Preliminary study of resistance in 4 populations of Helopeltis theobromae Miller (Hemiptera: Miridae) to γ − HCH, Propoxur and Dioxacarb.
Four populations of Helopeltis theobromae Miller were investigated in Peninsular Malaysia for the existence of resistance to alpha-HCH, propoxur and dioxacarb by means of time-response assays. The insects were confined on treated filter paper and time to knockdown was recorded to establish lethal ex...
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| Format: | Conference or Workshop Item |
| Language: | English |
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| Online Access: | http://psasir.upm.edu.my/id/eprint/19349/ http://psasir.upm.edu.my/id/eprint/19349/1/ID%2019349.pdf |
| _version_ | 1848843703017275392 |
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| author | Omar, Dzolkhifli Khoo, Khay Chong Muhamad, Rita |
| author_facet | Omar, Dzolkhifli Khoo, Khay Chong Muhamad, Rita |
| author_sort | Omar, Dzolkhifli |
| building | UPM Institutional Repository |
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| description | Four populations of Helopeltis theobromae Miller were investigated in Peninsular Malaysia for the existence of resistance to alpha-HCH, propoxur and dioxacarb by means of time-response assays. The insects were confined on treated filter paper and time to knockdown was recorded to establish lethal exposure time (LT50) and percentage survival. The order of sensitivity of different populations to alpha-HCH was Serdang Bagan Datoh Teluk Intan Intan = Kajang; and to dioxacarb, Serdang Kajang was consistently most sensitive or susceptible to all three insecticides. The Kajang population the only one showing tolerance or resistance, having an LT50 value three times higher than the Serdang population; the survival after 4 hr continuous exposure was 36% for the former and nil for the latter. The existence of differential sensitivity to each of the three insecticides between the four populations indicated an impending resistance problem. |
| first_indexed | 2025-11-15T08:19:14Z |
| format | Conference or Workshop Item |
| id | upm-19349 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T08:19:14Z |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-193492015-05-14T06:56:36Z http://psasir.upm.edu.my/id/eprint/19349/ Preliminary study of resistance in 4 populations of Helopeltis theobromae Miller (Hemiptera: Miridae) to γ − HCH, Propoxur and Dioxacarb. Omar, Dzolkhifli Khoo, Khay Chong Muhamad, Rita Four populations of Helopeltis theobromae Miller were investigated in Peninsular Malaysia for the existence of resistance to alpha-HCH, propoxur and dioxacarb by means of time-response assays. The insects were confined on treated filter paper and time to knockdown was recorded to establish lethal exposure time (LT50) and percentage survival. The order of sensitivity of different populations to alpha-HCH was Serdang Bagan Datoh Teluk Intan Intan = Kajang; and to dioxacarb, Serdang Kajang was consistently most sensitive or susceptible to all three insecticides. The Kajang population the only one showing tolerance or resistance, having an LT50 value three times higher than the Serdang population; the survival after 4 hr continuous exposure was 36% for the former and nil for the latter. The existence of differential sensitivity to each of the three insecticides between the four populations indicated an impending resistance problem. Conference or Workshop Item NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/19349/1/ID%2019349.pdf Omar, Dzolkhifli and Khoo, Khay Chong and Muhamad, Rita Preliminary study of resistance in 4 populations of Helopeltis theobromae Miller (Hemiptera: Miridae) to γ − HCH, Propoxur and Dioxacarb. In: Proceedings of the International Conference on Cocoa and Coconuts: Progress and Outlook, 15-17 Oct. 1984, Kuala Lumpur, Malaysia. . Cocoa - Malaysia Cocoa - Diseases and pests |
| spellingShingle | Cocoa - Malaysia Cocoa - Diseases and pests Omar, Dzolkhifli Khoo, Khay Chong Muhamad, Rita Preliminary study of resistance in 4 populations of Helopeltis theobromae Miller (Hemiptera: Miridae) to γ − HCH, Propoxur and Dioxacarb. |
| title | Preliminary study of resistance in 4 populations of Helopeltis theobromae Miller (Hemiptera: Miridae) to γ − HCH, Propoxur and Dioxacarb. |
| title_full | Preliminary study of resistance in 4 populations of Helopeltis theobromae Miller (Hemiptera: Miridae) to γ − HCH, Propoxur and Dioxacarb. |
| title_fullStr | Preliminary study of resistance in 4 populations of Helopeltis theobromae Miller (Hemiptera: Miridae) to γ − HCH, Propoxur and Dioxacarb. |
| title_full_unstemmed | Preliminary study of resistance in 4 populations of Helopeltis theobromae Miller (Hemiptera: Miridae) to γ − HCH, Propoxur and Dioxacarb. |
| title_short | Preliminary study of resistance in 4 populations of Helopeltis theobromae Miller (Hemiptera: Miridae) to γ − HCH, Propoxur and Dioxacarb. |
| title_sort | preliminary study of resistance in 4 populations of helopeltis theobromae miller (hemiptera: miridae) to γ − hch, propoxur and dioxacarb. |
| topic | Cocoa - Malaysia Cocoa - Diseases and pests |
| url | http://psasir.upm.edu.my/id/eprint/19349/ http://psasir.upm.edu.my/id/eprint/19349/1/ID%2019349.pdf |