Table 1.

Field trial site description and sample dates.

Site	Taieri Plain (lowland pasture site)	East Otago Plateau (tussock grassland site)
Altitude above sea level	20 m	900 m
Mean annual rainfall	684 mm	630 mm
Soil type	Wingatui silt loam	Teviot silt loam
Vegetation	pasture	Chionochloa rigida grassland
Site prepared	Jan 2012	Dec 2011
Tussocks planted	3 Apr 2012	8 Mar 2012
L. bonariensis adults added	7 Dec 2013	12 Dec 2013
Tiller samples taken for eggs and larvae	15 Jan 2013	1 Feb 2013
Plants excavated	27 Mar 2013	2 May 2013