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Hundreds of Australians diagnosed with cancer are fighting in court to prove their disease stemmed from a component of a widely used weed killer.

The landmark class action, launched by Maurice Blackburn Lawyers on behalf of more than 800 non-Hodgkin lymphoma patients, alleges a component in the popular Roundup herbicide called glyphosate caused their disease.

Many of the people who have joined the class action used Roundup as part of their work, Maurice Blackburn national head of class actions Andrew Watson said.

The lead applicant in the Federal Court of Australia case, 40-year-old Queensland man Kelvin McNickle, allegedly used Roundup as a child while spraying weeds with his father and then during his adulthood through his work.

Mr McNickle was first diagnosed with non-Hodgkin lymphoma in May 2018 and underwent chemotherapy and radiotherapy for about seven months.

Not long after, doctors told him he was in remission.

Six weeks ago he was again diagnosed with the disease.

"We cover a gamut of ordinary Australians who have developed non-Hodgkin lymphoma through their exposure to Roundup," Mr Watson told reporters on Monday.

Federal Court proceedings that began on Monday are slated to run for nine weeks and determine whether Roundup contains a carcinogen before other issues in the case are dealt with.

The civil action has been launched against Monsanto, which produced the weed killer. Bayer acquired Monsanto in 2018.

Mr McNickle will not attend the hearing while he receives cancer treatment.

"The upshot is, we are confident that Monsanto did everything it could to avoid confronting the reality that this chemical was a carcinogen and did everything it could to obscure the science and to hide the science," Mr Watson said.

Roundup is still used in Australia and the Australian Pesticides and Veterinary Medicines Authority supports the company's claim glyphosate-based herbicides are not carcinogenic.

Bayer says glyphosate-based herbicides have been rigorously tested in hundreds of studies, and the weight of that extensive body of science confirms that glyphosate is safe when used as directed.

"Monsanto's defence of the claim demonstrates Bayer's ongoing commitment to supporting Australian farmers by ensuring innovative products such as Roundup continue to be available, advancing sustainable agriculture and protecting food security," it said in a statement.

The Federal Court case is expected to come down to the science behind glyphosate.

Barrister Andrew Clements KC, representing Mr McNickle, on Monday laid out three streams of evidence they will rely on to prove glyphosate and glyphosate-based formulations are carcinogenic: epidemiological evidence, mechanistic evidence and animal studies evidence.

"The greater the duration and intensity of exposure to Roundup Herbicide and Roundup Biactive, the greater the increase in the exposed individual's risk of developing non-Hodgkin lymphoma," lawyers said.

Mr Clements pointed to several studies over the decades that he said supported the claim glyphosate was carcinogenic.

He criticised Monsanto for consistently working to discredit every study that raised concerns about the ingredient.

"It's the same old approach: ignore the smoke, there's no fire here," Mr Clements told the court.

Barrister Steven Finch SC, representing Monsanto, said Maurice Blackburn's own experts disproved their claims.

They were also wrong to suggest they could rely on one of their three streams of evidence to prove their case if two of the streams failed, he said.

"We make no apology at all for making the majority of our attack on the reliability of the studies presented to Your Honour," Mr Finch told Judge Michael Lee.

The hearing continues.

© AAP 2023

Cattle are on the run and a truck driver has suffered minor injuries after his rig crashed into a house in South Australia's mid-north.

The incident occurred early on Monday morning in Ludgvan Street in Burra.

The truck hit the front verandah of the property with the 43-year-old driver taken to the Burra Hospital with minor injuries.

Police say many of the cattle on board escaped and are roaming the area.

They have urged motorists to take care with concerns the animals may be distressed.

Other cows injuries in the crash will be euthanised at the scene.

The road is expected to remain closed for several hours while the scene is cleared and a heavy vehicle tow truck brought in.

© AAP 2023

An unusual late-summer storm has turned a week-long counterculture festival into a sloppy mess with tens of thousands of partygoers stuck in foot-deep mud and with no working toilets in the northern Nevada desert.

The annual gathering in the Black Rock Desert north of Reno attracts nearly 80,000 artists, musicians and activists for a mix of wilderness camping and avant-garde performances.

More than 1cm of rain fell at the festival site on Friday, the National Weather Service in Reno said, with more coming on Saturday and Sunday.

Organisers closed the festival to vehicles after one death was reported. Officials provided no details of the fatality.

The closures came just before a large wooden effigy was supposed to have been burned on Saturday night. Organisers said that all burning had been postponed, and authorities were working to open exit routes by the end of the Labor Day weekend.

Officials said late on Saturday they didn't yet know when the roads would "be dry enough for RVs or vehicles to navigate safely", but they were hopeful vehicles could depart by late Monday if weather conditions improved.

US President Joe Biden told reporters in Delaware on Sunday he is aware of the situation, including the death, and the White House is in touch with local officials.

With their party closed to motorised traffic, attendees trudged through mud, many barefoot or with plastic bags on their feet. Revellers were urged to conserve supplies of food and water and most remained hunkered down at the site.

A few, however, managed to walk several kilometres to the nearest town or catch a ride there.

DJ Diplo posted a video to Instagram on Saturday evening showing him and comedian Chris Rock riding in the back of a fan's ute. He said they had walked nearly 10km through the mud before hitching a ride.

"I legit walked the side of the road for hours with my thumb out," wrote Diplo, whose real name is Thomas Wesley Pentz.

© AP 2023