Abstract
In the present study, experiments were conducted to test the efficacy of potential isolates of fluorescent pseudomonads against bacterial leaf blight of rice, under field condition. Different isolates of fluorescent pseudomonads were varied in terms of their comparative efficacy against bacterial leaf blight disease. Maximum reduction (50.69%) in disease severity was recorded with isolate FLP 84 followed by Pf 83 (48.26%) during Kharif 2006. However, during Kharif 2007, isolate Pf 83 (58.33%) and FLP 84 (58.33%) exhibited maximum reduction in disease severity. Maximum increase in grain yield (15.71%) and 1000 grain weight (30.22%) was recorded with isolate Pf 83, during Kharif 2006. On the other hand, isolate FLP 84 resulted in maximum increase in grain yield (16.09%) during Kharif2006. In the present investigation, out of five isolates of Pseudomonas sp. evaluated against bacterial blight disease Pf 83 and FLP 84 (isolated from rice phylloplane) resulted higher effectivity in reducing disease severity and increasing grain yield during both cropping seasons. Key words: Bacterial leaf blight of rice, Pseudomonas fluorescens, fluorescent pseudomonads,Xanthomonas oryzae pv. Oryzae.
Highlights
Bacterial leaf blight of rice caused by Xanthomonas oryzae pv. oryzae (Uyeda and Ishiyama) Dowson is the disease of great economic importance in all rice growing areas of the world and is destructive in South East Asia including India (Anonymous, 2002)
Maximum reduction (50.69%) in disease severity was recorded with FLP 84 (Table 1)
Out of five isolates of Pseudomonas sp. evaluated against bacterial blight disease Pseudomonas fluorescens isolate 83 (Pf 83) and FLP 84 were found most effective in reducing disease severity and increasing grain yield, during Kharif seasons 2006 and 2007
Summary
Bacterial leaf blight of rice caused by Xanthomonas oryzae pv. oryzae (Uyeda and Ishiyama) Dowson is the disease of great economic importance in all rice growing areas of the world and is destructive in South East Asia including India (Anonymous, 2002). Bacterial leaf blight of rice caused by Xanthomonas oryzae pv. Biological control has emerged as a promising alternative to the management of plant pathogens. It is key component of integrated disease management and organic crop production. Bioagents stimulate plant growth, even if there is no disease, which results in better yield (Mishra and Sinha, 2000). They are potential candidates for management of plant diseases. Anuratha and Gannamanickam (1987) found that bacterization of rice with P. fluorescens followed by its foliar sprays caused 40 to 60% reduction in bacterial leaf blight. Antagonistic potential of fluorescent pseudomonads with X. oryzae pv. oryzae were studied by several workers including Manmeet and Thind (2002), Rangarajan et al (2003), Velusamy and Gnanamanickam (2003), Babu and Thind (2005), Gent and Schwartz (2005) and Gangwar and Sinha (2010, 2012a, b). Anuratha and Gannamanickam (1987) found that bacterization of rice with P. fluorescens followed by its foliar sprays caused 40 to 60% reduction in bacterial leaf blight. Babu and Thind (2005) reported that P. fluorescens exhibited lowest
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