Police are investigating the theft of 1,000-litres of a rare chemical from an Angus farm.
The fungicidal spray, which was stored in 10-litres containers, was taken from a storage shed on the property at Colliston, near Arbroath.
The chemical is no longer available to buy in the UK, making it more valuable.
Police believe the theft is linked to similar incidents which have taken place across the north-east in recent times.
The “high value” chemicals were taken between Sunday at 11pm and Monday at 7am.
The force added that the spray cannot be mixed with other chemicals to create other compounds and that the theft is “not linked to any other type of crime”.
A statement from Tayside Police Division reads: “Police Scotland is appealing for information about a high-value theft from a farm at Colliston near Arbroath, which happened between 11pm on Sunday, August 4 and 7am Monday, August 5.
“A storage shed was broken into, and 1,000 litres of fungicidal spray were taken. This particular chemical is no longer commercially available in the UK and is quite valuable as a result.
“The spray was contained in 10 litre containers, so a vehicle was more than likely used to take them away.
“It should be noted that it is used purely as an agricultural fungicide and is not something that can be used to make other chemical compounds, so we are satisfied that this is a theft and not linked to any other type of crime.
“We are aware that there have been other similar thefts at farms in the north-east of Scotland in the past couple of weeks, and they may well be linked.
“As a consequence, we would like to ask farmers to check on the security of their storage sheds and compounds, particularly chemical stores, and should they see any persons acting suspiciously around them to call us immediately.
“If you have any information that could assist our enquiries, please call 101 or speak with any police officer.
“Also, information can be given anonymously through Crimestoppers on 0800 555 111. Our reference is CR/20447/19.”
