Abstract
Dark rover ants (Brachymyrmex patagonicus, Mayr) are an exotic ant species native to South America that has recently spread through the southern US. We evaluated the residual activity of three liquid insecticides (indoxacarb, fipronil and lambda-cyhalothrin) as potential barrier treatments against these ants. The factors we considered include the use of a porous or non-porous surface, a short or long exposure time and the changes in insecticide activity after treatment during a 90 day period. We also tested the effect of baits containing three different active ingredients (imidacloprid, sodium tetraborate and indoxacarb) on colony fragments of this species for a 15 day period. Both lambda-cyhalothrin® and indoxacarb® resulted in high levels of ant mortality up to 90 days after application. The results of exposure to fipronil® resembled those from the control treatment. Application of insecticides on a porous surface and the shorter exposure time generally resulted in greater ant survival. Of the baits tested, only the imidacloprid based one decreased ant survival significantly during the evaluation period. Within three days, the imidacloprid bait produced over 50% mortality which increased to over 95% by the end of the experiment. Results from the other two bait treatments were not significantly different from the control.
Highlights
Dark rover ants (Brachymyrmex patagonicus Mayr, 1968) are an exotic ant species native to SouthAmerica [1] and were first reported in 1978 in Louisiana as Brachymyrmex musculus [2]
Dark rover ants had the lowest survival after exposure to lambda-cyhalothrin, and indoxacarb at the (2X) and (4X) application rates (Table 3)
Indoxacarb applied at the lowest label prescribed rate (1X) had a slightly lower effect against dark rover ants
Summary
America [1] and were first reported in 1978 in Louisiana as Brachymyrmex musculus [2] This recently introduced invasive ant has increased its distribution range and is currently located in most of the southern United States and in spots in the arid southwest [3,4,5]. These small (approximately 2 mm in length), dark brown ants form colonies with the potential of including thousands of individuals. Due to their recent emergence, little is known about the susceptibility of this species to currently available management techniques and insecticides
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