New Zealand Journal of Agricultural Research abstracts

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Activity of extracts and compounds from New Zealand gymnosperms against larvae of Lucilia cuprina (Diptera: Calliphoridae)

P. J. Gerard
L. D. Ruf

AgResearch
Ruakura Agricultural Research Centre
Private Bag 3123
Hamilton, New Zealand

S. D. Lorimer

New Zealand Crop & Food Research
Institute Ltd
University of Otago
P.O. Box 56
Dunedin, New Zealand

A. C. G. Heath

AgResearch
Wallaceville Animal Research Centre
P. O. Box 40063
Wallaceville, New Zealand

Abstract  A modified serum-based bioassay was used to screen plant extracts and assess compound activity against newly hatched larvae of the Australian sheep blowfly Lucilia cuprina. Larval instar mortality and physical appearance were recorded after exposure for 24 h to the treatments. Extracts from New Zealand gymnosperms shown to have activity against L. cuprina larvae were: Podocarpus totara; P. acuteafolius; Dacrycarpus dacrydioides; Halocarpus bidwillii; H. biformis; H. kirkii; Lagarostrobos colensoi; Lepidothamnus intermedius; L. laxifolius; Phyllocladus trichomanoides; P. glaucus, and Agathis australis. The phytoecdysones 20-hydroxyecdysone, 5,20-dihydroxyecdysone, and ponasterone A inhibited larval moulting. Dyshomoerythrine, dacrysterone, and nagilactone C were insecticidal, with the latter also retarding growth at sublethal rates.

Keywords  Lucilia cuprina; plant extracts; Gymnospermae; 20-hydroxyecdysone; 5,20-dihydroxyecdysone; ponasterone; nagilactone; dacrysterone; dyshomoerythrine

New Zealand Journal of Agricultural Research, 1997, Vol. 40: 261-267

0028-8233/97/4002-0261 $7.00/0 (c) The Royal Society of New Zealand 1997

PDF file of entire paper: medium quality (1243K); (scanned from paper original: notes about this process)

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