CBN-V Video Archives - S8-02
Host Plant Resistance for Management of Cassava Pest with Emphasis on Whiteflies

Bellotti A.C., A. Bohórquez, B. Arias, C. Mba and J. Tohme

International Center for Tropical Agriculture -CIAT-, A.A. 6713 Cali, Colombia a.bellotti@cgiar.org

        Host plant resistance (HPR) to whiteflies is rare in cultivated crops. At the International Center for Tropical Agriculture (CIAT) in Colombia, more than 5000 cassava clones have been evaluated for resistance to the whitefly, Aleurotrachelus socialis. Several cultivars with moderate to high levels of resistance have been identified. Nymphal mortality was highest on the resistant cassava clones MEcu 72 (72.5%) and MEcu 64 (71.0%) and lowest on susceptible clones CMC 40 (33%) and MBra 12 (25.0%). When feeding on resistant genotypes, A. socialis has less oviposition, longer development periods, reduced size and higher mortality than when feeding on susceptible genotypes. Several whitefly resistant hybrids have been developed using MEcu 72 as the resistant female parent. These hybrids are being evaluated for release by the Colombian Ministry of Agriculture and Rural Development. The screening of a mapping population derived from a cross using MEcu 72 as the resistant parent and M Col 2246 as the susceptible parent is underway. Molecular genetic markers closely linked to the resistance gene(s) would allow the identification of resistant materials in breeding programs and improve the efficiency of cassava breeding.

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