Effects of the Insect Growth Regulator Difluhenzuron on Non-Target Aquatic Populations in a Louisiana Intermediate Marsh

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Abstract
A study was conducted in a Louisiana coastal marsh to determine the ecological impact of the insect growth regulator diflubenzuron on populations of non-target aquatic organisms. Six applications of diflubenzuron (28 mg AI/ha) over an 18-mo period caused statistically significant differences in the population density of aquatic organisms when treated and untreated populations were compared. Populations of 5 taxa (nymphs of Trichocorixa louisianae Jaczewski and Buenoa spp., Coenagrionidae naiad spp., Berosus infuscatus LeConte adults, and Hyalella azteca (Saussure)) were significantly (P < 0.01) reduced while populations of 15 taxa ( Physa sp., Caenis sp. and Callibaetis sp. naiads, Noteridae larvae, Hydrovatus cuspidatus Kunze adults, Hydrovatus sp. larvae, Dytiscidae (tribe Bidessini) larvae, Mesovelia mulsanti Jaczewski adults, Trichocorixa louisianae adults, larvae of Chironomidae, Ephdridae, Dolichopodiae, and Tabanidae, and the fishes Gambusia affinis (Baird and Girard) and Jordanella fioridae (Goode and Bean) showed significant ( P < 0.05) increases after exposure to diflubenzuron. The analysis of data on the 27 remaining taxa collected indicated no statistically significant ( P > 0.05) difference when the treated and untreated populations were compared.

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