Pityogenes hopkinsi
Swaine, 1915
chestnut-brown bark beetle
Pityogenes hopkinsi is a small in the , commonly known as the chestnut- bark beetle. It colonizes eastern pine (Pinus strobus) and uses a three-component to coordinate mass attacks on trees. The system involves sex-specific synergistic responses and male-produced inhibitory compounds that regulate attraction.
Pronunciation
How to pronounce Pityogenes hopkinsi: //ˌpɪ.ti.oʊˈdʒiː.niːz ˈhɒp.kɪn.saɪ//
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Identification
Specific diagnostic features for distinguishing P. hopkinsi from congeneric are not documented in available sources. As a member of Pityogenes, it likely exhibits the -characteristic small size and , but precise identification criteria require examination.
Habitat
Forests containing Pinus strobus (eastern pine). Colonizes naturally occurring and cut logs in forest environments.
Distribution
North America. Documented presence in Canada: Manitoba, New Brunswick, Newfoundland, and Nova Scotia.
Host Associations
- Pinus strobus - Colonized during and ; phloem feeding implied by biology
Life Cycle
proceeds through an attack phase mediated by attraction. Unmated males produce until female arrival, after which production ceases. Reproductive status directly influences pheromone production patterns.
Behavior
Males produce an blend of chalcogran, cis-verbenol, and ethyl dodecanoate to attract mates. output increases in unmated males and stops after female admission. Females respond maximally to chalcogran combined with ethyl dodecanoate; males respond to chalcogran synergized by cis-verbenol. Males emit 1-hexanol, which inhibits attraction of other males to the aggregation pheromone blend.
Ecological Role
Primary or secondary colonizer of Pinus strobus. Participates in -mediated mass attack dynamics characteristic of in forest .
More Details
Pheromone Chemistry
The is a three-component mixture: chalcogran, cis-verbenol, and ethyl dodecanoate. Ethyl dodecanoate represents a novel component at time of identification.