New Zealand Journal of Agricultural Research abstracts

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Extraction of small larvae of Wiseana spp. (Lepidoptera: Hepialidae) from pasture samples by high temperature gradient funnel

K. M. STEWART

Invermay Agricultural Centre
Private Bag 50034
Mosgiel, New Zealand

Present address: Department of Biological Sciences, The David Attenborough Laboratories, De Montfort University, Scraptoft, Leicester LE7 9SU, England.

Abstract  A high-gradient heat extraction apparatus for extracting porina (Wiseana spp.) larvae of less than 10 mm long from cores of pasture soil is described. Extraction by heat was more effective and faster than by soil-washing, the only other practicable method. Of the larvae which were extracted from cores 15 mm deep, 77% emerged within 2 h and 96% within 5 h. The speed of extraction was not affected by moisture content of the cores but it was slightly reduced if deeper cores were used.

Keywords  Tullgren funnel; heat extractor; Wiseana; Hepialidae; Lepidoptera; porina; pasture pest; sampling

New Zealand Journal of Agricultural Research, 1995, Vol. 38: 407-412

0028-8233/95/3803-0407 $2.50/0 (c) The Royal Society of New Zealand 1995

PDF file of entire paper: medium quality (357K); (scanned from paper original: notes about this process)

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