| 11. | $2 million to combat the spruce bark beetle investation on Alaska's Kenai Peninsula
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| 12. | Some olfactory signals directly from other bark beetles, but also some compounds from trees.
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| 13. | As the tree declines, more bark beetles are attracted and more cankers are formed.
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| 14. | Bark beetles were killing more than twice as many trees as a decade earlier.
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| 15. | The hickory bark beetle probably destroys more sawtimber-size mockernut trees than any other insect.
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| 16. | In Colorado, the pine bark beetle is a common parasite.
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| 17. | Later, bark beetles ( " Pseudopityophthorus pubipennis " ) produce fine, red boring dust.
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| 18. | Bark beetles communicate with one another using semiochemicals, compounds or mixtures that carry messages.
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| 19. | Previously, cold spells had killed off bark beetles which are now attacking the forests.
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| 20. | Only the natural stereoisomer, ?-multistriatin, attracts the elm bark beetles.
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