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Defoliation intensity and larval age interact to affect sawfly performance on previously injured Pinus resinosa

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Abstract

Rapidly induced responses can alter host plant suitability for insect growth and survival. The effects of defoliation on the suitability of potted 5-year-old red pine, Pinus resinosa Ait., for the sawfly Neodiprion sertifer (Hymenoptera: Diprionidae), were measured in two experiments. In the first, overall larval growth rate increased on seedlings within 8 days of low (<15%) defoliation. Suitability varied among larval age groups: defoliation increased the performance of older larvae, but not that of young larvae. In the second experiment, larval survival and weight varied non-linearly with defoliation intensity 8 weeks after treatment. Similar responses were observed following artificial and natural defoliation, and on early- and late-season seedlings. These results suggest that some evergreen conifers can respond rapidly to defoliation injury, and that herbivores may simultaneously acclimate to the induced response as they develop. The relative importance of induced response rates to plant-insect interactions is discussed.

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  1. Department of Entomology, University of Wisconsin-Madison, 53706, Madison, WI, USA

    Steven C. Krause & Kenneth F. Raffa

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  1. Steven C. Krause
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  2. Kenneth F. Raffa
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Krause, S.C., Raffa, K.F. Defoliation intensity and larval age interact to affect sawfly performance on previously injured Pinus resinosa . Oecologia 102, 24–30 (1995). https://doi.org/10.1007/BF00333306

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