Presidential address - Advances in bacterial blight of cotton
131
Authors
-
J.P. VERMA
Abstract
Bacterial blight of cotton induced by Xanthomonas campestris pv. malvacearum (Xcm) was first recorded in Alabama (USA) in 1891, but in India it was reported in 1918 from Madras. Several epiphytotics occurred during 1948-1952, and the disease was well established in the 1960s in India, when a campaign was started to replace the rain-fed indigenous diploid cottons by high-yielding but susceptible tetraploid hirsutum and barbadense cottons. Irrigation and high nitrogenous fertilisers given to achieve yield potentials, also proved favourable for the disease development. In India, the disease is known to occur in all the cotton-growing areas with an annual losses varying from 5 per cent to 25 per cent. During this period, several cvs belonging to all thefour species were rejected (Verma and Singh, 1971a, 1974a) due to their high susceptibility to blight of cotton e.g., Karungani-1, Westerns, Cambodia, Madras, Uganda, 79-2, 458-1, Bar 12/1, 12/2, T-96, LL-54, LL-55, etc. Further, all the cvs grown in India were susceptible to the disease, which reduced the 'life' of a cv and it was considered essential (Verma and Singh, 1974b; Verma et al., 1980) to have, at least, tolerance to the disease before a cv was released for cultivation in any part of India.
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.