The Government's refusal to ban Chinese sky lanterns has angered farming organisations in the Westcountry.
The Country Land & Business Association (CLA) said the decision was based on an "inconclusive and unsatisfactory" report by the consultancy ADAS.
The report failed to recognise the "true scale of the threat posed by the fad," said the CLA. The £25,000 study rejected calls for a ban, claiming there was only anecdotal evidence the lanterns posed a threat to farm animals.
Now the CLA is calling on its members and the public to help collect evidence of the damage caused by lanterns. John Mortimer, South West regional director, said: "The Department for Environment, Food and Rural Affairs is under the impression that the main risk posed by sky lanterns is to aircraft. In fact there is plenty of evidence these flying bonfires are damaging property and crops and harming and killing cattle.
"Even the ADAS report concluded that 'the fire risk associated with the use of sky lanterns is significant', reported 16 cases of injury or death to cattle, sheep or horses and admitted there may be a 'significant level of under-reporting by veterinary surgeons and others'.
"Yet this inconclusive and unsatisfactory report still concluded the impact on livestock was very small."
The CLA was advising members to prevent people from using sky lanterns on their land.
Meanwhile the National Farmers' Union (NFU), the Women's Food and Farming Union and the Marine Conservation Society have joined forces to raise the issue once again.
NFU rural surveyor Louise Staples said: "Our members know how dangerous these lanterns can be. They can harm or kill farm animals by ingesting a wire frame in chopped grass and there is the fire risk to standing and stored crops, to buildings – and they can cause wild fires on moorland. We really hope people think twice about releasing them because of the very real dangers they pose."
Eunice Finney, vice president of the Women's Food and Farming Union, said: "These lanterns are far more dangerous than fireworks. We have warned there could be a death because politicians fail to act."
The Marine Conservation Society's head of conservation, Mike Cook, said: "Lanterns floating over the sea have been mistaken for distress flares. We have received reports of numerous false alarms for the Coastguard and RNLI. These mobile fireballs have to come down somewhere, and it's often on farmland or out at sea."