Efficacy of Two Formulations of the IGR, Diflubenzuron, Against Midges (Diptera: Chlronomidae) in Experimental Ponds

Abstract

The IGR, diflubenzuron in 2 formulations (Dimilin 25 WP and a tablet, Diflox Compresse) was tested at 0.05
and 0.2 kg Al/ ha for efficacy against chironomid midges in man-made ponds. The WP gave high levels of initial
control; the low rate suppressed 80-99% adult midge emergence for 21 days and the high rate 62-100% for 35 days.
The tablet formulation gave initially delayed but more prolonged control of midges than the WP. It caused 60-78% reduction of adult midges during 14-42 days posttreatment at 0.05 kg Al/ ha and 54-97% during 7-49 days posttreatment at 0.2 kg Al/ ha. The use of both formulations in combination in a midge habitat, with the tablets introduced 2-3 weeks later than the WP would provide immediate as well as prolonged control of midges.

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