TY - JOUR
T1 - The effect of colony isolation of the predacious ant, oecophylla smaragdina (f.) (hymenoptera: Formicidae), on protection of cashew plantations from insect pests
AU - Peng, R.K.
AU - Christian, K.
AU - Gibb, K.
PY - 1999/1/1
Y1 - 1999/1/1
N2 - Fierce boundary fights between Oecophylla smaragdina colonies were previously identified as the major factor limiting ant populations and the efficiency of ants as biological control agents. In order to determine the feasibility and effect ofpreventing boundary fights between colonies, experiments with full-, semi- and no-isolation of existing antcolonies in cashew plantations were done in 1996 and 1997. In a related experiment, ant colonies were transplanted from native vegetation to a cashew orchard. Trees with ant colonies which were fully isolated from other colonies were significantly less damaged by the main insect pests and produced significantly higher yield than those with ant colonies which were partly isolated or were not isolated. That was because fighting events between fully isolated ant colonies were eliminated, and the populations of these colonies were high throughout the cashew flowering and fruiting period. Trees in which O. smaragdina colonies were transplanted suffered little damage by the main insect pests and produced high quality nuts and panicles. However, trees which were protected by pesticides produced lower quality nuts and panicles, because these trees suffered damage by the tea mosquito bug, Helopeltis pernicialis, and the mango tip borer, Penicillaria jocosatrix. It is suggested that O. smaragdina colony isolation, combined with ant transplantation, is an effective means both to achieve high ant populations in cashew plantations and to obtain a high yield.
AB - Fierce boundary fights between Oecophylla smaragdina colonies were previously identified as the major factor limiting ant populations and the efficiency of ants as biological control agents. In order to determine the feasibility and effect ofpreventing boundary fights between colonies, experiments with full-, semi- and no-isolation of existing antcolonies in cashew plantations were done in 1996 and 1997. In a related experiment, ant colonies were transplanted from native vegetation to a cashew orchard. Trees with ant colonies which were fully isolated from other colonies were significantly less damaged by the main insect pests and produced significantly higher yield than those with ant colonies which were partly isolated or were not isolated. That was because fighting events between fully isolated ant colonies were eliminated, and the populations of these colonies were high throughout the cashew flowering and fruiting period. Trees in which O. smaragdina colonies were transplanted suffered little damage by the main insect pests and produced high quality nuts and panicles. However, trees which were protected by pesticides produced lower quality nuts and panicles, because these trees suffered damage by the tea mosquito bug, Helopeltis pernicialis, and the mango tip borer, Penicillaria jocosatrix. It is suggested that O. smaragdina colony isolation, combined with ant transplantation, is an effective means both to achieve high ant populations in cashew plantations and to obtain a high yield.
KW - ant
KW - management practice
KW - plantation
KW - potential biocontrol agent, Formicidae
KW - Helopeltis pernicialis
KW - Heteroptera
KW - Hymenoptera
KW - Lepidoptera
KW - Miridae
KW - Noctuidae
KW - Oecophylla smaragdina
KW - Penicillaria jocosatrix
UR - http://www.scopus.com/inward/record.url?scp=0032730057&partnerID=8YFLogxK
U2 - 10.1080/096708799227789
DO - 10.1080/096708799227789
M3 - Article
SN - 0967-0874
VL - 45
SP - 189
EP - 194
JO - International Journal of Pest Management
JF - International Journal of Pest Management
IS - 3
ER -