Size and growth of planted slash pines pinus elliottii var elliottii infected with fusiform rust cronartium quercuum f sp fusiforme

Froelich, R.C.; Nance, W.L.; Snow, G.A.

Forest Science 29(3): 527-534

1983


ISSN/ISBN: 0015-749X
Accession: 006424320

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Abstract
In experimental plantings of slash pine that incurred numerous rust infections in the 2nd, 4th and 5th seasons of growth, tall seedlings and saplings became infected more frequently than short ones in the 2nd and 5th seasons. In the 4th season, short trees became infected as often as tall ones, indicating that infection is not solely dependent on the quantity of tissue or number of shoots produced during a growing season. After trees became infected, their heights decreased relative to trees not infected. Magnitude of decrease was greatest in trees that incurred infections of main stems (vs. branches) in the first 2 yr. Decrease was also directly related to the degree of encirclement of the main stem by rust and to the development of witches'-brooms. Decreases in relative height preceded rust-associated mortality. Differences between sizes of infected and healthy trees several years after infection occurs are unreliable indicators of rust's impact on growth unless initial tree size and timing of all mortality are considered.