Symptomatological significance and characterization of susceptibility / resistance group among low land rice cultivars towards stem rot of rice in Manipur valley
124 / 83
Authors
-
JITEN KONTHOUJAM*, G.K.N. CHHETRY and RANJIT SHARMA
Abstract
Stem rot of rice caused by Sclerotium oryzae. Catt., has rapidly spread throughout the Manipur valley during the past 9 years ( 1997-2005). It has infected all cultivated low land rice cultivars either of local or exotic origin to Manipur. None of the 33 cultivars studied in current roving and fixed location surveys during 2004-2005 Kharif, were resistant or highly resistant against the disease. The degree of susceptibility among cultivars differed with marked symptomatological difference in size, number and position of lesions on the infected stems above the field water level. Highly susceptible cultivars exhibited more number of lesions (3.0-8.5), larger coalesced lesion size (72.6 sq.mm - 406.2 sq.mm) at crop maturity and extended to higher positions on the stems up to 6.6 inches above the soil, in fields with 2" water level during cropping period. The size, number and positions of the lesions decreased with increasing resistance of the individual cultivars.
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.