Fargette Denis auteur aut IRD Colon L.T. auteur aut IRD Bouveau R. auteur aut IRD Fauquet Claude auteur aut IRD text journalArticle eng text/pdf reformatted digital access Components of resistance of cassava (Manihot esculenta) to African cassava mosaic virus (ACMV) and their interrelationships were confirmed and quantified in a series of experiments at Adiopodoumé (Ivory Coast, West Africa). The response to virus infection and to Bemisia tabaci infestation of a large collection of cassava, including local cultivars and others derived from inter-specific M. glaziovii hybrids was assessed. A consistent correlation was found between virus titre, symptom intensity, disease incidence and non-systemicity (recovery) which suggests that they are different expressions of the same genetic resistance. By contrast, there was no correlation between whitefly infestation and incidence of ACMV, suggesting that resistance to virus and vector are determined by two distinct genetic mechanisms. Several improved cultivars derived from inter-crossing cassava with M. glaziovii as well as some local cultivars were highly resistant and combined low susceptibility, low symptom intensity, low virus content and high level of recovery. Although yield losses ranged from 10% to 30% in such resistant cultivars, the combined effect of high field resistance and high rate of recovery lead to low disease incidence and limited yield losses, even in areas of high infection pressure such as Adiopodoumé. (Résumé d'auteur) specialized MALADIE DES PLANTES PHYTOVIRUS CULTIVAR VARIETE RESISTANTE RELATION HOTE PARASITE RENDEMENT INFECTION COTE D'IVOIRE 076MALPLA06 102 7 645-654 1996 0929-1873 https://www.documentation.ird.fr/hor/fdi:010007386 10.1007/BF01877245 0929-1873 [F B010007386] https://www.documentation.ird.fr/hor/fdi:010007386 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_45-46/010007386.pdf IRD - Base Horizon / Pleins textes 1996-11-05 2006-06-06 fdi:010007386 fre