PROCEEDINGS OF THE SECOND HORTICULTURE SEMINAR ON SUSTAINABLE HORTICULTURAL PRODUCTION IN THE TROPICS 6 th to 9 th August 2002, Jomo Kenyatta University of Agriculture and Technology (JKUAT), Juja – KENYA Editors: Editors: Editors: Editors: Wesonga, J.M.; T. Losenge; C.K. Ndung’u, K. Ngamau, J.B.M. Njoroge, F.K. Ombwara and S.G. Agong (JKUAT, Kenya) A. Fricke; B. Hau and H. Stützel (Hannover, Germany) Department of Horticulture Jomo Kenyatta University of Agriculture and Technology, Kenya, in collaboration with Institute of Vegetable and Fruit Science and Institute of Plant Diseases and Plant Protection University of Hannover, Germany DA A D-GERMA N A CA DEMIC EX CHA NGE SERVICES