Magnaporthe oryzae) is one of the most important diseases, due to its worldwide distribution, destructiveness and high degree of pathogenicity (Thuan et al, 2006;Rodríguez et al, 2007). Rice blast can cause up to 100% in yield reduction, depending on the cultivar susceptibility, cropping technology and climatic conditions (Prabhu et al, 2009, Magar et al, 2015. Although infections are mostly reported to occur in leaves and stems, seeds and roots may also be infected by P. oryzae, using the typical developmental processes of root-infecting fungi (Sesma and Osbourn, 2004).…”

Potential of Finger Millet Indigenous Rhizobacterium Pseudomonas sp. MSSRFD41 in Blast Disease Management—Growth Promotion and Compatibility With the Resident Rhizomicrobiome

“…Although finger millet is considered a hardy crop, it is affected by more than 20 diseases, of which blast disease caused by Pyricularia grisea is the most devastating (Prajapati et al, 2013 ; Waghunde et al, 2013 ; Magar et al, 2015 ; Cruz and Valent, 2017 ). The pathogen infects different parts and stages of the plants from seedling to grain formation, causing diamond-shaped lesions and premature drying of young leaves, affecting the panicle and causing neck and/or finger blast leading to yield loss up to 100% that result in economic loss to farmers and ultimately food crisis (Senthil et al, 2012 ; Prajapati et al, 2013 ; Negi et al, 2015 ).…”

“…The pathogen infects different parts and stages of the plants from seedling to grain formation, causing diamond-shaped lesions and premature drying of young leaves, affecting the panicle and causing neck and/or finger blast leading to yield loss up to 100% that result in economic loss to farmers and ultimately food crisis (Senthil et al, 2012 ; Prajapati et al, 2013 ; Negi et al, 2015 ). Control of blast disease is a serious and challenging issue relying heavily on chemical pesticides like organophosphorus fungicides which have been reported to be highly effective (Kumar and Kumar, 2011 ; Magar et al, 2015 ). However, extended use of chemical pesticides has resulted in the development of pesticide-resistant fungal pathogens, with negative effects on the ecosystem, soil fertility, and water quality, leading to serious health problems including birth defects (Hawkins et al, 2014 ; Hollomon, 2016 ).…”