caa a22 4500 467929416 CHVBK 20180406152939.0 cr unu---uuuuu 170328e20060201xx s 000 0 eng 10.1007/s10658-005-2928-7 doi (NATIONALLICENCE)springer-10.1007/s10658-005-2928-7 Effect of Essential Oils from Citrus Varieties on in vitro Growth and Sporulation of Phaeoramularia angolensis Causing Citrus Leaf and Fruit Spot Disease [Elektronische Daten] [Jean Kuate, Jacob Foko, Sali Ndindeng, Pierre Jazet-Dongmo, Eric Fouré, François Damesse, Bella-Manga,, Daniel Ducelier] Citrus leaf and fruit spot disease caused by Phaeoramularia angolensis is a serious production constraint in tropical Africa. In previous studies, essential oils extracted from fruit peels of two tolerant varieties exhibited a strong antifungal activity in vitro against P. angolensis as compared to oils from susceptible ones. In order to investigate if the susceptibility of citrus varieties is associated with the antifungal activity of their essential oils, some 22 varieties of different susceptibility levels (tolerant, susceptible and highly susceptible) and belonging to different botanical groups were studied. Oils extracted from fruit peels were evaluated for their activity against radial growth and sporulation using the poisoned food technique. The optimal doses for growth inhibition and conidial reduction were 2500 and 1000ppm, respectively. At these doses, radial growth and sporulation exceeded the untreated control respectively for four and nine varieties suggesting that oils from these varieties promote fungal development. In general, oils from the tolerant group were most effective in reducing radial growth irrespective of dose. The highly susceptible group ranked first in reducing sporulation at dose 1000ppm (45.93%) while at higher doses of about 2000-2500ppm, oils from the tolerant varieties could reduce sporulation up to 100%. The marked dose effect in reducing sporulation suggests that there may be different compounds acting with changing dose. Botanically, oils from pummelo (Citrus maxima, tolerant group), were best in reducing radial growth (>87% inhibition) while those from grapefruits (C. paradisi, highly susceptible group) were most effective in reducing sporulation (>64% reduction). Springer, 2006 citrus nationallicence essential oils nationallicence Phaeoramularia angolensis nationallicence radial growth and sporulation nationallicence Kuate Jean Institute of Agricultural Research for development (IRAD), P.O. Box 2067, Yaounde, Cameroon aut Foko Jacob University of Dschang/CARFOP, P.O. Box 409, Dschang, Cameroon aut Ndindeng Sali Institute of Agricultural Research for development (IRAD), P.O. Box 2067, Yaounde, Cameroon aut Jazet-Dongmo Pierre University of Douala, Faculty of Sciences, P.O. Box 24157, Douala, Cameroon aut Fouré Eric African Centre for Research in Bananas and Plantains (CARBAP), P.O. Box 832, Douala, Cameroon aut Damesse François Institute of Agricultural Research for development (IRAD), P.O. Box 2067, Yaounde, Cameroon aut Bella-Manga, Institute of Agricultural Research for development (IRAD), P.O. Box 2067, Yaounde, Cameroon aut Ducelier Daniel Institute of Agricultural Research for development (IRAD), P.O. Box 2067, Yaounde, Cameroon aut European Journal of Plant Pathology Kluwer Academic Publishers 114/2(2006-02-01), 151-161 0929-1873 114:2<151 2006 114 10658 https://doi.org/10.1007/s10658-005-2928-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10658-005-2928-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kuate Jean Institute of Agricultural Research for development (IRAD), P.O. Box 2067, Yaounde, Cameroon aut NATIONALLICENCE 700 1- Foko Jacob University of Dschang/CARFOP, P.O. Box 409, Dschang, Cameroon aut NATIONALLICENCE 700 1- Ndindeng Sali Institute of Agricultural Research for development (IRAD), P.O. Box 2067, Yaounde, Cameroon aut NATIONALLICENCE 700 1- Jazet-Dongmo Pierre University of Douala, Faculty of Sciences, P.O. Box 24157, Douala, Cameroon aut NATIONALLICENCE 700 1- Fouré Eric African Centre for Research in Bananas and Plantains (CARBAP), P.O. Box 832, Douala, Cameroon aut NATIONALLICENCE 700 1- Damesse François Institute of Agricultural Research for development (IRAD), P.O. Box 2067, Yaounde, Cameroon aut NATIONALLICENCE 700 1- Bella-Manga Institute of Agricultural Research for development (IRAD), P.O. Box 2067, Yaounde, Cameroon aut NATIONALLICENCE 700 1- Ducelier Daniel Institute of Agricultural Research for development (IRAD), P.O. Box 2067, Yaounde, Cameroon aut NATIONALLICENCE 773 0- European Journal of Plant Pathology Kluwer Academic Publishers 114/2(2006-02-01), 151-161 0929-1873 114:2<151 2006 114 10658 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer