Journal
CROP PROTECTION
Volume 25, Issue 3, Pages 269-274Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cropro.2005.04.017
Keywords
western corn rootworm; Diabrotica; aldrin; methyl-parathion; susceptibility
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The susceptibilities of laboratory and field-collected western corn rootworm populations (Diabrotica virgifera virgifera LeConte) to methyl-parathion and aldrin were estimated by topical application of insecticide during 2002 to determine the stability of resistance in the absence of selective pressures. Most of the laboratory-reared and field-collected populations were significantly resistant to both insecticides. Average LD50 values of laboratory and field-collected populations were 19- and 13-fold greater than the Susceptible population in methyl-parathion bioassays, respectively, and 204- and 125-fold greater in the aldrin bioassays, respectively. The presence of aldrin and methyl-parathion resistance in field-collected Populations strongly Suggests that both resistance traits are stable in the absence of selection pressure and that neither mechanism is associated with a strong fitness disadvantage. (c) 2005 Elsevier Ltd. All rights reserved.
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