Management of citrus scab caused by Elsinoe fawcettii
695 / 790
Authors
-
DALJEET SINGH, S.P. KAPUR and KULDIP SINGH
Punjab AgricuLturaL University, Regional Research Station, Faridkot 151 203
Keywords:
Citrus scab, ELsinoefawcetii, fungitoxicants, biologicalcontrol agents, antagonists, resistanceAbstract
Citrus scab caused by Elsinoe fawcettii is a serious disease of citrus in India. It can cause severe deformation of foliage and stunting of certain citrus rootstocks. This results in poorer quality and smaller caliper of rootstocks for budding. Moreover, premature leaf and fruit drop caused by this malady result in heavy losses to orchardists. Considering the seriousness of the disease in Punjab, the present study was conducted. Blitox-50 (copper oxychloride), Bordeaux mixture, Derosal [carbendazim], chlorothalonil and Indofil M-45 [mancozeb] at 1000 ppm each were tested against the pathogen in in vitro culture resulting in 81.1, 88.0, 77.2, 76.6 and 64.4% growth inhibition of the pathogen over untreated control, respectively. Blitox 50 at 0.3%, Bordeaux mixture at 1%, Derosal at 0.2%, chlorothalonil at 0.2% and Indofil M-45 at 0.3% reduced the disease incidence in the field by 47.8, 69.5, 46.2, 50.4 and 40.4% over control, respectively. Trichoderma viride, T. ressei [T. longibrachiatum] and Epicoccum purpurascens [E. nigrum] showed antibiosis whereas T. harzianum and T. koningii showed mycoparasitism on the pathogen in in vitro culture. T. harzianum and E. purpurascens reduced the disease incidence in the field on spraying by 17.8 and 10%, respectively. Out of 64 citrus species/cultivars screened under natural conditions in the field, 45 were free from infection, 4 tolerant, 7 moderately susceptible, 4 susceptible and 5 highly susceptible with 0, 0-10%, 11-20%, 21-30%, and above 30% disease index, respectively.
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.