Cross-resistance of the obliquebanded leafroller,Choristoneura rosaceana (Harris), to tebufenozide wasreported from laboratory studies before it had been used in commercialorchards in New York State. Bioassays with obliquebanded leafrollerlarvae from tebufenozide and organophosphate susceptible and resistantcolonies were conducted with chlorfenapyr, emamectin benzoate,fenoxycarb, fipronil, spinosad, and tebufenozide to determine ifcross-resistance was present before these new insecticides wereintroduced into commercial orchards. Resistance ratios ranged from 1.1to 3.2 for all insecticides except tebufenozide (12.8). Significantdifferences between susceptible and resistant colonies were found withemamectin benzoate, fenoxycarb, and fipronil. The effect of themetabolic synergists piperonyl butoxide (PBO) and diethyl maleate (DEM)on tebufenozide toxicity was examined to determine mechanisms forobliquebanded leafroller resistance to tebufenozide and potentialmechanisms for other new insecticides. At a concentration of 20 ppm,PBO and DEM significantly synergized the toxicity of tebufenozide inresistant and susceptible colonies (three- to fourfold). Obliquebandedleafrollers may be resistant to new insecticides with distinct modes ofaction even if these compounds have not been previously used incommercial orchards.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 93 • No. 6