Journal of Entomological Science (2004) 39, 243-250

Jeffrey Gore and John J. Adamczyk Jr. (2004)
Selective feeding of soybean looper (Lepidoptera: Noctuidae) on meridic diet with different concentrations of the Bacillus thuringiensis Cry1Ac protein
Journal of Entomological Science 39 (2), 243-250
Abstract: The ability of soybean loopers, Pseudoplusia includens, (Walker), to selectively feed on meridic diet with different concentrations of Cry1Ac was investigated in a choice assay. Neonates selected non-treated meridic diet and diet with concentrations of Cry1Ac ranging from 0.1 to 1.0 µg/mL for feeding compared to diet with Cry1Ac concentrations of 5.0 and 10.0 µg/mL. Averaged across rating periods, means of 11.9 to 17.6% of larvae were observed feeding on diet with Cry1Ac concentrations ranging from 0.0 to 1.0 µg/ml, compared to 3.4% on diet with Cry1Ac concentrations of 5 µg/mL and 4.3% at 10 µg/mL. In a no-choice study, concentrations ranging from 0.1 to 1.0 µg/mL produced 4.3 to 40.8% mortality in soybean looper; while, concentrations of 5.0 µg/mL produced 58.5% mortality and 10.0 µg/mL produced 90.8% mortality. Also, diet with Cry1Ac concentrations of 5.0 and 10.0 µg/mL delayed the development of soybean looper larvae compared to diet with the other concentrations of Cry1Ac. Based on results of this study, soybean loopers can select diet with concentrations of Cry1Ac that result in low (<50%) levels of mortality.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Chrysodeixis includens
Bacillus thuringiensis Cry1A-toxin (entomopathogen)	Chrysodeixis includens