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.
Cornwall man handed warning for disturbing dolphins
He encouraged others to do the same
10-storey Exeter student accomodation block planned
Developer wants to demolish old JobCentre
Former nightclub could become student accommodation
180 studio apartments planned for Unit 1
North Devon drug dealer jailed
He used an encrypted app to carry out his business
Investigation launched into glasses theft
More than 30 pairs have been taken
Controversial mega site for 700 Exmouth homes approved
Residents 'gutted'
