Fipronil is currently used as chemical barrier against subterranean termites, in this paper their possible use as bait has been tested. Their efficacy with Reticulitermes grassei Clément in feed forced and feed choice tests has been analyzed, evaluating the mortality caused by administration of fipronil at 1 and 10 ppm (wt/wt). Our results show that 90% mortality is achieved at 6 days with feed forced test at 10 ppm and 16 days at 1 ppm; but with choice test the time to achieve that level of mortality is increased to 17 days for 10 ppm and only 50% mortality in 28 day is obtained with 1 ppm. Moreover the filter paper consumed by termite/day has been evaluated, founding a diminution of ingestion with the increase of concentration. This suggests a possible unpalatability of product at all tested concentrations.

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