Muhammad Rafiq Shahid Ento
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STUDIES ON MECHANISMS OF RESISTANCE IN DIFFERENT HOST PLANTS AGAINST COTTON MEALYBUG, PHENACOCCUS SOLENOPSIS TINSLEY (HEMIPTERA: PSEUDOCOCCIDAE) By MUHAMMAD RAFIQ SHAHID Reg. No. 2000-ag-1364 M.Sc. (Hons.) Agri. Entomology A thesis submitted in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY IN ENTOMOLOGY DEPARTMENT OF ENTOMOLOGY FACULTY OF AGRICULTURE UNIVERSITY OF AGRICULTURE, FAISALABAD (PAKISTAN) 2015 i i To, The Controller of Examinations, University of Agriculture, Faisalabad. We, the Supervisory Committee, certify that the contents and form of thesis submitted by Mr. Muhammad Rafiq Shahid, Regd. No. 2000-ag-1364 have been found satisfactory and recommend that it be processed for evaluation by the external examiner(s) for the award of Ph. D degree. SUPERVISORY COMMITTEE: CHAIRMAN: (Prof. Dr. Muhammad Jalal Arif) MEMBER: (Dr. Muhammad Dildar Gogi) MEMBER: (Prof. Dr. Nazir Javed) ii In the name of ALLAH The Most Beneficent The Most Merciful This Humble Effort is Dedicated to HOLY PROPHET HAZART MUHAMMAD (Peace Be Upon Him) The Ocean of Knowledge and The greatest reformer, My Beloved PARENTS BROTHERS, SISTERS AND MY WIFE Their hands always rose in prayer for me and are forever with me to feel the bud of their wishes and prayers, Blooming into a flower. iii DECLARATION I hereby declare that the contents of the thesis” Studies on mechanisms of resistance in different host plants against cotton mealybug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) are product of my own research and no part has been copied from any published source (except the references, standard mathematic or genetic models/equations/protocoals etc.). I further declare that same work has not been submitted for award of any other diploma/degree. The University may take action if the information provided is found inaccurate at any stage (in case of any default the scholar will be proceeded as against as per HEC plagiarism policy). MUHAMMAD RAFIQ SHAHID (2000-ag-1364) iv ACKNOWLEDGMENT First of all I would like to bow my head before “ALMIGHTY ALLAH” the Gracious, the Merciful, the Beneficial Who presented me in a Muslim community and also bestowed and blessed me with such a lucid intelligence as I could endeavor my services towards this manuscript. Countless salutations are upon the HOLY PROPHET MOHAMMAD (Peace Be Upon Him), the fountains of knowledge, who has guided his “Ummah” to seek knowledge from cradle to grave. This work was made possible by a mealybug Project funded from the Higher Education Commission of Pakistan. I had served as senior Research Associate in that project. I am extremely delighted to convey my deepest sense of gratitude to Principal investigator of the project and my supervisor, Dr. Muhammad Jalal Arif, Professor and Chairman at Department of Entomology, University of Agriculture, Faisalabad (UAF) for his masterly pieces of advice, inspiring attitude, kind cooperation, dexterous guidance, constructive criticism and valuable suggestions in the completion of this research work and compilation of thesis treatise. I am also obliged and pledged for all the enthuastic and sincre efforts of Prof. Dr. Muhammad Jalal Arif extended for the provision of required inputs, personnels and scholarly reasoning from experimental layout to writeup of thesis. I am also highly obliged to supervisory Committee especially Dr. Muhammad Dildar Gogi, (Assistant Professor) for his technical and moral guidance and suggestions throughout my study period. I also extend my sincere thanks to Dr. Nazir Javed, for his cooperation in completion of this manuscript. I am thankful to Dr. Yasin Ashraf, Principal Scientific Officer at NIAB and Mr. Allah Nawaz, ARO at Ayub Research Institute, they both helped me in plant analysis. I also oblige the expertise of Dr. Muhammad Sufian (Assistant Professor, Entomology, Ph. D Germany), Dr. Fatima Mustafa, Dr. Ahmad Nawaz and Dr. Kashif Riaz (Plant Pathology, UAF) for reviewing my thesis. The moral support of my mother and father Mr. Allah Ditta (Rtd. Senior Head Master High School) is also acknowledged who always appreciated and prayed for my success. I am also thankful to my wife Memoona Aziz, my children Muhammad Osaid Shahid and Muhammad Ashhad Malik, my other blood related members Muhammad Zahid, Dr. Amir Shafiq, Saif Ullah, Sanwal and Awais who had to suffer the absence of the care and affection they deserved during my absence from home. MUHAMMAD RAFIQ SHAHID v CONTENTS CHAPTER NO. TITLE PAGE 1 INTRODUCTION 1 2 REVIEW OF LITERATURE 6 3 OBJECTIVE -1 20 4 OBJECTIVE -2(a,b) 40,67 5 OBJECTIVE -3 101 6 OBJECTIVE -4 158 vi TABLE OF CONTENTS CH. # TITLE Page No. DECLARATION iv ACKNOWLEDGEMENT v LIST OF FIGURES xi LIST OF TABLES xviii ABSTRACT xx SUMMARY xxi 1 