RESUMO
The effectiveness of 2 first generation anticoa tested gulant rodenticides, coumatetralyl and chlorophacinone with sulfaquinoxaline have been in the laboratory against Rattus norvegicus and R. rattus in Qatar. All animals died in 8 days when the 2 species of rats were fed for 4 successive days in the laboratory on bait containing 0.041245% coumatetralyl and after only 6 days when the bait contained 0.005% chlorophacinone + 0.019 sulfaquinoxaline. A field trial against R. norvegicus for 25 days with bait containing 0.04125% coumatetralyl lead to reduction of 93.6%, 92.9% and 90.2% of marks on rat tracking patches, active burrows, trapped rats and unpoisoned bait consumption, respectively. These values were 94.7%, 93.3%, 93.1% and 92.6% when infestation blocks were treated with 0.006% chlorophacinone + 0.019% sulfaquinoxaline. Similar results were achieved against R. rattus fed on coumatetralyl at 0.04125% for the same period, which realized percentage reductions of 91.9, 92.1 and 89.7 in foot prints, trapped rats and food consumption, respectively. These percentage reductions were 93.4, 93.1 and 90.5 when the infestation blocks treated with chlorophacinone 0.006% + sulfaquinoxaline 0.019%