Ryegrass production in Wairarapa, New Zealand: is biological control of Argentine stem weevil important?

McNeill, M.R.; Hume, D. E.; Ashby, Rachael; Ashby, Maurice; Brandon, P.; Guscott, P.; Tosswill, B.; Barton, R. K.

doi:10.33584/rps.13.2006.3148

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…Several previous studies in New Zealand have reported results of endophyte contamination testing, primarily for pastures grazed by dairy cattle. In general, contamination has been considered low and was primarily standard endophyte, and in some cases, increased over time (Faville et al, 2020; Hume & Barker, 2005; McNeill et al, 2007; Tozer et al, 2024; Ussher & Hume, 2015). As in the current study, there were a few pastures on commercial farms where standard endophyte contamination of the sown selected endophyte–ryegrasses was considerable, being in the range of 20%–50%.…”

Section: Discussionmentioning

confidence: 99%

Stability and purity of selected ryegrass Epichloë endophytes in New Zealand dairy pastures

Hume,

Luo,

Rennie

et al. 2024

Grassland Research

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BackgroundPerennial ryegrass (Lolium perenne) in New Zealand pastures is typically infected with the mutualist Epichloë fungal endophyte. This endophyte assists the plant in resisting biotic and abiotic stresses, but the standard strain of endophyte is toxic to livestock. Elite ryegrasses with selected endophytes have been developed to provide protective properties to the grass plant and lessen or eliminate the negative impacts on livestock.MethodsUsing immunology and molecular techniques, the presence of endophyte infection and endophyte strain in ryegrass tillers was determined for 24 dairy pastures sampled for up to 7 years in regions of the North and South Islands.ResultsIn general, infection levels were high and showed small increases over time. Some pastures failed to reach 70% infection. The sown, selected endophytes were the dominant endophyte strains present and these were stable over time. Standard endophyte was the primary nonsown endophyte, and while generally low and so of little importance, it increased over time and for some pastures, this would have been detrimental to livestock. Pasture establishment technique influenced the level of contamination.ConclusionsResults reinforce the importance of following best practice procedures in the seed industry and on‐farm. Researchers should monitor trials for contaminating nonsown standard endophyte.

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Section: Discussionmentioning

confidence: 99%

Stability and purity of selected ryegrass Epichloë endophytes in New Zealand dairy pastures

Hume,

Luo,

Rennie

et al. 2024

Grassland Research

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The current status of Argentine stem weevil (<i>Listronotus bonariensis</i>) as a pest in the North Island of New Zealand

Popay¹,

McNeill²,

Goldson³

et al. 2011

NZPP

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Recent sampling in Waikato and Taranaki shows that Argentine stem weevil (Listronotus bonariensis) can still cause major damage to susceptible ryegrass pastures despite the introduction of the parasitoid Microctonus hyperodae in 1991 Percentage of tillers with L bonariensis larval damage in diploid and tetraploid perennial ryegrass and Italian ryegrass in January and February were between 11 and 68 High egg numbers were noted on occasion Although there is evidence that M hyperodae reduces host populations parasitism levels vary considerably between years in Canterbury and are low in Otago and Southland where high populations of L bonariensis have recently been recorded Factors that may be lessening the impact of M hyperodae are considered These include asynchronous generations of the parasitoid and its host host behavioural adaptations compensatory oviposition and inhibition of flight in parasitised individuals leading to low levels of parasitism in new pastures

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Argentine stem weevil damage to high sugar ryegrass infected with AR1 under field conditions

Bryant¹,

Parsons²,

Rasmussen³

et al. 2008

ProNZG

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Ryegrass production in Wairarapa, New Zealand: is biological control of Argentine stem weevil important?

Cited by 4 publications

References 18 publications

Stability and purity of selected ryegrass Epichloë endophytes in New Zealand dairy pastures

Stability and purity of selected ryegrass Epichloë endophytes in New Zealand dairy pastures

The current status of Argentine stem weevil (<i>Listronotus bonariensis</i>) as a pest in the North Island of New Zealand

Argentine stem weevil damage to high sugar ryegrass infected with AR1 under field conditions

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