Abstract
Partial life tables were prepared for the red pine shoot moth, Dioryctria resinosella Mutuura, in three red-pine, Pinus resinosa Aiton, plantations in central Wisconsin during a period of shoot-moth population decline. Survivorship in the early instars ranged from 72–78% in 1982 and from 22–75% in 1983. In the fifth instar, survivorship ranged from 0–4% in 1982 and 0–31% in 1983. Pupal numbers were very low both years and survivorship was variable; it ranged from 0–100%. Phrynofrontina sp., Exeristes comstockii (Cresson), Bracon rhyacioniae (Muesebeck), Hyssopus rhyacioniae (Gahan), and Elachertus sp. were parasitoids present in high numbers. B. rhyacioniae caused the greatest impact on shoot-moth populations, particularly in the fifth instar. Heavy fifth-instar mortality appeared related to shoot-moth population declines. However, mortality in other life stages not included in the partial life tables, such as dispersing early instar larvae, possibly were involved.
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