Control of<Emphasis Type="Italic">Penicillium digitatum</Emphasis> on citrus fruit using two plant extracts and study of their mode of action |
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| Authors: | Sissay B Mekbib Thierry J C Regnier Lise Korsten |
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| Institution: | (1) Dept. of Microbiology and Plant Pathology, University of Pretoria, 0002 Pretoria, South Africa;(2) Dept. of Plant Science, Alemaya University, DireDawa, Ethiopia |
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| Abstract: | Extracts from two plants from Ethiopia,Withania somnifera andAcacia seyal, were evaluated for their potential as natural biopesticides and to study their mode of action. Methanolic extracts of these
plants were testedin vivo on citrus fruit for their efficacy to controlPenicillium digitatum when applied on wounded or unwounded fruit surfaces. Relative to the control, 70% and 75% of wound — inoculated fruit did
not develop decay symptoms for up to 21 days of storage at 25°C and >85% r.h. An increase in cell wall-bound phenolics was
evident in wounded fruit treated with plant extracts and inoculated with a spore suspension ofP. digitatum. Scanning electron microscopy revealed deposition of crystalline plant material sticking to the pathogen and around the wound
site. The application of the plant extracts increased the epiphytic background total microbial population but decreased diversity.
http://www.phytoparasitica.org posting May 7, 2007. |
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| Keywords: | Citrus fruit postharvest diseases natural compounds plant phenolics host resistance |
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