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Effects of the mosquito larvicides temephos and methoprene on insect populations in experimental ponds

Environmental Toxicology and Chemistry

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Abstract

The nontarget effects of Abate 4E ? (44.6% temephos) at 0.054 kg of active ingredient (a.i.) per 1 ha and of Altosid Liquid Larvicide ? (5% methoprene) at 0.011 kg a.i./ha were investigated in 18 experimental ponds (average area, 202 m2; maximum depth, 0.7 m) at Patuxent Wildlife Research Center, Laurel, Maryland, USA. Ponds were sprayed three times at 3-week intervals. Six ponds were sprayed with Abate, six with Altosid, and six with distilled water. Two insect-emergence traps per pond collected for 7 d and were then harvested 1 d before each spray and 13 to 14 days afterward. A repeated measures analysis of variance (ANOVA) revealed significant reductions in Shannon diversity, equatability, and numbers of individuals, species, and families in the Abate ponds relative to controls. Significant reductions also occurred in Ephemeroptera, Odonata, Diptera, Chironomidae, and Chaoborus sp. Hester-Dendy samplers were installed before spray one and harvested 16 d after spray three. Based on one-way ANOVA, Shannon diversity, equatability, and number of Ephemeroptera and Chironomidae were significantly reduced in the Abate ponds. Emergence data indicate only isolated cases with significant reductions in the Altosid ponds relative to controls, and the Hester-Dendy data indicate no significant differences between the Altosid and control ponds.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of the mosquito larvicides temephos and methoprene on insect populations in experimental ponds
Series title:
Environmental Toxicology and Chemistry
Volume
19
Issue:
3
Year Published:
2000
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
678-684
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Toxicology and Chemistry
First page:
678
Last page:
684