Chapter 1: INTRODUCTION 1 2 Chapter 2: REVIEW OF LITERATURE 2.1 Economic importance of Phenacoccus solenopsis 6 2.2 Geographical distribution of P. solenopsis 6 2.3 Population dynamics of P. solenopsis 6 2.4 Polyphagous feeding and invasive nature 7 2.5 Nature of damage of P. solenopsis 8 2.6 Life history parameters 8 2.7 Host plants of mealybug in Pakistan 8 Drawbacks of chemical control for the management of P. 2.8 9 solenopsis 2.9 Importance of host plant resistance 9 2.10 Mechanisms of resistance 10 2.11 Antixenosis mechanism 12 2.12 Antibiosis mechanism 13 2.13 Tolerance mechanism 16 2.14 Effect of plant resistance on P. solenopsis 17 3 CHAPTER 3 20 Determination of natural incidence of P. solenopsis on different 3.1 host plants under cotton and central mixed zone of Punjab, 20 Pakistan Percentage infestation of cotton mealybug on the tested host 3.2 25 plants 3.3 Population of cotton mealybug on the tested host plants 26 Instar wise proportion of mealybug among selected plant 3.4 27 species Categorizing cultivated host plants of cotton mealybug into 3.5 30 incidental and susceptible hosts Categorizing uncultivated host plants of mealybug into 3.6 30 incidental and susceptible hosts District wise infestation and population of mealybug on 3.7 31 different plant species Infestation of cotton mealybug on the tested host plants in 3.8 31 selected districts 3.9 Population of cotton mealybug on the tested host plants 32 Seasonal population dynamics of mealybug on selected plant 3.10 33 species 3.11 Cluster analysis among plant species on the basis of mealybug 36 vii population and infestation 3.12 Principal component analysis 37 4 CHAPTER 4 40 Assessment of antixenosis mechanisms of resistance in 4.1 40 different plant species for P. solenopsis Physico-morphic based antixenosis mechanism of resistance in 4.1.1 40 selected host plants for P. solenopsis 4.1.2 Colony culture of cotton mealybug 42 4.1.3 Plant material 42 Determination of attractiveness index of different instars of P. 4.1.4 42 solenopsis 4.1.5 Determining physic-morphic traits of selected plant species 44 4.1.6 Thickness of leaf lamina (µm) 44 4.1.7 Leaf area (cm2) 45 4.1.8 Trichome density and trichome length (µm) 45 Attractive index of first instar of P. solenopsis for different 4.1.9 46 plant species at 2, 4 and 8 hours post-release intervals Attractive index of second instar of P. solenopsis for different 4.1.10 48 plant species at 2, 4 and 8 hours post-release intervals Attractive index of third instar of P. solenopsis for different 4.1.11 50 plant species at 2, 4 and 8 hours post-release intervals 4.1.12 Morphological plant Characters 53 Trichome density and its association with attractiveness index 4.1.13 53 of P. solenopsis Trichome length in tested plant species and its association with 4.1.14 56 attractiveness index of mealybug Leaf area of tested plant species and its association with 4.1.15 59 attractiveness of mealybug Leaf thickness of selected plant species and its association with 4.1.16 61 attractiveness index of mealybug 4.1.17 Cluster analysis among studied traits 63 4.1.18 Principal component analysis 66 Biochemical based antixenosis mechanism of resistance in 4.2 67 different host plants against cotton mealybug Determination of Biochemical factors/ Antibiotic factors in 4.2.1 69 leaves of selected plant species Biochemical leaf traits of host plants, attractiveness index of P. 4.2.2 75 solenopsis and their nature of association Phosphorus contents and its association with attractiveness 4.2.3 75 index of P. solenopsis Potassium contents and its association with attractiveness index 4.2.4 78 of P. solenopsis Nitrogen contents and its association with attractiveness index 4.2.5 80 of P. Sodium contents and its association with attractiveness index of 4.2.6 82 P. solenopsis Total soluble sugar percentage and its association with 4.2.7 85 attractiveness index of P. solenopsis 4.2.8 Reducing sugar percentage and its association with 87 viii attractiveness index of P. solenopsis Crude protein contents and its association with attractiveness 4.2.9 89 index of P. solenopsis Chlorophyll concentration percentage and its association with 4.2.10 91 attractiveness index of P. solenopsis 4.2.11 Cluster analysis among studied traits 93 4.2.12 Principal component analysis 94 5 CHAPTER 5 101 Determination of antibiosis mechanism of resistance in selected 5.1 101 plant species for P. solenopsis 5.1.1 Plant species 103 5.1.2 Maintenance of mealybug colony 103 5.1.3 Experimental layout for determining the antibiosis mechanism 103 of resistance in different host plants 5.1.4 Determining Biochemical traits of selected plants 104 5.2 Effect of plant species on life parameters of P. solenopsis 105 Effect of plant species on the longevity of 1st, 2nd and 3rd instar 5.2.1 105 nymphs of P.