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Journal of Chemical Ecology

, Volume 15, Issue 4, pp 1379–1389 | Cite as

Crude extracts of asteraceous weeds

Growth inhibitors for variegated cutworm
  • G. S. Salloum
  • M. B. Isman
Article

Abstract

Petrol and ethanolic extracts of six asteraceous weeds were added to artificial diets to screen for growth inhibition and mortality of the variegated cutworm,Peridroma saucia (Hbn). Petrol and ethanolic extracts ofArtemisia tridentata andChamomilla suaveolens and ethanolic extracts ofChrysothamnus nauseosus andCentaurea diffusa severely inhibited larval growth at five times the natural concentrations. The twoC. suaveolens extracts and the ethanol extract ofA. tridentata were active at the natural concentration (100%) and were further examined at 20, 40, 60, and 80% of this level. Inhibition of larval growth was directly related to concentration for each of the three extracts tested. EC50s (effective concentration to inhibit growth by 50% relative to controls) for the three extracts were 36–42% of the naturally occurring level in the plants. Nutritional indices were calculated for secondinstarP. saucia feeding on the activeA. tridentata EtOH extract and the petrol extract fromC. suaveolens. Addition of the activeA. tridentata EtOH or theC. suaveolens petrol extract to the diet resulted in significant reduction in the relative growth rate of larvae, although theA. tridentata extract was much more inhibitory. Dietary utilization was significantly lower for larvae fed theA. tridentata EtOH extract.

Key words

Artemisia tridentata Chamomilla suaveolens Chrysothamnus nauseosus Peridroma saucia Lepidoptera Noctuidae growth inhibition plant extracts pest control 

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Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • G. S. Salloum
    • 1
  • M. B. Isman
    • 2
  1. 1.Safer Ltd.VictoriaCanada
  2. 2.Department of Plant ScienceUniversity of British ColumbiaVancouverCanada

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