Microstructure of the tarsal adhesive organs in the bark beetle Ips acuminatus, and their implication as external carriers of pathogens

Ips acuminatus is a common group of bark beetles that infest and damage pine and spruce trees. As a part of research for controlling this insect pest, the adhesive organs on the tarsal appendages were examined using field emission scanning electron microscopy (FE-SEM) to reveal the microstructural c...

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Bibliographic Details
Published in:Journal of Asia-Pacific entomology 2013, 16(2), , pp.181-187
Main Authors: Moon, Myung-Jin, Park, Jong-Gu, Koh, Sang-Hyun, Choi, Won-Il
Format: Article
Language:English
Subjects:
ADHESIF
Adhesive pad
ADHESIVES
ADHESIVOS
AGENT PATHOGENE
Bark beetle
barkk beetle
IPS ACUMINATUS
Microstructure
ORGANISMOS PATOGENOS
Pathogen
PATHOGENS
Scolytidae
Seta
농수해양학
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Summary:Ips acuminatus is a common group of bark beetles that infest and damage pine and spruce trees. As a part of research for controlling this insect pest, the adhesive organs on the tarsal appendages were examined using field emission scanning electron microscopy (FE-SEM) to reveal the microstructural characteristics of its biological attachment system. In addition, we also demonstrate their ability to act as external carriers of pathogens. This bark beetle has a characteristic attachment apparatus to move both smooth and rough surfaces. The claws are connected with a pretarsal segment, and their apical diverged hooks are developed to hold rough substrates; however, landing on smooth surfaces is achieved by means of three groups of hairy tarsal pads. The adhesive pads are basically composed of the flattened tip setae usually with a spatula-shaped endplate. Although this bark beetle did not have mycangial cavities, yeast-like spores were concentrated at the invaginated surface of legs where cuticular hairs are densely packed. In particular, the base stalk of the adhesive pad had a sufficient space to accept spores during the dynamic movement of tenent setae. [Display omitted] ► We observe microstructure of the tarsal attachment system in Ips acuminatus. ► Pretarsal claws have apical diverged hooks to hold rough substrates. ► Tarsal pads are composed of hairy setae with a spatula-shaped endplate. ► Cuticular surface of the pad has a sufficient space to accept yeast-like spores. ► Implication ability of pads to act as external carriers of pathogens is discussed.
ISSN:1226-8615
1876-7990
DOI:10.1016/j.aspen.2013.01.003