Viability and survival of Scleortium oryzae Catt. incitant of stem rot of rice preserved in the laboratory vis-Ã -vis over wintering under natural field condition in Manipur
Abstract views: 170
/ 
PDF downloads: 138
Authors
-
JITEN KONTHOUJAM* and GOPAL KUMAR NIRUOLA CHHETRY
Keywords:
rice, stem rot, Sclerotium oryzaeAbstract
Sclerotium oryzae.Catt. the incitant of stem rot of rice produce enormous quantity of sclerotia in the field. Formation of sclerotia was initiated at crop maturity and harvesting inside the stems of infected plants and progressed inside their left over stubbles during the off-season. 92% of fresh sclerotia inside infected stems at harvesting germinated readily within 1-2 days on PDA incubated at 27 + 1 0 C. However, only 87 % of sclerotia collected the next month from left over stubbles in the same sick fields germinated. Viability further declined to 42% during the next nine months (9) after harvest ,when over wintering sclerotia are accumulated in field scum. Sclerotia in their free state were less viable than those over wintering naturally inside left over stubbles or in degenerated plant tissue debris in the top soil in the fields. Viability decreased with age in all the isolates collected from different sources. Age and over wintering medium of sclerotia did not have any significant effect on their vigor in germination and formation of fresh sclerotia in in-vitro.
Downloads
Issue
Section
License
For Authors
As soon as an article is accepted for publication, authors are requested to assign copyright of the article (or to grant exclusive publication and dissemination rights) to the publisher (Indian Phytopathlogical Society). This will ensure the widest possible protection and dissemination of information.
For Readers
While the advice and information in this journal is believed to be true and accurate at the date of its publication, the authors, the editors, nor the publisher can accept any legal responsibility for any errors or omissions that may have been made. The publisher makes no warranty, express or implied, with respect to the material contained herein.
All articles published in this journal are protected by copyright, which covers the exclusive rights to reproduce and distribute the article (e.g., as offprints), as well as all translation rights. No material published in this journal may be reproduced photographically or stored on microfilm, in electronic data bases, on video disks, etc., without first obtaining written permission from the publisher. The use of general descriptive names, trade names, trademarks, etc. in this publication, even if not specifically identified, implies that these names are protected by the relevant laws and regulations.