The combined range of the red imported fire ant ( Solenopsis invicta Buren), black imported fire ant ( Solenopsis richteri Forel), and their hybrid covers much of the southeastern United States and other isolated regions further west (U.S. In addition, nootka oil could be beneficial in situations where ant suppression rather than complete quarantine elimination is the management goal.Īlaskan yellow cedar, Solenopsis invicta, Solenopsis richteri, hybrid imported fire ant, nursery production Although the formulation tested here did not perform to Federal Imported Fire Ant Quarantine standards, other formulations may enable this product to reach 100% control. The quarantine-approved bifenthrin band treatment maintained 100% control from the 2nd to 24th wk. In a band application evaluation, nootka oil plots maintained a 90–95% reduction in fire ant mounds from the 2nd to 17th wk, when new mounds began to intrude on the field plots. In a field drench test, mortality of mounds treated with nootka oil lagged behind mounds treated with bifenthrin treatment for 7 wk, but both nootka oil and bifenthrin had higher mortality than the untreated check at the end of the 12-wk evaluation period. Higher worker mortality was also observed in contact and fumigation assays compared to control checks. In digging assays, ants were repelled by nootka oil and digging continued to be suppressed by nearly 50% in nootka oil-treated sand aged 6 mo in the laboratory. Don) Spach, has activity against hybrid imported fire ant workers, Solenopsis invicta Buren × Solenopsis richteri Forel. In this study, we demonstrate that the essential oil of the Alaskan yellow cedar, Cupressus nootkatensis (D. This demand has led to increasing focus on plant essential oils as sources of new biopesticides.
Recent concerns regarding the impact of traditional synthetic pesticides on nontarget organisms have generated demand for alternative products with lower environmental impact.
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