MOLECULAR CHARACTERIZATION AND NON-CHEMICAL MANAGEMENT OF ROOT-KNOT NEMATODES (Meloidogyne spp.) ON AFRICAN NIGHTSHADES IN SELECTED PARTS OF KENYA SHEM BONUKE NCHORE (M. Sc Plant Path.) REG NO: A99/23682/2013 A THESIS SUBMITTED IN FULFILMENT OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE OF DOCTOR OF PHILOSOPHY (PLANT PATHOLOGY), KENYATTA UNIVERSITY. APRIL 2016