Evaluation oflocally available tomato varieties and introductions for resistance tobacterial speck andbacterial spot diseases in Tanzania
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Department of Crop Science & Production, Sokoine University of Agriculture P.O. Box 3005, Morogoro, Tanzania
Danish Seed Health Centrę for Developing Countries, Department of Plant Biology Plant Pathology Section, The Royal Yeterinary and Agricultural University Thorvaldsensve] 40, Frederiksberg C, DK-1871, Copenhagen, Denmark
Corresponding author
Kenneth C. Shenge
Ahmadu Bello Uniyersity, Department of Crop Protection, PMB 1044, Zaria, Nigeria
Journal of Plant Protection Research 2007;47(2):103-111
Four tomato {Lycopersicon esculentum Mili.) varieties commonly grown by tomato farmers in Tanzania were evaluated for resistance to bacterial speck {Pseudomonas syringae pv. tomato) and bacterial spot (Kanthomonas vesicatoria) diseases, along with five introductions under screenhouse andfield conditions. The four tomato varieties were Cal J, Moneymaker, Tanya and Roma YF. Seeds of thetomato yarieties were purchased from seed vendors in the open market. The introductions that wereincluded in the study were Bravo, Taxman, Stampede (from Sakata-Mayford Seeds (Pty) Ltd, SouthAfrica), Torąuay and BSS436 (from Bejo Żaden B.Y, The Netherlands). In the screenhouse, results indicated that all the tomato yarieties were susceptible to the two diseases, and suffered moderate to severeinfection levels. The performance of the introductions against bacterial speck under screenhouse conditions was yariable. All the introductions showed high levels of susceptibility to bacterial spot.Under field conditions, incidence of the diseases was high in all the locally ayailable yarieties tested, ayeraging 87% for bacterial spot and 82.3% for bacterial speck. The results of this study indicate that all the locally ayailable tomato yarieties included in the study were highly susceptible to bacterialspeck and bacterial spot diseases.
The authors have declared that no conflict of interests exist.
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