Impact of two accidentally introduced Encarsia species (Hymenoptera: Aphelinidae) and other biotic and abiotic factors on the spiralling whitefly Aleurodicus dispersus (Russell) (Homoptera: Aleyrodidae) in Benin, West Africa
In early 1993, the spiralling whitefly, Aleurodicus dispersus (Russell), was observed in Benin for the first time, inflicting damage to ornamental and shade trees and cassava. The parasitoids Encarsia ?haitiensis Dozier and E. guadeloupae Viggiani were observed in the second half of 1993. They were...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Informa UK Limited
1998
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/95948 |
| _version_ | 1855523615998476288 |
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| author | D'Almeida, Y.A. Lys, J.A. Neuenschwander, Peter Ajuonu, O. |
| author_browse | Ajuonu, O. D'Almeida, Y.A. Lys, J.A. Neuenschwander, Peter |
| author_facet | D'Almeida, Y.A. Lys, J.A. Neuenschwander, Peter Ajuonu, O. |
| author_sort | D'Almeida, Y.A. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | In early 1993, the spiralling whitefly, Aleurodicus dispersus (Russell), was observed in Benin for the first time, inflicting damage to ornamental and shade trees and cassava. The parasitoids Encarsia ?haitiensis Dozier and E. guadeloupae Viggiani were observed in the second half of 1993. They were known to have the same host in the Pacific region, and were thought to have been introduced accidentally. The impact of these parasitoids was quantified using four surveys from 1993 to 1995 (on 2541 trees in 537 localities) and by population studies on guava. In 1993, A. dispersus occurred mostly in towns in the southern part of Benin; penetration into farmland was observed later. E. ?haitiensis was more abundant and widespread than E. guadeloupae , and by 1995 it had been recovered from most (84%) of the infested localities. On guava trees, the annual peaks of A. dispersus population declined by ca. 80% between 1993 and 1996. During the same period parasitism rates increased. Econometric multiple regression analyses based on 996 infested trees demonstrated that A. dispersus population densities, the proportion of infested trees and damage scores all declined significantly with increasing duration of the presence of the parasitoids, indicating their impact. Other variables were also significantly related to A. dispersus levels. |
| format | Journal Article |
| id | CGSpace95948 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1998 |
| publishDateRange | 1998 |
| publishDateSort | 1998 |
| publisher | Informa UK Limited |
| publisherStr | Informa UK Limited |
| record_format | dspace |
| spelling | CGSpace959482024-08-27T10:35:46Z Impact of two accidentally introduced Encarsia species (Hymenoptera: Aphelinidae) and other biotic and abiotic factors on the spiralling whitefly Aleurodicus dispersus (Russell) (Homoptera: Aleyrodidae) in Benin, West Africa D'Almeida, Y.A. Lys, J.A. Neuenschwander, Peter Ajuonu, O. biological control encarsia aphelinidae spiralling whitefly aleurodicus dispersus aleyrodidae In early 1993, the spiralling whitefly, Aleurodicus dispersus (Russell), was observed in Benin for the first time, inflicting damage to ornamental and shade trees and cassava. The parasitoids Encarsia ?haitiensis Dozier and E. guadeloupae Viggiani were observed in the second half of 1993. They were known to have the same host in the Pacific region, and were thought to have been introduced accidentally. The impact of these parasitoids was quantified using four surveys from 1993 to 1995 (on 2541 trees in 537 localities) and by population studies on guava. In 1993, A. dispersus occurred mostly in towns in the southern part of Benin; penetration into farmland was observed later. E. ?haitiensis was more abundant and widespread than E. guadeloupae , and by 1995 it had been recovered from most (84%) of the infested localities. On guava trees, the annual peaks of A. dispersus population declined by ca. 80% between 1993 and 1996. During the same period parasitism rates increased. Econometric multiple regression analyses based on 996 infested trees demonstrated that A. dispersus population densities, the proportion of infested trees and damage scores all declined significantly with increasing duration of the presence of the parasitoids, indicating their impact. Other variables were also significantly related to A. dispersus levels. 1998-03 2018-07-05T06:30:17Z 2018-07-05T06:30:17Z Journal Article https://hdl.handle.net/10568/95948 en Limited Access Informa UK Limited D'Almeida, Y.A., Lys, J.A., Neuenschwander, P. & Ajuonu, O. (1998). Impact of two accidentally introduced Encarsia species (Hymenoptera: Aphelinidae) and other biotic and abiotic factors on the spiralling whitefly Aleurodicus dispersus (Russell)(Homoptera: Aleyrodidae), in Benin, West Africa. Biocontrol Science and Technology, 8(1), 163-173. |
| spellingShingle | biological control encarsia aphelinidae spiralling whitefly aleurodicus dispersus aleyrodidae D'Almeida, Y.A. Lys, J.A. Neuenschwander, Peter Ajuonu, O. Impact of two accidentally introduced Encarsia species (Hymenoptera: Aphelinidae) and other biotic and abiotic factors on the spiralling whitefly Aleurodicus dispersus (Russell) (Homoptera: Aleyrodidae) in Benin, West Africa |
| title | Impact of two accidentally introduced Encarsia species (Hymenoptera: Aphelinidae) and other biotic and abiotic factors on the spiralling whitefly Aleurodicus dispersus (Russell) (Homoptera: Aleyrodidae) in Benin, West Africa |
| title_full | Impact of two accidentally introduced Encarsia species (Hymenoptera: Aphelinidae) and other biotic and abiotic factors on the spiralling whitefly Aleurodicus dispersus (Russell) (Homoptera: Aleyrodidae) in Benin, West Africa |
| title_fullStr | Impact of two accidentally introduced Encarsia species (Hymenoptera: Aphelinidae) and other biotic and abiotic factors on the spiralling whitefly Aleurodicus dispersus (Russell) (Homoptera: Aleyrodidae) in Benin, West Africa |
| title_full_unstemmed | Impact of two accidentally introduced Encarsia species (Hymenoptera: Aphelinidae) and other biotic and abiotic factors on the spiralling whitefly Aleurodicus dispersus (Russell) (Homoptera: Aleyrodidae) in Benin, West Africa |
| title_short | Impact of two accidentally introduced Encarsia species (Hymenoptera: Aphelinidae) and other biotic and abiotic factors on the spiralling whitefly Aleurodicus dispersus (Russell) (Homoptera: Aleyrodidae) in Benin, West Africa |
| title_sort | impact of two accidentally introduced encarsia species hymenoptera aphelinidae and other biotic and abiotic factors on the spiralling whitefly aleurodicus dispersus russell homoptera aleyrodidae in benin west africa |
| topic | biological control encarsia aphelinidae spiralling whitefly aleurodicus dispersus aleyrodidae |
| url | https://hdl.handle.net/10568/95948 |
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