| LIST OF TABLES | 第8-9页 |
| LIST OF FIGURES | 第9-10页 |
| ACKNOWLEDGEMENTS | 第10-12页 |
| SUMMARY | 第12-16页 |
| 中文摘要 | 第17-21页 |
| CHAPTER 1 INTRODUCTION | 第21-45页 |
| 1.1 General introduction | 第21-22页 |
| 1.2 Literature review | 第22-42页 |
| 1.2.1 Plutellaxylostella L | 第22-33页 |
| 1.2.2 Curcuma longa L | 第33-36页 |
| 1.2.3 Veratrum nigrum L | 第36-38页 |
| 1.2.4 Phytolacca americana L | 第38-39页 |
| 1.2.5 Kochia scoparia (L.) Schrad | 第39-41页 |
| 1.2.6. Pseudolarix kaempferi Gord | 第41-42页 |
| 1.3 Rational and objectives | 第42-45页 |
| CHAPTER 2 SCREENING FOR INSECTICIDAL ACTIVITY OF 5 CHINESE MEDICINAL PLANTS AGAINST PLUTELLA XYLOSTELLA L. LARVAE | 第45-56页 |
| 2.1 Introduction | 第45-46页 |
| 2.2 Materials and methods | 第46-50页 |
| 2.2.1 Plant materials | 第46页 |
| 2.2.2 Insects | 第46-47页 |
| 2.2.3 Chemical reagents | 第47页 |
| 2.2.4 Plant material extraction | 第47页 |
| 2.2.5 Screening for insecticidal activity | 第47-49页 |
| 2.2.6. Determination of median lethal concentration (LC_(50)) | 第49页 |
| 2.2.7 Statistical analysis | 第49-50页 |
| 2.3 Results | 第50-53页 |
| 2.3.1 Screening for insecticidal activity | 第50页 |
| 2.3.2 Determination of median lethal concentration | 第50-53页 |
| 2.4 Discussion | 第53-56页 |
| CHAPTER 3 DETERMINATION FOR INSECTICIDAL ACTIVITY OF FRACTIONS ISOLATED FROM THE ETHYL ACETATEEXTRACT OF VERATRUMNIGRUML. ROOT AND RHIZOME AGAINST PLUTELLA XYLOSTELLA L. LARVAE | 第56-69页 |
| 3.1 Introduction | 第56-57页 |
| 3.2 Material and methods | 第57-61页 |
| 3.2.1 Chemical reagents | 第57页 |
| 3.2.2 Insects | 第57-58页 |
| 3.2.3 Extraction and isolation | 第58页 |
| 3.2.4 Screening for insecticidal activity | 第58-59页 |
| 3.2.5 Determination of median lethal concentration (LC_(50)) | 第59-60页 |
| 3.2.6 Statistical analysis | 第60-61页 |
| 3.3 Results | 第61-65页 |
| 3.3.1 Screening for insecticidal activity | 第61页 |
| 3.3.2 Leaf dipping bioassay | 第61-62页 |
| 3.3.3 Topical application | 第62-65页 |
| 3.4 Discussion | 第65-69页 |
| CHAPTER 4 ISOLATION AND IDENTIFICATION OF INSECTICIDAL ACTIVE COMPOUNDS FROM THE ETHYL ACETATE EXTRACT OF VERATRUMNIGRUML ROOT AND RHIZOME | 第69-78页 |
| 4.1 Introduction | 第69-70页 |
| 4.2 Materials and methods | 第70-72页 |
| 4.2.1 Chemical reagents | 第70页 |
| 4.2.2 Plant materials | 第70-71页 |
| 4.2.3 Isolation and purification | 第71页 |
| 4.2.4 Test for steroid | 第71-72页 |
| 4.2.5 Spectroscopic analysis | 第72页 |
| 4.3 Results | 第72-76页 |
| 4.3.1 Physical properties | 第72-73页 |
| 4.3.2 Spectroscopic analysis | 第73-76页 |
| 4.4 Discussion | 第76-78页 |
| CHAPTER 5 COMPARISON ON THE EFFICACY OF β-SITOSTEROL ISOLATED FROM THE ETHYL ACETATE EXTRACT OF VERATRUMNIGRUML. ROOT AND RHIZOME AND TWO SYNTHETIC INSECTICIDES AGAINST PLUTELLA XYLOSTELLAL | 第78-90页 |
| 5.1 Introduction | 第78-79页 |
| 5.2 Material and methods | 第79-83页 |
| 5.2.1 Insecticides | 第79-80页 |
| 5.2.2 Insects | 第80页 |
| 5.2.3 Leafdipping bioassay | 第80页 |
| 5.2.4 Topical application | 第80-81页 |
| 5.2.5 Direct dipping bioassay | 第81-82页 |
| 5.2.6 Residual bioassay | 第82页 |
| 5.2.7 Statistical analysis | 第82-83页 |
| 5.3 Results | 第83-87页 |
| 5.3.1 Leafdipping bioassay | 第83页 |
| 5.3.2 Topical application | 第83页 |
| 5.3.3 Direct dipping method | 第83-84页 |
| 5.3.4 Residual bioassay | 第84-87页 |
| 5.4 Discussion | 第87-90页 |
| CHAPTER 6 GENERAL DISCUSSION | 第90-95页 |
| 6.1 V.nigrum as new potent botanical insecticide | 第90-93页 |
| 6.2 Recommendation for further work of ecological insecticide significance | 第93-95页 |
| REFERENCES | 第95-125页 |
