The “modified excised leaf disc method” is based on leaf discs that fit tightly the bottom halves of 50-mm petri dishes. The bottom half of each petri dish is covered with wet cotton wool to prolong leaf freshness. The side wall of each bottom half has a small hole to allow the petiole of the leaf disc to protrude outside the petri dish. The top half of each petri dish has a 28-mm (diameter) window. For phytophagous mites the window is covered with a 40-µm mesh Pecap polyester screen. Using this method it was possible to estimate the LC50 value of bifenazate to be 0.00413 g (AI) /liter and the LC50 value of spirodiclofen to be 0.40050 g (AI)/liter to the twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae). The method reduces losses due to escapees and allows observations to be made as long as 9 d after treatment.
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1 December 2009
A Modified Excised Leaf Disc Method to Estimate the Toxicity of Slow- and Fast-Acting Reduced-Risk Acaricides to Mites
Noubar J. Bostanian,
Serge Beudjekian,
Erin McGregor,
Gaétan Racette
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Journal of Economic Entomology
Vol. 102 • No. 6
December 2009
Vol. 102 • No. 6
December 2009
bioassays
laboratory method
lethal concentration
Tetranychus urticae