Dairy Exporter December 2021

Page 84

RESEARCH WRAP WEEDS

Plants waiting to be weeds Words by: Elaine Fisher

A

84

GRAPH 1. How sleeper weeds turn into legacy weeds.

Legacy weeds

Detection

Land area invaded

bout 187 ‘legacy weed’ species occur in New Zealand’s pastures. Based on published information on 10 of these species, our legacy weeds cause at least $1.3 billion in loss of production on NZ’s pastoral farms each year, despite control practices. Others in a pool of more than 2000 naturalised and casual species are potentially ‘sleeper weeds’ poised to join their ranks. AgResearch’s key researchers in internal biosecurity, Graeme Bourdôt, Chris Buddenhagen and Shona Lamoureaux say there are 2841 introduced plant species that have either naturalised or are casual species in this country. Of the naturalised species, 187 species are common weeds in pastures and others will be ‘sleeper weeds’ and become a problem here in the future. With changing climate, changes in land management practices, and loss of herbicide products, there is potential for sleeper weeds to become widespread. The researchers say pastoral agriculture in NZ is uniquely vulnerable to weed invasions. NZ pastures are highly productive, but simple systems, comprised of a small number of imported non-native forage species While sustainable control of legacy weeds is important, there is an ever-present internal biosecurity risk of new weed problems from the pool of 2841 species. Research in the AgResearch Strategic Science Investment Fund weeds programme (Ministry for Business Innovation and Employment-funded) aims to deliver innovative solutions to

Sleeper weeds Exclusion

Containment

Eradication

Sustained control

Time

reduce the environmental footprint of weed control practices and maximise the biological and economic efficiency of pastoral farm systems. Novel models are being developed that can quantify the weed risk of each of the 2841 naturalised and casual plant species. The models utilise global information on the invasion history, climate preference and weed problem status of the species to assist their prioritisation as internal biosecurity threats to NZ. AgResearch is NZ’s leading independent provider of scientific research into agricultural weeds and their management. The CRI maintains a ‘weeds community of practice’ which involves five scientists (two in Hamilton and three in Lincoln) and

four technicians (three in Hamilton, one in Lincoln), students, and industry and university collaborators. The team’s long-term focus is on delivering to the ‘Pastoral sector weed research strategy’ co-designed by industry leaders and scientists from CRIs and universities. The AgResearch team has to date focused on addressing the three most highly ranked key issues in the strategy: internal biosecurity; alternatives to herbicides; herbicide resistance. • To find out more visit: https://www. agresearch.co.nz/assets/Uploads/ agresearch-pastoral-weeds-researchstrategy-2018-2031.pdf

Dairy Exporter | www.nzfarmlife.co.nz | December 2021


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Articles inside

The Dairy Exporter in December 1971

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pages 90-92

Gen Z to make their mark

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page 89

Tracmap unit eases compliance pain

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page 88

Never too late to learn

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pages 86-87

A beetle to beat the thistle

2min
page 85

Plants waiting to be weeds

2min
page 84

The art of saying no

5min
pages 82-83

Variety from consulting to composting

7min
pages 78-81

Vet Voice: More to it than

4min
pages 74-75

Fast track to management

5min
pages 76-77

Reducing heat stress over summer

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page 73

M. Bovis: It had a head start

6min
pages 71-72

Restoring Horowhenua’s waters

6min
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And now, freshwater plans

3min
page 64

Sustainability: Gaining the knowledge

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Open Country: Online tool for FEP

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When will all this end?

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Social media and anti-vax The dirty dozen

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How to handle Covid-19 coming onfarm

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No Jab, No Job in the milking shed

4min
page 48

It’s a health and safety issue

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Dealing with vaccine reluctance

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Taranaki soft core

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When the lights go red

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Prepare for a virus attack

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Ryegrass: Twelve years of torture

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Benchmarking: Measure it to be sure

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Ahuwhenua Trophy: Taking the leap to manager

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Spending the payout: new kit or cutting debt?

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Ahuwhenua Trophy: Quality on the coast

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Frances Coles loves being an ambassador for Kiwi farming

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Future farming will need to give more than profit, writes George Moss

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What a payout, writes John Milne, but what prices

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Market View: Hedging bets on Singapore

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Global Dairy: All change at FrieslandCampina

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