increase font size
AgResearch senior scientist Trevor James.
Herbicide resistance is emerging as a serious and growing threat to New Zealand's food production, with recent surveys by scientists finding half or more of arable farms in some regions have weeds resistant to commonly and used herbicides.
AgResearch scientists, who are carrying out the first systematic approach to surveying for herbicide-resistant weeds in arable crops with funding from the Ministry of Business, Innovation and Employement, say the results they are seeing are often many times the levels of resistance that had been expected.
In additionm new resistant weed species are also being brought forward, or discovered by the AgResearch scientists working alongside the Foundation for Arable Research (FAR) and the Bragato Research Institute, as part of the Managing Herbicide Resistance programme which began in 2018.
Herbicide-resistant weeds were first detected in New Zealand in 1979, but until recently reporting of herbicide resistance has largely been ad hoc and left to growers and rural professionals to recognise and alert researchers.
AgResearch senior scientist Dr Trevor James, who spoke last week at the NZ Plant Protection Society's annual conference in Napier, says the survey findings are a wake-up call and should be focusing efforts to manage the threat of herbicide resistance.
"The issue is that as this resistance grows, so too does the costs and impacts on farmers and crop production in New Zealand.
"We firstly need to understand the full scope of the problem across New Zealand, the mechanisms involved in the resistance, how the resistance is passed through the generations of these plants, and then we need to look at strategies to address it and slow the development of the resistance," James says.
"At present, there are limited alternatives to many of these herbicides that the weeds are evolving resistance to, and that is an area that also deserves attention and investment in the research."
In 2019, a survey took seeds from 48 randomly selected arable farms in central Canterbury and weeds resistant to Group A and B herbicides were identified from a quarter of those farms.
Further surveying across arable farms in Southland, Waikato and Bay of Plenty found at least 50% had weeds resistant to Group A and/or B herbicides, with glyphosate being a problem in vineyards. The highest risk weeds were pasture-related grasses.
Common resistant weed species being identified by the researchers include ryegrass, wild oats and chickweed, as well as first time finds of resistant sow thistle (puha), summer grass, prairie grass and lesser canary grass.
An innovative idea for transforming mechanically deboned meat (MDM) into a meat flake for seasoning has taken top honours in the Meat Industry Association’s (MIA) first-ever Dragon’s Den competition.
The Government's plan to merge the seven crown institutes presents exciting possibilities for plant technology company Grasslanz Technology, says chief executive Megan Skiffington.
AgResearch scientists have collected the first known data showing behavioural developmental impacts on lambs whose mothers were treated with long-acting drugs for parasites.
Primary sector groups appear to be generally supportive of the Gene Technology Bill currently before parliamentarians.
There's been very little reaction to the government science reform announcement, with many saying the devil will be in the detail.
Trade and Agriculture Minister Todd McClay says New Zealand's trade interests are best served in a world where trade flows freely.
New Zealand's red meat sector says it is disappointed by the United States' decision to impose tariffs on New Zealand exports.
OPINION: Farmers nationwide will be rubbing their hands with glee at the latest news from the Government about the RMA reforms.
Holstein Friesian NZ and Link Livestock have agreed on a strategic partnership to provide HFNZ members with comprehensive services from one of New Zealand's most respected dairy men.
Rural retailer Farmlands has launched a new casual clothing range available across 42 stores nationwide and through its online store.
Federated Farmers says the health and safety changes announced this week by the Government represent the start of overdue reforms.
OPINION: Is it the beginning of the end for Greenpeace?
OPINION: The good times felt across the dairy sector weren't lost at last week's Beef + Lamb NZ annual meeting.
