Abstract
Diterpene resin acids significantly affect consumption rates, feeding efficiencies, and growth rates of the larch sawfly,Pristiphora erichsonii (Hartig) when topically applied to their natural food, tamarackLarix laricina (DuRoi) K. Koch. Abietic acid, neoabietic acid, dehydroabietic acid, and isopimaric acid significantly reduced consumption rates, feeding efficiencies, and growth rates. Sandaracopimaric acid reduced growth and efficiency but did not influence consumption rate. Two-way analysis of variance indicates a significant interaction between chemical and concentration for growth rate, feeding efficiency, and consumption rate. This interaction indicates that increasing chemical concentrations do not influence the larch sawfly in a uniform manner, supporting the concept of concentration-dependent biological activity of allelochemics.
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Research supported by School of Natural Resources College of Agriculture and Life Sciences, University of Wisconsin-Madison and School of Forestry, Northern Arizona Univeristy under grants from the McIntire-Stennis Program.
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Wagner, M.R., Benjamin, D.M., Clancy, K.M. et al. Influence of diterpene resin acids on feeding and growth of larch sawfly,Pristiphora erichsonii (Hartig). J Chem Ecol 9, 119–127 (1983). https://doi.org/10.1007/BF00987776
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DOI: https://doi.org/10.1007/BF00987776