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Observations On A Dendroctonus Simplex (Coleoptera: Curculionidae: Scolytinae) Outbreak In A Rangewide Tamarack (Larix Laricina) Provenance Plantation In Michigan, Robert A. Haack, Richard W. Blank

The Great Lakes Entomologist

A tamarack [Larix laricina (Du Roi) K. Koch] provenance plantation, consisting of 33 seed sources from the United States and Canada, was established in 1969 in southern Michigan (Kalamazoo County). About half of the trees were removed in fall 1984 when the stand was thinned, with the cut trees piled on the edge of the stand. The stand then experienced a severe ice storm in January 1985. The eastern larch beetle, Dendroctonus simplex LeConte, colonized the cut logs in 1985 and also infested many of the standing trees. By the end of 1986, over half the remaining trees had …