An epidemic of tomato leaf curl disease in Jammu
306 / 274
Authors
-
KRISHNA KUMAR, RAJEEV MAHAJAN, H.S. CHIB and C.S. KALHA
Keywords:
Tomato leaf curl virus, transmission, host range, electron microscopy, epidemiologyAbstract
Field surveys were conducted in the autumn of 1999-2000 and 2000-2001 in the rain-fed tomato growing belt of Akhnoor of Jammu and leaf curl incidence ranging between 80.00 to 98.00 per cent was recorded in different villages. The symptoms of the disease included curling of leaf lamina and stunting of infected plants, even yellowing in severe cases. The disease was successfully transmitted through graft and whitefly transmission but not by sap inoculation. Electron microscopy revealed the presence of geminate particles in leaf dip preparations. Lantana spp., Hibiscus spp., Ageratum spp., Carica spp., Malvastrum spp. and Euphorbia spp. in and around tomato growing fields of Akhnoor were observed as alternate perennial hosts of whitefly in off-season. These alternate hosts probably act as year-round virus and/or whitefly reservoirs. On the basis of mode of transmission, symptomatology, host range studies, the virus was identified as whitefly transmitted geminivirus naturally occurring in tomato hitherto not reported from Jammu and Kashmir. Among six dates of transplanting from 10th August to 25th of October, maximum yield (65.20 q ha-1) was observed in 1st September transplanted crops, which has lowest monetary loss of Rs. 1.04 lakh ha-l.
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.