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Toxicities of the eight quinones were evaluated through leaf dip bioassays conducted against Tetranychus urticae, Myzus persicae, Myzocallis walshii, and Illinoia liriodendri. Based on LC 50 values, plumbagin (LC 50 =0.001%) was the most active compound against T. urticae and ubiquinone Q 0 (LC 50 =0.005%), plumbagin (LC 50 =0.010%), and dibromothymoquinone...
We investigated the feeding deterrent effects and toxicity of naturally occurring and synthetic quinones to the cabbage looper, Trichoplusia ni. Feeding deterrent effects were determined via a leaf disc choice bioassay. Based on DC 50 values, 1,4-naphthoquinone was the most active antifeedant (DC 50 = 1.8 μg/cm 2 ) followed by juglone (DC 50 = 2.1 μg/cm 2 ...
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