Insect Growth Regulator Effects on Colonies of the Imported Fire Ant

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Abstract:

Insect growth regulators (IGR) fed via soybean oil to small colonies of Solenopsis invicta Buren resulted in an immediate drop in pupal numbers due to cannibalism by the workers and a gradual decline in the number of eggs in the colony. No effects on larvae were observed until pupation. In all colonies treated with an IGR, female reproductive caste pupae were observed in the colony 20–30 days after exposure. Death of colonies of imported fire ants occurred at doses of 5 mg or greater per colony.

Contact and fumigation routes of exposure were more effective than feeding. Formulation of the IGR in a carbohydrate or protein food source had no effect on its activity.

Document Type: Research Article

Publication date: October 1, 1974

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