| 摘要 |
1. In a trapping device for insects which feed on mammalian blood, and which comprises a chemical attractant for the insects, the improvement which comprises including in the device a physical attractant consisting of a heated dark panel, together with a trapping arrangement effective in trapping mosquitoes attracted to said panel. 2. A device according to claim 1, wherein said chemical attractant includes carbon dioxide. 3. A device according to claim 2, comprising a combination of said dark panel; a source of said carbon dioxide for emitting the same in the vicinity of said panel, a heating source effective to heat said panel, and said trapping arrangement. 4. A device according to claim 3, further characterized by at least one of the following features: (a) said insects are mosquitoes; (b) said trapping arrangement comprises an adhesive, preferably applied onto said panel; (c) said panel is heated to a temperature of within the range of about 30 to 45 degree C; (d) said source of carbon diode is a fermentation process involving the action of microorganisms, preferably comprising yeast, on a fermentable substrate in aqueous medium. 5. A device according to claim 4, wherein at least feature (d) applies, said microorganisms comprise yeast, and said substrate comprises sugar. 6. A device according to claim 5, wherein said fermentation process is effected in presence of peptone. 7. A device according to claim 1, wherein said chemical attractant comprises at least one member selected from the group consisting of fermenting yeast, yeast extract, peptone, acetone, lactic acid and carbon dioxide, and preferably at least one of the following features applies: (a) said insects are mosquitoes; (b) said trapping arrangement comprises an adhesive, preferably applied onto said panel; (c) said panel is heated to a temperature of within the range of about 30 to 45 degree C. 8. In a method for trapping insects which feed on mammalian blood, and which comprises use of a chemical attractant for the insects the improvement which comprises use additionally of a physical attractant consisting of a heated dark panel, together with a trapping arrangement effective in trapping mosquitoes attracted to said panel. 9. A method according to claim 8, wherein said chemical attractant includes carbon dioxide. 10. A method according to Claim 9, further characterized by at least one of the following features: (a) said insects are mosquitoes; (b) said trapping arrangement comprises an adhesive, preferably applied onto said panel; (c) said panel is heated to a temperature of within the range of about 30 to 45 degree C; (d) said source of carbon dioxide is a fermentation process involving the action of microorganisms, preferably comprising yeast, on a fermentable substrate in aqueous medium. 11. A method according to claim 10, wherein at least feature (d) applies, said microorganisms comprise yeast, and said substrate comprises sugar. 12. A method according to claim 11, wherein said fermentation process is effected in presence of peptone. 13. A method according to claim 8, wherein said chemical attractant comprises at least one member selected from the group consisting of fermenting yeast, yeast extract, peptone, acetone, lactic acid and carbon dioxide and preferably at least one of the following features applies: (a) said insects are mosquitoes; (b) said trapping arrangement comprises an adhesive, preferably applied onto said panel; (c) said panel is heated to a temperature of within the range of about 30 to 45 degree C. |
