First report on association of Meloidogyne graminicola in twister disease of onion: an emerging problem in coastal tract of India

Authors

  • SURESH PATIL, V.B. NARGUND, GURUDATTH HEGDE, S. LINGARAJU and A. SRINIVASARAGHAVAN*

DOI:

https://doi.org/10.24838/ip.2017.v70.i1.48993

Keywords:

Meloidogyne graminicola, onion, RKN, twisting

Abstract

Onion crop grown in west coast of sothern India has been seriously affected by the problem of onion twister disease charetorized by the symptoms viz., twisting of leaf and neck, slight to prominent galls in roots with root proliferation and scanty discolored root system. A survey carried out during rabi/summer of 2011-12 and 2012-13 revealed the prevalence of such disease in all the major onion cultivating areas of Karnataka (India). The highest disease index of 24.05 and 29.37 per cent was noticed Uttar Kannada district during 2011-12 and 2012-13 respectively. Aetiological investigations revealed the association of a nematode with symptomatic onion plants having root galls. Nematode when inoculated, resulted in slender plants with typical abnormal elongation of leaf with proliferation and neck twisting during initial stage and at later stage whole plant appeared to be abnormal showing typical twisting symptoms. Artificially inoculated plant with typical symptoms were found to have severe galling with typical hooks like roots. At later stage discoloration and complete destruction of root system demonstrated the Koch’s postulate for the involvement of isolated nematode in the disease. Identity of the nematode was confirmed as Meloidogyne graminicola by morphometric and perineal pattern studies. This is the first report of association of rice root knot nematode involved in onion twister disease.

Downloads

Published

2017-03-23

Issue

Vol. 70 No. 1 (2017): Indian Phytopathology

Section

Research Articles

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.

How to Cite

GURUDATTH HEGDE, S. LINGARAJU and A. SRINIVASARAGHAVAN*, S. P. V. N. (2017). First report on association of Meloidogyne graminicola in twister disease of onion: an emerging problem in coastal tract of India. Indian Phytopathology, 70(1), 104-108. https://doi.org/10.24838/ip.2017.v70.i1.48993