Behavioral and electrophysiological responses of Arhopalus tristis to burnt pine and other stimuli

The exotic longhorn beetle Arhopalus tristis is a pest of pines, particularly those damaged by fire, and a major export quarantine issue in New Zealand. Actinograph recordings of caged individuals showed that males and females were most active from dusk to midnight. Olfactometer experiments indicate...

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Bibliographic Details
Published in:Journal of chemical ecology 2001-06, Vol.27 (6), p.1091-1104
Main Authors: SUCKLING, D. M, GIBB, A. R, DALY, J. M, CHEN, X, BROCKERHOFF, E. G
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal behavior
Animal, plant and microbial ecology
Animals
Arhopalus tristis
Autoecology
Behavior, Animal
Biological and medical sciences
Cerambycidae
Chemotaxis
Coleoptera - physiology
Control
Electrophysiology
Female
Fires
Fundamental and applied biological sciences. Psychology
Integrated pest control
Mineral oils
Odorants
Oviposition
Phytopathology. Animal pests. Plant and forest protection
Pinus
Pinus - chemistry
Protozoa. Invertebrata
Protozoa. Invertebrates
Smell
Volatilization
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Summary:The exotic longhorn beetle Arhopalus tristis is a pest of pines, particularly those damaged by fire, and a major export quarantine issue in New Zealand. Actinograph recordings of caged individuals showed that males and females were most active from dusk to midnight. Olfactometer experiments indicated that females moved upwind toward odors from burnt pine (80%, N = 75), compared to unburnt pine (20%). Oviposition choice tests showed that eggs were predominantly laid on burnt logs (79%, N = 20), compared to unburnt logs. Beetles were trapped by funnel traps baited with burnt (mean catch per trap 7.8) and unburnt (mean catch 4.1 per trap) pine bark from inside a screen cage (4 x 3 m), while unbaited traps had a mean catch 0.1 beetles (N = 8 replicates). The treatment of burnt pine bark with a 1:1:2 mixture of green leaf volatiles (E)-2-hexen-1-ol and (E)-2-hexenal) in mineral oil as a repellent reduced trap catch by fivefold in a similar experiment (mean catches of 1.2 beetles per trap to burnt pine bark plus repellent treatment and 6.2 beetles per trap to burnt pine bark alone). The treatment of burnt pine bark with this solution also reduced oviposition by 98.5% (mean eggs per log of 11.1 on burnt pine and 0.3 on burnt pine plus repellent), indicating that oviposition cues have the potential to be significantly disrupted. The electrophysiological responses of adult beetles were recorded to a range of odorants. Normalized responses to monoterpenes known to occur in Pinus radiata ranged from about 20 to about 150, with alpha-terpineol giving the greatest responses in both sexes. Green leaf volatiles also gave high responses. The potential exists to improve the management of this insect using chemical cues in various ways.
ISSN:0098-0331
1573-1561
DOI:10.1023/A:1010355710509