caa a22 4500 397571763 CHVBK 20180308164843.0 cr unu---uuuuu 161202e19960201xx s 000 0 eng 10.1093/ee/25.1.17 doi (NATIONALLICENCE)oxford-10.1093/ee/25.1.17 Effects of the Insect Growth Regulator Diflubenzuron on Insect Emergence within Littoral Enclosures [Elektronische Daten] [Karsten Liber, Kurt L. Schmude, Timothy D. Corry] Effects of the insect growth regulator diflubenzuron on insect emergence were investigated in littoral enclosures in a pond in northeastern Minnesota. Adult insects were captured with floating emergence traps before and after each of 2 applications with 4 different diflubenzuron rates. Emergence was reduced by up to 87, 96, and 99% relative to controls 4-8 d after the 1st application with 2.5, 7.0, and 30 μg/liter diflubenzuron, respectively. None of the affected populations returned completely to control levels by the time of the 2nd application. Reductions of ≤18% in insect emergence at the 0.7 μg/liter treatment were not statistically significant. Effects of the 2nd diflubenzuron application were similar to those of the 1st. Based on measured maximum exposure concentrations, the no observable and lowest observable effect concentrations for insect emergence were 1.0 and 1.9 μg/liter, respectively. Concentration-response analyses of the data indicated that the field EC50 for insect emergence inhibition ranged from 1.0 to 1.4 μg/liter, depending on the calculation method and on whether nominal or measured diflubenzuron concentrations were used. The estimated maximum acceptable toxicant concentration for Chironomidae was 0.7-0.8 μg/liter. Overall, significant adverse effects on insect emergence could be expected at diflubenzuron concentrations > 1.0 μg/liter with the length and severity of effect being concentration dependent. © 1996 Entomological Society of America Pest Management and Sampling nationallicence Chironomidae nationallicence diflubenzuron nationallicence emergence inhibition nationallicence littoral enclosures nationallicence Liber Karsten Lake Superior Research Institute, University of Wisconsin-Superior, 1800 Grand Avenue, Superior, WI 54880 aut Schmude Kurt L. Lake Superior Research Institute, University of Wisconsin-Superior, 1800 Grand Avenue, Superior, WI 54880 aut Corry Timothy D. Lake Superior Research Institute, University of Wisconsin-Superior, 1800 Grand Avenue, Superior, WI 54880 aut Environmental Entomology Oxford University Press 25/1(1996-02-01), 17-24 0046-225X 25:1<17 1996 25 ee https://doi.org/10.1093/ee/25.1.17 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.1.17 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liber Karsten Lake Superior Research Institute, University of Wisconsin-Superior, 1800 Grand Avenue, Superior, WI 54880 aut NATIONALLICENCE 700 1- Schmude Kurt L. Lake Superior Research Institute, University of Wisconsin-Superior, 1800 Grand Avenue, Superior, WI 54880 aut NATIONALLICENCE 700 1- Corry Timothy D. Lake Superior Research Institute, University of Wisconsin-Superior, 1800 Grand Avenue, Superior, WI 54880 aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/1(1996-02-01), 17-24 0046-225X 25:1<17 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford