Bark beetles

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9 Terms

1
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Coleoptera: Curculionidae

Bark beetles

Bore just under outer bark

Live and feed on phloem

Entire life cycle in tree, adults only leave to find new host

2
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Dendroctonus genus

Rounded bodies with hind end forming D shape

Tiny but largest of the bark beetles

Least organized galleries

<p>Rounded bodies with hind end forming D shape</p><p>Tiny but largest of the bark beetles</p><p>Least organized galleries</p>
3
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Ips genus

Hollowed out hind end with spines

Forms curved i shape

Galleries have central chamber with male and 3-6 female branching off

<p>Hollowed out hind end with spines</p><p>Forms curved i shape</p><p>Galleries have central chamber with male and 3-6 female branching off</p>
4
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Scolytus genus

Hind end hollowed out on underside forming S

Fishbone gallery shape with straight central line and many branching off it

Smallest beetles with the most eggs and larvae

<p>Hind end hollowed out on underside forming S</p><p>Fishbone gallery shape with straight central line and many branching off it</p><p>Smallest beetles with the most eggs and larvae</p>
5
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Coleoptera: Curculionidae (Dendroctonus)

Mountain pine beetle

Most destructive western bark beetle and range is expanding the most

lodgepole and ponderosa pine

<p>Mountain pine beetle </p><p>Most destructive western bark beetle and range is expanding the most </p><p>lodgepole and ponderosa pine </p>
6
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Coleoptera: Curculionidae (Ips)

Pine engraver

Found throughout boreal forests

All pines and some spruce

3 generations/year

Infestations can develop in slash


<p>Pine engraver</p><p>Found throughout boreal forests</p><p>All pines and some spruce</p><p>3 generations/year</p><p>Infestations can develop in slash</p><p></p>
7
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Coleoptera: Curculionidae (Scolytus)

European elm bark beetle

Main vector of Dutch Elm Disease

Spread by leaving bark as adults in May to feed on nearby trees and contaminate the new wood vessels near surface of the twigs

If find know tree has DED

Vertical fishbone galleries


<p>European elm bark beetle </p><p>Main vector of Dutch Elm Disease</p><p>Spread by leaving bark as adults in May to feed on nearby trees and contaminate the new wood vessels near surface of the twigs</p><p>If find know tree has DED</p><p>Vertical fishbone galleries</p><p></p>
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Native elm bark beetle

Coleoptera: Curculionidae

Fishbone galleries but horizontal to grain

Second important vector to DED

Not as abundant as the smaller European

Most important in North


<p>Coleoptera: Curculionidae</p><p>Fishbone galleries but horizontal to grain</p><p>Second important vector to DED</p><p>Not as abundant as the smaller European</p><p>Most important in North</p><p></p>
9
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Walnut twig beetle

Coleoptera: Curculionidae

Typically horizontal adult and vertical larvae

Small round dark cankers

Vector for thousand cankers disease (TCD)

Black walnut

First found in Colorado

<p>Coleoptera: Curculionidae</p><p>Typically horizontal adult and vertical larvae</p><p>Small round dark cankers</p><p>Vector for thousand cankers disease (TCD)</p><p>Black walnut</p><p>First found in Colorado</p>