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.
Pothole damage claim for every seven miles of road
Nearly 1,200 claims against council
Earlier kick-off for Devon derby
Match will get underway at 12.30
Exeter Dryden Road consultation reopens
The deadline for responses has been extended
Devon teenager charged after Somerset stabbing
Man attacked on street
Two Plymouth towns set for major boost
Residents to call the shots
Could more Dartmoor car parks charge prices?
There are only a small number at present
