Dendroctonus simplex
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Author(s): Darren Blackford, USDA Forest Service
Source: IPM Images
Dendroctonus simplex LeConte, 1868 - (eastern larch beetle)
The beetle attacks tamarack (Larix laricina) in North America, preferring weakened trees. While outbreaks are usually confined to small pockets of weakened trees, they can also extend over larger areas, causing substantial defoliation and tree death. E.g. starting in the year 2000, a large outbreak occurred in the Great Lakes Region, resulting in about 75,000 ha of larch forest being killed in the state of Minnesota (about 18% of the total number of tamarack trees in that state). For a summary see McKee and Aukema, 2015.
| Vernacular names | |
|---|---|
| • English: | eastern larch beetle |
| • Français: | dendroctone du mélèze |
Attacks are initiated by female beetles which release an aggregation pheromone, attracting others. The mass attacks can overwhelm the host defences. Usually, there is only one generation per year. However, depending on the climate, there may be only one generation every 2 years or 2 generations in one year. For overwintering, adult beetles might create hibernation galleries or remain in the pupal chambers.
