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    Author(s): W.D. Boyer; F.W. Woods
    Date: 1973
    Source: Forest Sci. 19:315-318
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (59 KB)


    Air temperatures in the microenvironments of flower buds of Pinus palustris Mill. appear to be a major determinant of flowering date. Shoots bearing staminate strobili on each of 10 trees were bagged at different times and for varying lengths of time in January and February. Bagging treatments provided 488 to 3,852 additional degree-hr of heat above 50°F accumulated from January 1. Flowering date was advanced more or less in proportion to added heat, up to an average of 8.6 days ahead of unbagged controls. Individual trees varied widely in date of pollen shedding.

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    Boyer, W.D.; Woods, F.W. 1973. Date of Pollen Shedding by Longleaf Pine Advanced by Increased Temperatures at Strobili. Forest Sci. 19:315-318


    Pinus palustris, heat sums, phenology

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