Abstract
Controlled-release chlorpyrifos trunk bands excluded foraging ants ( Iridomyrmex spp.) from citrus tree canopies for four growing seasons (182 and 211 weeks in two separate trials). The level of exclusion averaged 92.7% over the full period of the trials. Laboratory bioassays of weathered band material showed the bands were still toxic to ants (98 - 100% mortality) after 200 and 229 weeks. In contrast, trunk applications of lambda-cyhalothrin and a chlorpyrifos 'emulsion' were very short-lived (< 14 weeks) in their activity against foraging ants; levels of exclusion over 15 to 18 weeks averaged 46% for lambda-cyhalothrin and 23% for the chlorpyrifos 'emulsion'. The potential of controlled-release chlorpyrifos trunk bands as a practical management strategy for foraging ants in citrus groves is discussed.
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