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A field comparison of the modes of action of aldrin and mirex for controlling colonies of the leaf-cutting ants Atta Cephcdotes (L.) and Acromyrmex Octospinosus (Reich) (Formicidae, Attini)

Published online by Cambridge University Press:  10 July 2009

D. J. Peregrine  and
J. M. Cherrett
D. J. Peregrine
Affiliation:
Department of Applied Zoology, University College of North Wales, Bangor, Caerns, U.K.
J. M. Cherrett
Affiliation:
Department of Applied Zoology, University College of North Wales, Bangor, Caerns, U.K.
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Abstract

Two toxic baits, one containing aldrin and the other containing mirex, were compared for their effectiveness in killing field colonies of Atta cephalotes (L.) and Acromyrmex octospinosus (Reich) in Trinidad, West Indies. The fate of these two toxicants within tie nests was followed by using radiolabelled bait. Of the two baits, mirex appeared to be more acceptable to both species of ant. With Acromyrmex, the ratio of living to dead fungus gardens was not affected by the bait used, whereas with Atta there was a significant difference, aldrin killing many more gardens than mirex. For both species the proportion of medium-sized workers radiolabelled was significantly greater than for the other castes, and mirex marked greater numbers of all castes than did aldrin. Greatly different proportions of Atta workers were radiolabelled in the different fungus gardens of a nest with both baits. More radioactivity was detected in the fungus gardens treated with mirex, the difference being significant for Atta but not for Acromyrmex. Mirex bait particles incorporated into the fungus gardens were significantly smaller than aldrin bait particles, indicating different degrees of comminution by the ants.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 63 , Issue 4 , June 1974 , pp. 609 - 618
Copyright
Copyright © Cambridge University Press 1974

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