OCCURRENCE, DISTRIBUTION AND EVALUATION OF SOME COWPEA (VIGNA UNGUICULATA (L.) WALP) VARIETIES FOR THEIR REACTIONS TO STEM ROT IN NORTH - WEST NIGERIA

A DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA,IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF A MASTER OF SCIENCE DEGREE IN CROP PROTECTION.DEPARTMENT OF CROP PROTECTION,FACULTY OF AGRICULTURE,AHMADU BELLO UNIVERSITY, ZARIANIGERIA