SURVEY FOR THE OCCURRENCE OF RICE LEAF BLAST IN PRAKASAM AND SRI POTTI SREERAMULU NELLORE DISTRICT OF ANDHRA PRADESH

VARAPRASADA RAO¹*, P. ANIL KUMAR^2
1ICAR-Krishi Vigyan Kendra, Darsi, Prakasam, 523247, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India
²Department of Plant Pathology, Agricultural College, Bapatla, 522101, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India
* Corresponding Author : varaprasadakvk@gmail.com

Received : 14-05-2018     Accepted : 25-05-2018     Published : 30-05-2018
Volume : 10     Issue : 10       Pages : 6096 - 6099
Int J Agr Sci 10.10 (2018):6096-6099

Keywords : Leaf blast, Percent disease severity, Pyricularia grisea
Conflict of Interest : None declared
Acknowledgements/Funding : Author thankful to ICAR-Krishi Vigyan Kendra, Darsi, Prakasam, 523247, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India for providing the opportunity to conduct the work.
Author Contribution : All author equally contributed

A roving survey was conducted for the occurrence and percent disease severity of rice leaf blast caused by Pyriculariagrisea Sacc. in Prakasam and Sri Potti Sreeramulu Nellore (SPSR) districts of Andhra Pradesh during Kharif 2010-2011 and 2011-2012 and Rabi 2010-2011 and 2011-2012. In Prakasam district32.2% mean disease severity was recorded during Kharif 2010-2011 and 2011-2012 and 34.9% mean percent disease severity (PDS) was recorded during Rabi 2010-2011 and 2011-2012. Highest mean PDS (34.1%) was recorded in Chimakurthy mandal and least mean PDS (27.1%) was recorded in Kandukuru mandal. During Rabi 2010-2011 and 2011-2012, Darsi mandal recorded highest mean disease severity (41.1%) and least mean PDS (35.8%) was recorded in Kandukuru mandal. During Kharif 2010-2011 and Kharif 2011-2012 in SPSR Nellore district recorded 34.0% of mean disease severity. Among the different mandals surveyed, Kavali mandal had highest PDS (34.2%) and Podalakuru mandal recorded least mean PDS (27.4%). During Rabi 2010-2011 and Rabi 2011-2012 in SPSR Nellore district, Kavali mandal had highest mean disease severity and Podalakuru mandal recorded least disease severity. The transplanting and tillering stages were highly susceptible for blast when mean values were compared for their progression from one stage to the other.

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