Cornwall Trading Standards has issued a warning to homeowners following reports of cold callers using aggressive sales tactics, and overcharging customers.
A group of men claiming to be tree surgeons called at a property in Newquay and quoted £140 for work on a tree, which was then hastily reduced to £40 when the resident said she was unable to pay.
The resident described the state of the tree as "hacked to pieces" when the men left.
The suspected scammers also failed to provide her with either the required paperwork, or her legally required 14 day cooling off period.
In another unrelated incident, a man was arrested in Hayle last week following a report of bogus landscaping work.
Devon and Cornwall Police were alerted to reports of two men believed to have carried out work throughout Cornwall, who quoted over £3000 to lay gravel and fix a door at the home of an elderly female.
Their high prices and aggressive sales tactics resulted in an arrest.
One of the men was later interviewed by Cornwall Trading Standards and bailed whilst investigations continue.
Trading Standards urge everyone to be on their guard when it comes to traders knocking on your door trying to gain work.
Residents are advised to obtain several quotes, and never to part with cash on the doorstep.
Allan Hampshire, Cornwall Council's Head of Public Protection and Business Support, said: "Cornwall seems to be particularly targeted by every fraudster, con-man, scammer and doorstep criminal at the moment.
"As much as my officers are trying to catch these crooks and bring them to account we are keen to ensure that no-one else becomes a victim. Our advice is simple: never deal with anyone who turns up at your door without an appointment, and never pay money to anyone who calls you on the phone. If you do need work doing on your home, always obtain more than one quote and only deal with firms you know."
If anyone has any concerns they should contact Cornwall Council Trading Standards on 0300 1234 19, contact Devon and Cornwall Police on 101 or in an emergency dial 999 and speak to the Police.