Activity of a hydramethylnon-based bait against the citrus ant pests, Iridomyrmex rufoniger gp. spp.and I. purpureus

David G. James, Mark M. Stevens, Karen O'Malley and Renay Heffer, Yanco Agricultural Institute, NSW Agriculture, Yanco, New South Wales 2703, Australia.


A commercial granular ant bait, Arinosu-Korori™, containing hydramethylnon was readily collected by the citrus ant pests, Iridomyrmex rufoniger gp. spp. and I. purpureus, and provided good control in small scale field experiments on single trees and nests. Ten grams of bait at the base of citrus trees containing foraging I. rufoniger gp. spp. significantly reduced the number of foragers after three days, and for up to 75 days. The same quantity of bait killed all individuals in a 1 m2 nest of I. purpureus which remained ant-free for at least 91 days. The bait also significantly reduced numbers of ants in a 2 m2 nest for 35 days, however, no significant reduction in ant numbers occurred in a 4 m2 nest. Prospects for using this bait in controlling ant populations in citrus groves are discussed.


Plant Protection Quarterly (1996) 11 (3) 122-125.