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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 11 to 12 of 12 (0.027 seconds)| 11 |
Damping-off and stem rot of cowpea in Benin caused by Sclerotium RolfsiiAdandonon, Appolinaire 14 January 2005 (has links)
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 Kühn and Phoma pomorum Thüm were also recorded. In the Ouémé 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. / Thesis (DPhil (Microbiology and Plant Pathology))--University of Pretoria, 2006. / Microbiology and Plant Pathology / unrestricted
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Erdflechten und ihre Gesellschaften in Nordhessen mit besonderer Berücksichtigung der morphologischen und genetischen Variabilität bei Cladonia furcata (Hudson) Schrader / Terricolous lichens and their communities in North Hessen (Germany) with special emphasis on the morphological and genetical variability of Cladonia furcata (Hudson) SchraderGünzl, Bettina 22 January 2004 (has links)
No description available.
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