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David Bakker

Orienteering Mapper, UBCO Biochem

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MacPherson North Boundary Creek

Posted June 13, 2018 David

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⟵MacPherson North Boundary Creek

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Instagram post 18015592867103353

Instagram post 18015592867103353

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Instagram post 17905442491243212

Instagram post 17905442491243212

A frog chilling in the woods outside Revelstoke. I

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These fascinating patterns in the inside of a piece of Douglas fir bark stew caused by a parasitic beetle that generally results in large amounts of deadfall. Here is the description of the insect by the BC government.
Douglas-Fir Beetle

The Douglas-fir beetle (Dendroctonus pseudotsugae) is the principal killer of mature Douglas-fir in B.C. It usually attacks weakened or dying trees, but occasionally its populations increase to the extent that it infests and kills large numbers of healthy trees. Aerial overview surveys recorded 47,628 hectares of damage in 2015.

This beetle is most common in B.C.'s Interior. Though it can be found in coastal forests, it rarely causes the large-scale damage seen inland.

It attacks its host in early summer. The beetle usually attacks weakened trees (e.g., drought or wildfire damage) or trees blown down by windstorms. When it attacks healthy trees, it targets the largest and oldest first — those most valued as wildlife habitat, particularly for mule deer winter range.

Description
Adult Douglas-fir beetles are dark brown to black with reddish wing covers, and are tiny (about 4.4 to 7 millimetres long). The life cycle is usually one year, and two broods may be produced.

Distribution

Native to North America, this insect is found throughout the range of the Douglas-fir, its principal host.

Management

Strategy depends on infestation size, stand susceptibility and other factors. Detection involves walkthroughs, probes and star probes (a type of ground probe). Treatment can involve sanitation harvesting, trap trees and other techniques.

Tree Species Attacked
Large diameter, mature Douglas-fir trees are attacked; also, occasionally, downed western larch. Trees are killed when the flow of food and water between roots and needles is blocked by feeding larvae and by dead sapwood cells killed by the blue-stain fungi carried by the Douglas-fir beetle adults.
Damage Symptoms

Recently attacked trees are difficult to identify except for reddish brown boring dust that may accumulate on the trunk and in bark crevices. Foliage of killed trees turns from green to pale yellow-green to red by the spring of the year following the attack

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Storm clouds over Kamloops BC.

Storm clouds over Kamloops BC.

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.
📷Robert Svoboda

Instagram post 17848632556228362

Instagram post 17848632556228362

A stressed student productions presents "Running F

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