(Ascochyta Rabiei Pass.) of Chickpea (Cicer Arietinum L.) in Ethiopia
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OCCURENCE, DISTRIBUTION AND MANAGEMENT STRATEGIES FOR ASCOCHYTA BLIGHT (ASCOCHYTA RABIEI PASS.) OF CHICKPEA (CICER ARIETINUM L.) IN ETHIOPIA MEGERSA TADESSE JIRATA MASTER OF SCIENCE (Research Methods) JOMO KENYATTA UNIVERSITY OF AGRICULTURE AND TECHNOLOGY 2016 OCCURENCE, DISTRIBUTION AND MANAGEMENT STRATEGIES FOR ASCOCHYTA BLIGHT (ASCOCHYTA RABIEI PASS.) OF CHICKPEA (CICER ARIETINUM L.) IN ETHIOPIA MEGERSA TADESSE JIRATA A dissertation submitted in partial fulfillment of the requirements of Master of Science degree in Research Methods in the Jomo Kenyatta University of Agriculture and Technology 2016 i DECLARATION This research dissertation is my original work and has not been submitted to any other University for a degree. Signature ……………………………………. Date …………………………. Jirata, Megersa Tadesse This research dissertation has been submitted with our approval as University Supervisors: Signature ………………………………………………… Date ………………………… Prof. Losenge Turoop JKUAT, Kenya Signature ………………………………………………… Date ………………………… Dr Ojiewo Chris (Senior Scientist, Legume Breeding) ICRISAT, Ethiopia ii DEDICATION This work is fervently dedicated to my Lord and Saviour, Jesus Christ and to my beloved parents Mr. Tadesse Jirata and Mrs. Dagitu Nagaya, through whose enthusiasm and inspirations have brought me this far. This work is also dedicated to my loving brother Mesgebu, my sisters Mule, Mafte, and Gadise and to all supportive hearts and minds who assisted me throughout the process of this dissertation. iii ACKNOWLEDGEMENTS I would like to take this opportunity to express my sincere appreciation to individuals who have made significant contributions towards the success of this work. First and foremost, my gratitude and praise goes to the Almighty God whose unfailing love and protection has sustained me till now. It gives me great pleasure to express my sincere thanks and deep sense of gratitude to my advisor Professor Losenge Turoop for inspiration, constant encouragement, guidance, supervision and constructive criticism in preparation of this research. I am indebted to my advisor Dr. Chris Ojiewo, Senior Scientist (Legume Breeder) for his supervision, constant encouragement, constructive suggestions and critical comments in conducting field studies and bringing out the manuscript of dissertation in final shape. I am highly thankful to him for arranging facilities as well as my comfortable stay at International Crops Research Institute for Semi-Arid Tropics (ICRISAT) and Debre Zeit Agricultural Research Center (DZARC). My sincerely acknowledgements are due to Dr Judith and Dr Nugussie, Senior Plant Pathologists for providing me their valuable encouragement, advice, guidance technical help and constructive suggestions during the period of investigation. I am thankful to Mr. Sultan Mohammed, PhD candidate for providing me valuable suggestions and constructive advice to conduct a successful survey. My gratitude also goes to Mr. Tesfaye Geleta, Assefa Funga, Dr Million Eshete and Dr Mekasha for their immense support, especially for supplying me valuable information and encouragement during the course of my research. I am also thankful to Mr. Gizachew Legesse (Research Associate, Resilient Dryland Systems) for helping me draw maps for my study. My heartfelt gratitude also goes to ICRISAT staff, Mr. Ketema, Manaye and Mrs. Tesfash for their help in conducting the survey; Mr. Irrasi Megersa, Tolasa Bedasa, and Tayu Shewasagedi for their field assistance and technical support in execution of the research. Thanks are also due to Mr. Dagnachew Bekele, Asrat Zewde, Amin Fedlu, Fasil Hailu, Shugute Shifara, Genet Mengistu, Redwan Mohammed, Lata Tufa and other staff for their research work facilitation, moral support and who assisted me in making this programme a success and gave me wonderful stay at DZARC, Bishoftu, Ethiopia. I also want to extend my appreciation and thanks to many other individuals who directly or indirectly contributed to the success of my work. iv I sincerely appreciate the prayers and invaluable support of my parents, siblings, other family members and friends, especially Sorome Lamu (my fiancée) for her continuous encouragement and moral support throughout my studies. I am highly thankful to the Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya for granting me admission for carrying out this study. My deepest acknowledgments go to the Regional University Forum for Capacity Building in Agriculture (RUFORUM) for providing me with financial assistance throughout my studies. Financial support for this project obtained from the International Crops Research Institute for Semi-Arid Tropics (ICRISAT) is greatly appreciated. v TABLE OF CONTENTS DECLARATION........................................................................................................................... ii DEDICATION.............................................................................................................................. iii ACKNOWLEDGEMENTS ........................................................................................................ iv LISTS OF TABLES ..................................................................................................................... ix LISTS OF FIGURE ...................................................................................................................... x ACRONYMS AND ABBREVIATIONS .................................................................................... xi ABSTRACT ................................................................................................................................. xii CHAPTER ONE ........................................................................................................................... 1 INTRODUCTION......................................................................................................................... 1 1.1 Background to the study ....................................................................................................... 1 1.2 Statement of the Problem ..................................................................................................... 3 1.3 Research Objectives ............................................................................................................. 4 1.3.1 General Objective ........................................................................................................... 4 1.3.2 Specific Objectives ......................................................................................................... 4 1.4 Research Questions ............................................................................................................. 5 1.5 Justification of the Study ..................................................................................................... 5 1.6 Scope of the Study............................................................................................................... 6 CHAPTER TWO .......................................................................................................................... 7 LITERATURE REVIEW ............................................................................................................ 7 2.1 Chickpea Production Worldwide ......................................................................................... 7 2.2 Chickpea Production in sub-Saharan Africa ........................................................................ 7 2.3 Chickpea Production in Ethiopia ......................................................................................... 8 2.4 Major Constraints to Chickpea Production ......................................................................... 8 2.4.1 Cause of the Disease ....................................................................................................... 9 vi 2.4.2 Disease Symptoms ......................................................................................................... 9 2.4.3 Distribution and Spread of the Disease ......................................................................... 9 2.4.4 Disease Management ................................................................................................... 10 CHAPTER THREE .................................................................................................................... 15 DETERMINATION OF ASCOCHYTA BLIGHT DISEASE OCCURENCE AND DISTRIBUTION IN MAJOR CHICKPEA PRODUCTION REGIONS OF ETHIOPIA .. 15 3.1 Abstract ............................................................................................................................. 15 3.2 Introduction ....................................................................................................................... 16 3.3 Materials and Methods ....................................................................................................... 17 3.3.1 Field Observations ........................................................................................................ 17 3.3.2 Selection of Survey Area ............................................................................................. 17 3.3.3 Sampling Methods ....................................................................................................... 17 3.3.4 Geographical Data Collection .................................................................................... 19 3.3.5 Determination of Disease Parameters ......................................................................... 20 3.3.6