EFFECTS OF POWDERED FORMICIDES IN CONTROLLING THE LEAFCUTTING ANT, Acromyrmex striatus (HYMENOPTERA: FORMICIDAE)
Abstract
To study alternatives in chemical control for the leaf cutting ant, Acromyrmex striatus (Roger, 1863), three field assays were conducted in 1997 and 1998 with powdered formicidae in Santa Maria, Rio Grande do Sul. Dosages and application methods were tested in the first assay, and dosages and commercial formulations were studied in other two experimenta. The effect of dosages, application methods and products were evaluated two and three times after application. Doses and application methods on the first assay were not efficient to control this ant species. Chlorpyrifos (20g a.i./kg), Fenthion (50g a.i./kg) and Deltamethrin (2g a.i./kg), beginning at 5 g per hill entrance of the commercial product, were effective in controlling this species. However, Diazinon (10g a.i./kg) rapidly inactivated the ant hills but did not eliminate, definitively, the nests of A. striatus.
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