Journal of the Australian Entomological Society (1994) 33, 353-361

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R.K. Mensah and J.L. Madden (1994)
Life table and key factor studies of Ctenarytaina thysanura Ferris and Klyver (Hemiptera: Psyllidae) on Boronia megastigma Nees. ex Bartl. (Rutaceae) in Tasmania
Journal of the Australian Entomological Society 33 (4), 353-361
Abstract: The psyllid pest Ctenarytaina thysanura was studied intensively in Tasmania, Australia for nine generations from 1986 to 1989, and the identification and quantification of different mortality factors determined by key factor analysis. the analysis identified mortalities of late stage nymphs as key factors influencing C. thysanura populations. Simple graphical analysis suggested that the more predators and parasitoids there are per prey individual the higher the relative prey mortality and that predators and parasitoids acted as regulating agents at low psyllid densities but once the psyllid attained higher densities the negative feedback regulating effect is disengaged. The predators and parasitoids acted in a delayed density dependent manner with a negative feedback delay of two generations. In the absence of these agencies, through indiscriminate spraying, psyllid numbers increased significantly to be ultimately limited by an absence of the essential resource, the terminal shoot. Intraspecific competition for space and food during host plant deterioration resulted in reduction of size and emigration of adult psyllids.
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Database assignments for author(s): Robert K. Mensah

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
population dynamics/ epidemiology
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Ctenarytaina thysanura Boronia (genus) Australia (South+SE)
Coccinella transversalis (predator) Ctenarytaina thysanura Boronia (genus) Australia (South+SE)
Coccinella undecimpunctata (predator) Ctenarytaina thysanura Boronia (genus) Australia (South+SE)
Cleobora mellyi (predator) Ctenarytaina thysanura Boronia (genus) Australia (South+SE)
Harmonia conformis (predator) Ctenarytaina thysanura Boronia (genus) Australia (South+SE)
Linyphia triangularis (predator) Ctenarytaina thysanura Boronia (genus) Australia (South+SE)
Xysticus cristatus (predator) Ctenarytaina thysanura Boronia (genus) Australia (South+SE)