Abstract
Life tables were constructed for six generations of Rhyacionia frustrana (Comstock) and for one generation of Rhyacionia rigidana (Fernald) in a 2- to 3-year-old loblolly pine plantation. Overlapping stage-density trend curves were estimated for each generation by a schedule of two-stage cluster samples. Population models were applied to these curves to estimate stage recruitments for the life tables. Important mortality occurred during egg and pupal stages. Egg mortality was high, and perhaps density dependent. Triehogramma sp. caused much egg mortality in generations 2 and 3, but an unknown factor caused most generation 1 egg mortality. Fifth-instar larvae were heavily parasitized by Lixophaga mediocris Aldrich, but this mortality was constant and was not a key factor. Some pupal mortality was caused by parasites. However, sources of most pupal mortalily were not identified. The pattern of survivorship for R. rigidana was similar except for high 1st-instar mortality, apparently due to resin from feeding wounds on pine Shoots. Sex ratios and fecundities were also examined.
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