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Spruce Beetle Video Stock Footage
The initial attack in the lower trunk is indicated by the red boring dust in the bark crevices and by pitch tubes, especially when weakened or recently dead trees are attacked. Overwintering adults construct egg tunnels for brood 1 in June, and a second set of tunnels in late July for brood 2. Some members of brood 1 emerge as adults in late July and construct additional tunnels, while others overwinter as mature larvae and emerge as adults in July, along with another segment of the population that has overwintered as early larvae. A smaller bark beetle often found in spruce is the foureyed spruce bark beetle Polygraphus rufipennis Kirby. The insect has a 1-, 2-, or 3-year life cycle, with 2-year being the most common, in which the flight and attack period starts in June or soon after most of the snow around the trees has melted. About 6 galleries per 929 cm2, each about 12.5 cm long and parallel with the grain of the wood, are made in the inner bark, and 3 to 4 groups of eggs are laid along the sides of the galleries, about 100 eggs per gallery. .Eggs hatch in 3 to 4 weeks. Larvae vary in size from about one-quarter to fully grown by the onset of the dormant season. They resume development the following June, pupate during the summer, and transform to the adult stage in later summer or early fall. The adults generally emerge from the trees, fall or crawl to the ground, and re-enter the same tree to hibernate, often clumping together under the bark. They emerge t...Learn more about Spruce Beetle
View related species in family group: Beetle
Animalia: Arthropoda: Coleoptera: Insecta: Curculionidae: Dendroctonus rufipennis