A paddock-scale field trial comparing pastures of perennial ryegrass without endophyte (Nil) or infected with the selected endophytes AR1, AR37 or the standard endophyte (SE) sown with clover was monitored for insect pests over 3 years (2006-2008). Argentine stem weevil larval damage was reduced by all endophytes in each year.
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Popay et al. (2009) studied this question.
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