The fires have been on farmland in areas around Newton Abbot, Teignmouth, Paignton and Dawlish.
All the incidents involved a number of fire crews attending the scenes for long periods of time.
Safety advice has now been issued to farmers on how to reduce the risk of arson, including preventing easy access and installing security.
Conservatives' 16 year Devon leadership reign ends
They're now the third biggest party in the county
Labour loses all county council seats in Exeter
Reform and Greens sweep them aside
Devoncast – Plymouth recovers, Exeter includes and a jewel in the crown for Torquay
Plus - the Devon County Show
Reform take Exeter City Council seat
Labour hold the other city seat up for grabs
Devon therapy sheep found following appeal
Bertha is back home
Underspent grant could benefit Exeter Airport
The majority of a £230,000 grant rolled over
