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  1. 1. Eliminating Rhyzopertha dominica by Thai Herbs <ul><li>Member </li></ul><ul><li>Miss Thanatcha Boonachathong M.6/3 No.4 </li></ul><ul><li>Miss Napassawan Kanskulthon M.6/3 No.5 </li></ul><ul><li>Miss Prapatsorn Lertluechachai M.6/3 No.6 </li></ul>
  2. 2. Methods
  3. 3. Methods <ul><li>Step 1 Preparing the Experiment </li></ul><ul><li>Step 2 Preparing the Extract </li></ul><ul><li>Step 3 Testing the Efficiency of the Extract </li></ul>
  4. 4. <ul><li>Step 1 Preparing the Experiment </li></ul>Methods Prepare Thai herbs (Lemon grass and Kaffir Lime) and clean them well.
  5. 5. Methods Chop Thai herbs in to a small size Prepare weevils ( Rhyzopertha dominica )
  6. 6. <ul><li>Step 2 Preparing the Extract </li></ul>Methods Extract the essential oil from Thai herbs by steam distillation. Separate the oil and water by using separatory funnel
  7. 7. Methods Keep the oil (the extract) in a bottle and put it in a refrigerator.
  8. 8. <ul><li>Step 3 Testing the Efficiency of the Extract </li></ul>Methods Fill paddy in six plates (15 gram per each plate) Then fill ten weevils in to each plate.
  9. 9. Methods Dilute the essential oil to 5 concentrations : 10% 20% 30% 40% 50% Spray the solutions in to the plates that we prepared Distilled water were used as a control.
  10. 10. Methods Dead weevil in each plate were counted every 15 minutes. Keep the number of it. Each treatment w as replicated three times before changing the herbs

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