Influence of time of sowing and groundnut varieties on the incidence and severity of late leaf spot (Phaeoisariopsis personata) of groundnut

Authors

  • UTPAL DEY*, D.N. DHUTRAJ, H.N. KAMBLE, A.P. SURYAWANSHI and ANUP DAS

Keywords:

Arachis hypogaea, defoliation, PDI, Phaeoisariopsis personata, severity, sowing dates

Abstract

The field experiment was conducted to study the influence of sowing dates on the incidence and severity of late leaf spot on groundnut. The study on incidence, severity, corresponding defoliation, frequency and size of the leaf spot revealed that all these aspects were significantly influenced by the sowing dates and crop varieties which directly affected the pod yield and test weight. The crop sown early on 25th June exhibited maximum late leaf spot disease incidence (range 46.45-56.25%), disease severity (range 40.12-49.58%), defoliation (range, 13.18-18.36%), frequency (range, 1.38-1.76/mm2) and size (range, 1.44-1.52/mm2) followed by the crop sown on 10th June and 25th July. Among the groundnut cultivars, susceptible cv. JL-24 exhibited maximum disease incidence (range, 35.83-56.25%), disease severity (range, 31.07-49.58%), defoliation (range, 7.70-18.36%), frequency (range, 1.21-1.76/mm2) and size (range, 1.29-1.52/mm2), followed by TAG-24, TG-26 and LGN-1. The late leaf spot disease incidence, severity and corresponding defoliation recorded at various intervals were found to be increased with the age of the crop and both were found maximum at the physiological maturity of the crop. The results obtained in respect of the influence of sowing dates and crop varieties on pod yield and test weight indicated that the crop sown early (25th June) was affected severely with the disease and thereby gave reduced pod yield (range, 1197-1679 kg/ha) and test weight (25.19-29.40 g) followed by the crop sown on 10th July and 25th July. The epidemiological implications of the disease occurring simultaneously are important because the establishment of the disease management strategies depends on the disease interactions.

Downloads

Issue

Vol. 68 No. 3 (2015): 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

A.P. SURYAWANSHI and ANUP DAS, U. D. D. D. H. K. (2015). Influence of time of sowing and groundnut varieties on the incidence and severity of late leaf spot (Phaeoisariopsis personata) of groundnut. Indian Phytopathology, 68(3), 279-286. http://epubs.icar.org.in/ejournal/index.php/IPPJ/article/view/49837