Pertanika J. Trop. Agric. Sci. 41 (1): 423 - 440 (2018) ISSN: 1511-3701 © Universiti Putra Malaysia Press TROPICAL AGRICULTURAL SCIENCE Journal homepage: http://www.pertanika.upm.edu.my/ E-mail addresses: marcaphy@gmail.com (MM Segbeia), hmamoatey@yahoo.com (HM Amoatey), jnckay@gmail.com (JK Ahiakpa), emmaquart@yahoo.com (EK Quartey), andysark2000@gmail.com (AS Appiah), jnunoo@gmail.com (J Nunoo), kusiadjei@yahoo.co.uk (R Kusi-Adjei) * Corresponding author Article history: Received: 10 June 2017 Accepted: 08 November 2017 ARTICLE INFO Field evaluation of tomato varieties/breeding lines against tomato yellow leaf curl virus disease (TYLCV) MM Segbeia 1 , HM Amoatey 2,3 , JK Ahiakpa 4 *, EK Quartey 3,5 , AS Appiah 5 , J Nunoo 3 and R Kusi-Adjei 5 1 OCP Ghana LTD, No. 9 Kwa bena Duffour Road, Airport Residential Area, Accra, Ghana 2 Department of Nuclear Agriculture and Radiation Processing, Graduate School of Nuclear and Allied Sciences, University of Ghana, P. O. Box AE 1, Atomic-Accra, Ghana 3 Nuclear Agriculture Research Centre, Biotechnology and Nuclear Agriculture Research Institute, Ghana Atomic Energy Commission, P. O. Box LG 80, Legon, Kwabenya-Accra, Ghana 4 Research Desk Consulting Ltd., P. O. Box WY 2918, Accra, Ghana 5 Biotechnology Centre, Biotechnology and Nuclear Agriculture Research Institute, Ghana Atomic Energy Commission, P. O. Box LG 80, Legon-Accra, Ghana ABSTRACT Tomato Yellow Leaf Curl Virus (TYLCV) is currently the most devastating virus of cultivated tomatoes in tropical and subtropical regions, accounting for signiicant yield losses in cultivated tomato in Ghana. Severe population outbreaks of the whitely vector (Bemisia tabaci), are usually associated with high incidence of the disease. Resistance breeding is the surest solution to TYLCV in developing viable seeds for increased tomato production in Ghana. The Wild tomato (Solanum pimpinellifolium L.) is a recognised crop Wild species (CWS) with resistance genes to different diseases including the TYLCV disease and possesses good fruit quality traits in Ghana. Three (3) cultivated tomato varieties and seven breeding lines developed from crosses between the Wild tomato and three hybrids, three backcrossed lines and the Wild tomato were evaluated with their parents against TYLCV disease under local ield conditions. Field appraisal of whitely populations, disease incidence and severity, agronomic and yield characteristics of the tomato varieties/breeding lines were undertaken to hasten selection of tolerant/ resistant varieties or breeding lines in the breeding programme. Wild tomato (ISS AP = 0.31 and ISS DP = 0.76) and Woso (ISS AP