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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. Black beetle numbers remained low in AR37, SE and AR1 pastures, except in the third year when numbers showed an upward trend in AR1 pastures. Nil pastures always contained the highest black beetle numbers, significantly higher than in AR37 and SE by the second year. The percentage of samples infested with root aphid was consistently the lowest in AR37 pastures with significantly more infestations in AR1 and Nil pastures by 2008, when overall levels were the highest. Grass grub numbers also increased annually with no significant difference between treatments. The results are consistent with AR37 pastures having the lowest insect pressure and this was reflected in their superior ryegrass tiller density which was maintained during the 2008 drought.

Endophyte effects on major insect pests in Waikato dairy pasture