This research was developed in an Eucalyptus plantation of Jari Celulose S.A., in Almerin, Pará State, Brazil from September 1996 to January 1997. The objectives were to test the efficiency of two ant baits with sulfluramid and another one with chlorpirifos (at 4, 6, 8 and 10 grams per square meter of ant nest) against Acromyrmex laticeps nigrosetosus Forel (Hymenoptera: Formicidae). Both baits with sulfluramid, in all dosages tested, showed more than 99.0% of transport with no devolution. All ant colonies treated with these baits were dead during the final evaluation while mortality of nests of this ant treated with chlorpirifos ranged from 55.56 to 66.67% for the different dosages tested. The sulfluramid baits can be recomended to control A. laticeps nigroselosus in the humid tropic of Brazil.
leaf-cutting ants; Eucalyptus; ant baits; Acromyrmex