Post hoc assessment of host plant use in a generalist invader: implications for understanding insect-plant interactions and weed biocontrol

Rafter, M. A. and Walter, G. H. (2013) Post hoc assessment of host plant use in a generalist invader: implications for understanding insect-plant interactions and weed biocontrol. Arthropod - Plant Interactions, 7 4: 379-388. doi:10.1007/s11829-013-9251-6


Author Rafter, M. A.
Walter, G. H.
Title Post hoc assessment of host plant use in a generalist invader: implications for understanding insect-plant interactions and weed biocontrol
Formatted title
Post hoc assessment of host plant use in a generalist invader: implications for understanding insect–plant interactions and weed biocontrol
Journal name Arthropod - Plant Interactions   Check publisher's open access policy
ISSN 1872-8855
1872-8847
Publication date 2013-08
Sub-type Article (original research)
DOI 10.1007/s11829-013-9251-6
Volume 7
Issue 4
Start page 379
End page 388
Total pages 10
Editor Walter Carson
Place of publication Netherlands
Publisher Springer Netherlands
Collection year 2014
Language eng
Formatted abstract
Structured host-choice and no-choice tests were conducted to help clarify the host plant interactions of an insect herbivore that is simultaneously seen as broadly polyphagous and pestiferous (in Africa) and host restricted/beneficial (in Australia). The research reported here involves specification of the host range of the invasive population of Scirtothrips aurantii found on Bryophyllum in Australia and included tests involving three separate lists of plant species considered to have the potential for thrips attack (plants of horticultural concern, native species at risk of attack and species listed for screening in the search for specialist B. delagoense biocontrol agents). This procedure was developed specifically to deal with the S. aurantii situation in Australia. Because the test species is already present in the field, the conclusions from the tests could be evaluated independently against field sampling results. Host testing revealed that the fundamental host range of the Bryophyllum population of S. aurantii includes Macadamia integrifolia, Mangifera indica and Kalanchoe blossfeldianna. However, the choice tests (involving B. delagoense) and a field survey of Man. indica demonstrated conclusively that the realised host range of S. aurantii in the field is restricted to Crassulaceae. We recommend that host testing of generalist insects not be discounted out of hand (for biological control) because of their perceived polyphagy. Any evidence of populations being strongly associated with the weed species of interest (through quantified host association studies in the native range) suggests further scrutiny of that population is warranted, by means of the host testing methods developed here and in conjunction with appropriate tests of the population’s species status.
Keyword Bryophyllum
Generalist species
Host testing
Invasion
Scirtothrips aurantii
Bryophyllum-delagoense Crassulaceae
Scirtothrips-aurantii Faure
Biological-control agents
Candidate agent
Range
Specificity
Australia
Curculionidae
Thysanoptera
Coleoptera
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Biological Sciences Publications
 
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