Please use this identifier to cite or link to this item: https://une.intersearch.com.au/unejspui/handle/1959.11/2993
Title: Performance and impact of the biological control agent 'Xubida infusella' (Lepidoptera; Pyralidae) on the target weed 'Eichhornia crassipes' (waterhyacinth) and on a non-target plant,'Pontederia cordata' (pickerelweed) in two nutrient regimes
Contributor(s): Stanley, John (author); Julien, Michael H (author); Center, Ted D (author)
Publication Date: 2007
DOI: 10.1016/j.biocontrol.2006.12.008
Handle Link: https://hdl.handle.net/1959.11/2993
Abstract: 'Xubida infusella' (Walker) (Lepidoptera: Pyralidae) is potentially a useful biological control agent targeting 'Eichhornia crassipes' (waterhyacinth) in the USA but many regions infested with waterhyasinth are also inhabited by an alternative native host, 'Pontederia cordata' (pickerelweed). Experiments were conducted in Australia to assess the impact of 'X. infusella' on pickerelweed compared to waterhyacinth where both these plants were available and 'X. infusella' had already been released. Overall 'X. infusella' had a greater impact on pickerelweed than on waterhyacinth. More than one larva per plant was required to reduce the total shoot dry weight of waterhyacinth but only one larva per plant reduced the total shoot dry weight of pickerelweed. Insect feeding caused the number of secondary shoots (daughter plants) of pickerelweed to double whereas the number of daughter plants produced by waterhyacinth remained unchanged. We suggest this indicates a considerable impact on pickerelweed rather than effective compensation for insect damage because the shoots produced were very small. Waterhyacinth produced a constant number of daughter plants when fed on by up to three larvae per plant. Hugher nitrogen status of both species of host plant increased the rate of larval development and pupal weight of 'X. infusella'. The weight and fecundity of 'X. infusella' reared on pickerelweed were lower than those reared on waterhyacinth but large numbers of progeny were produced on both plant species. This experiment demonstrates a considerable impact of 'X. infusella' on pickerelweed suggesting this plant is at risk from this agent if released in the USA where pickerelweed is present. The considerable impact on waterhyacinth demonstrates the potential for this insect to contribute to waterhyacinth control in countries where risk assessment favours release.
Publication Type: Journal Article
Source of Publication: Biological Control, 40(3), p. 298-305
Publisher: Academic Press
Place of Publication: United States
ISSN: 1049-9644
Field of Research (FOR): 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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Appears in Collections:Journal Article
School of Environmental and Rural Science

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