Effects of a Temephos Application on Nuisance Chironomidae (Diptera) and Non-target Invertebrates in a Residential-Recreational Lake in Florida

Abstract

A granular formulation of temephos (Abate~-5CG) was applied at 0.28 kg Al/ha (or 0.007 ppm) to a 7-ha man-made residential-recreational lake in Florida to control larval chironomids, Chironomus sp., Polypedilum sp., Tanytarsus spp. and Tanypodinae. Populations of Polypedilum sp. were reduced >92% for 51 days posttreatment, while Chironomus sp. and Tanytarsus spp. were reduced by 74-91% and 77-92%, respectively, 16 days posttreatment. Populations of Tanypodinae, showing an initial decline of 31% at 2 days posttreatment, generally remained higher than the pretreatment level during 51 days posttreatment. Overall, temephos caused 87-97% reduction of to1al midge larvae for 37 days. Larval Chaoborus sp. also decreased after treatment, but these decreases were statistically not significant (P > 0.05). Populations of benthic Nematoda and zooplankton, consisting primarily of nauplius and mature Diaptomus spp. Copepoda and Rotifera, were not adversely affected by the insecticidal treatment.

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