Mode of perpetuation of Peronospora alta causing downy mildew of blond psyllium (Plantago ovata)
237 / 106
Authors
-
B.S. RATHORE*
Abstract
Viability of conidia of the downy mildew pathogen of blond psyllium progressively reduced with the increase in storage time and temperature. While increase in RH increased the viability, an increase in storage time had the opposite effect. The survival period of conidia was found to be 9 to 11 days depending on the storage at different levels of temperature and humidity. Germination of conidia decreased with an increase in time of exposure to sunlight. It was found that oospores survived for 55.5 months under laboratory conditions when stored in the form of powdered debris. Viability of oospores was reduced when oospores were mixed with soil and with the increase in storage period. Viability of oospores decreased with increasing depth and duration of burial. Leaf debris, seeds and soil can serve as source of primary inoculum up to 43.5,55.5 and 31.5 months, respectively. The maximum disease incidence occurred when seeds from infected plant were sown 7.5 months after harvest. Further, the whole mount method revealed that 17 per cent seeds contained mycelium and 7 per cent showed presence of oospores in the internal seed tissues except embryo.
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.