Role of spot blotch (Bipolaris sorokiniana) in deteriorating seed quality, its management in different wheat genotypes using fungicidal seed treatment
Abstract
The role of spot blotch (Bipoiaris sorokiniana) in deteriorating the seed quality as well as yield was determined by taking six genotypes RAJ 4015, HD 2329, Sonalika, Bhrikuti, CIANO 70/Pruia and NING 8319 of wheat under artificially inoculated conditions. The ear head infection resulted in brown discolouration of spikelets. The disease reduced the ear head weight, number of grains and grain weight per ear head significantly and such losses were in the range of 17-48, 22-59 and 25-56%, respectively as compared to healthy ear head. The number of healthy looking grains per ear head also reduced significantly (51-82%) in infected ear heads whereas number of discoloured and black pointed grains per ear heads increased in infected ear head in six genotypes. Thousand grain weight of discoloured and black pointed grains was reduced over healthy looking grains and ranged from 13.3- 65.6 and 2.5-33.4%, respectively. Among the genotypes, Sonalika was affected most whereas NING 8319 was least affected. At harvest, the incidence of B. sorokiniana ranged between 90-100% in discoloured, 30-90% in black pointed and 20-60% in healthy looking seeds. The losses in viability and germination were in the range of 57-70 and 90-100% in discoloured seeds, 4-9 and 45-47% in black point infected seeds, respectively as compared to healthy looking seeds in HD 2329 and Sonalika. Amongst fungicides, pre sowing treatment with Vitavax (carboxin) @ 2.5 glkg and Thiram @ 3.0 gI kg of seed, eradicated the seed borne infection of B. sorokiniana and Alternaria tenuis in healthy looking seeds. The infection of B. sorokiniana was 47 and 22% due to treatment of discoloured seeds with Vitavax and Thiram as compared 10 95 and 90% in untreated check, respectively in HD 2329 and Sonalika. The seed germination was 38, 0 and 20% in case of untreated seeds whereas it increased up to 90, 17 and 70% in case of Vitavax and 96, 28 and 85% in Thiram treated seeds of healthy looking, discoloured and black pointed infected categories, respectively in HD 2329.
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.