Title page for ETD etd-01142005-090329

Document Type Doctoral Thesis
Author Adandonon, Appolinaire
URN etd-01142005-090329
Document Title Damping-off and stem rot of cowpea in Benin caused by Sclerotium Rolfsii
Degree DPhil (Microbiology and Plant Pathology)
Department Microbiology and Plant Pathology
Advisor Name Title
Dr M Tamo Co-Supervisor
Prof T A S Aveling Supervisor
  • cowpea
  • damping-off and stem rot
  • Trichoderma
  • Sclerotium rolfsii
  • screening
  • polyphenols
  • Moringa oleifera
  • ITS rDNA
  • integrated control
  • genetic diversity
  • biocontrol
Date 2005-06-13
Availability unrestricted
The damping-off and stem rot disease syndrome is harmful to many cultivated crops. Damping-off and stem rot caused by Sclerotium rolfsii Sacc. on cowpea results in yield losses with serious socio-economic implications. The objectives of the present study were to investigate the occurrence of the diseases in Benin, study etiology and factors influencing the diseases, and develop strategies for the control of the diseases in the field. Results showed that the diseases are distributed countrywide. Sclerotium rolfsii was the main causal agent but minor pathogens, namely Pythium sp., Rhizoctonia solani Khn and Phoma pomorum Thm were also recorded. In the Oum valley, the diseases were favoured by soil moisture and S. rolfsii initial inoculum that were higher closer to the river. Sclerotium rolfsii isolates collected in the valley showed genetic diversity in terms of pathogenicity, mycelial compatibility groups and ITS rDNA sequences. A paper-based screening method was found to be a rapid laboratory method for screening for resistance in cowpea cultivars. Furtheremore, Moringa oleifera L. leaf extracts, Trichoderma Kd 63 and Trichoderma IITA 508 significantly reduced the disease incidence. The best disease control was recorded in the field when M. oleifera seed treatment was integrated with a soil sprinkle of Trichoderma. The present work provides information on damping-off and stem rot of cowpea in Benin and control strategies for ecologically sustainable cowpea production.

2005, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria

Please cite as follows:

Adandonon, A 2005, Damping-off and stem rot of cowpea in Benin caused by Sclerotium Rolfsii, DPhil thesis, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-01142005-090329 / >

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