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    Author(s): James P. Dunn; Peter L. Jr. Lorio
    Date: 1993
    Source: Environ. Entomol., Vol. 22(5): 948-957
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (3.36 MB)

    Description

    We modified soil water supply to two groups of juvenile loblolly pines, Pinus taeda L., by sheltering or irrigating root systems in early summer or in later summer and measured oleoresin flow (primary defense), net photosynthesis, xylem water potential, and cambial growth throughout the growing season. When consistent significant differences in oleoresin flow and water potentials were detected between treatments, we induced attack by the southern pine beetle, Dendroctonus frontalis Zimmermann. Compared with irrigated trees, sheltered trees had lower xylem water potentials, reduced cambial growth, reduced photosynthesis, and reduced resin flow. In terms of response to beetle attack, sheltered trees had fewer attacks and less total gallery constructed, but those beetles that did attack sheltered trees were more successful (50-100% more eggs per sheltered trees (only three to eight eggs per attacking pair). This performance, along with water deficits that strongly affected tree physiology, growth, and development, indicates that juvenile loblolly pine can make internal adjustments thatl imit the success of southern pine beetle attack.

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    Citation

    Dunn, James P.; Lorio, Peter L. Jr. 1993. Modified water regimes affect photosynthesis, xylem water potential, cambial growth and resistance of juvenile Pinus taeda L. to Dendroctonus frontalis (Coleoptera: Scolytidae). Environ. Entomol., Vol. 22(5): 948-957

    Keywords

    Dendroctonus frontalis, drought, plant defense

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