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 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.
Main Authors: | , , |
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Format: | Journal Article biblioteca |
Language: | English |
Published: |
1993
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Subjects: | feed crops, andropogon gayanus, brachiaria humidicola, pest insects, acromyrmex, insectos dañinos, |
Online Access: | https://hdl.handle.net/10568/43271 http://journals.fcla.edu/flaent/article/view/58953/56632 |
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dig-cgspace-10568-432712023-02-15T05:10:17Z 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 1938-5102 https://hdl.handle.net/10568/43271 http://journals.fcla.edu/flaent/article/view/58953/56632 en Open Access Florida Entomologist |
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feed crops andropogon gayanus brachiaria humidicola pest insects acromyrmex insectos dañinos feed crops andropogon gayanus brachiaria humidicola pest insects acromyrmex insectos dañinos |
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feed crops andropogon gayanus brachiaria humidicola pest insects acromyrmex insectos dañinos 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 |
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 |
topic_facet |
feed crops andropogon gayanus brachiaria humidicola pest insects acromyrmex insectos dañinos |
author |
Lapointe, Stephen L. Serrano, M.S. Villegas, A |
author_facet |
Lapointe, Stephen L. Serrano, M.S. Villegas, A |
author_sort |
Lapointe, Stephen L. |
title |
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_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_sort |
colonization of two tropical forage grasses by acromyrmex landolti (hymenoptera: formicidae) in eastern colombia |
publishDate |
1993 |
url |
https://hdl.handle.net/10568/43271 http://journals.fcla.edu/flaent/article/view/58953/56632 |
work_keys_str_mv |
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1779048893851369472 |