Colonization of two tropical forage grasses by Acromyrmex landolti (Hymenoptera: Formicidae) in Eastern Colombia
Established swards of the tropical forage grass Andropogon gayanus var. bis-quamulatus (Hochst.) Hack were heavily colonized by the leaf-cutter Acromyrmex landolti Forel over a period of 33 months in the eastern plains of Colombia. Density of Ac. landolti colonies in swards of A. gayanus increased f...
| Autores principales: | , , |
|---|---|
| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
1993
|
| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/43271 |
| _version_ | 1855513691758264320 |
|---|---|
| author | Lapointe, Stephen L. Serrano, M.S. Villegas, A |
| author_browse | Lapointe, Stephen L. Serrano, M.S. Villegas, A |
| author_facet | Lapointe, Stephen L. Serrano, M.S. Villegas, A |
| author_sort | Lapointe, Stephen L. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Established swards of the tropical forage grass Andropogon gayanus var. bis-quamulatus (Hochst.) Hack were heavily colonized by the leaf-cutter Acromyrmex landolti Forel over a period of 33 months in the eastern plains of Colombia. Density of Ac. landolti colonies in swards of A. gayanus increased from 23 @+ 9 at planting in 1988 to 263 @+ 57 colonies per 1800 m@^2 in 1991. Brachiaria humidicola (Rendle) Schweick was highly resistant to colonization by Ac. landolti. Colony density in swards of B. humidicola declined from 23 @+ 9 at planting in 1988 to 16 @+ 4 colonies per 1800 m@^2 in 1991. Mean density in adjacent savanna control plots varied over the three years from 114 @+ 23 to 225 @+ 24 colonies per 1800 m^2. Maps of colony entrances within swards were made yearly during 1989, 1990, and 1991. Comparison of maps demonstrated that colonies did not persist more than a single year at a given site implying colony migration. Excavation of over 100 colonies of Ac. landolti revealed a single entrance per colony in all cases. |
| format | Journal Article |
| id | CGSpace43271 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1993 |
| publishDateRange | 1993 |
| publishDateSort | 1993 |
| record_format | dspace |
| spelling | CGSpace432712023-02-15T05:10:17Z Colonization of two tropical forage grasses by Acromyrmex landolti (Hymenoptera: Formicidae) in Eastern Colombia Lapointe, Stephen L. Serrano, M.S. Villegas, A feed crops andropogon gayanus brachiaria humidicola pest insects acromyrmex insectos dañinos Established swards of the tropical forage grass Andropogon gayanus var. bis-quamulatus (Hochst.) Hack were heavily colonized by the leaf-cutter Acromyrmex landolti Forel over a period of 33 months in the eastern plains of Colombia. Density of Ac. landolti colonies in swards of A. gayanus increased from 23 @+ 9 at planting in 1988 to 263 @+ 57 colonies per 1800 m@^2 in 1991. Brachiaria humidicola (Rendle) Schweick was highly resistant to colonization by Ac. landolti. Colony density in swards of B. humidicola declined from 23 @+ 9 at planting in 1988 to 16 @+ 4 colonies per 1800 m@^2 in 1991. Mean density in adjacent savanna control plots varied over the three years from 114 @+ 23 to 225 @+ 24 colonies per 1800 m^2. Maps of colony entrances within swards were made yearly during 1989, 1990, and 1991. Comparison of maps demonstrated that colonies did not persist more than a single year at a given site implying colony migration. Excavation of over 100 colonies of Ac. landolti revealed a single entrance per colony in all cases. 1993 2014-09-24T08:41:53Z 2014-09-24T08:41:53Z Journal Article https://hdl.handle.net/10568/43271 en Open Access |
| spellingShingle | feed crops andropogon gayanus brachiaria humidicola pest insects acromyrmex insectos dañinos Lapointe, Stephen L. Serrano, M.S. Villegas, A Colonization of two tropical forage grasses by Acromyrmex landolti (Hymenoptera: Formicidae) in Eastern Colombia |
| title | Colonization of two tropical forage grasses by Acromyrmex landolti (Hymenoptera: Formicidae) in Eastern Colombia |
| title_full | Colonization of two tropical forage grasses by Acromyrmex landolti (Hymenoptera: Formicidae) in Eastern Colombia |
| title_fullStr | Colonization of two tropical forage grasses by Acromyrmex landolti (Hymenoptera: Formicidae) in Eastern Colombia |
| title_full_unstemmed | Colonization of two tropical forage grasses by Acromyrmex landolti (Hymenoptera: Formicidae) in Eastern Colombia |
| title_short | Colonization of two tropical forage grasses by Acromyrmex landolti (Hymenoptera: Formicidae) in Eastern Colombia |
| title_sort | colonization of two tropical forage grasses by acromyrmex landolti hymenoptera formicidae in eastern colombia |
| topic | feed crops andropogon gayanus brachiaria humidicola pest insects acromyrmex insectos dañinos |
| url | https://hdl.handle.net/10568/43271 |
| work_keys_str_mv | AT lapointestephenl colonizationoftwotropicalforagegrassesbyacromyrmexlandoltihymenopteraformicidaeineasterncolombia AT serranoms colonizationoftwotropicalforagegrassesbyacromyrmexlandoltihymenopteraformicidaeineasterncolombia AT villegasa colonizationoftwotropicalforagegrassesbyacromyrmexlandoltihymenopteraformicidaeineasterncolombia |