The recent continued wet weather has left the Creedy Park ground waterlogged and with no prospect of an improvement in conditions the decision has been taken to cancel both of the Group Two matches.
Each side will be awarded two points with Devon suffering their fifth washout in six matches in a frustrating and soggy start to their season.
Herefordshire will hope for better luck with the weather tomorrow when they face Cornwall at Werrington in another T20 double-header.
Devon are set to host Cornwall at Cornwood in their final group matches next Sunday, May 7... weather-permitting.
National Counties T20
fixtures - all matches free-to-see
Sunday April 30 (1100 and 1430)
Group One
Barrow: Cumbria v Northumberland, Leek: Staffordshire v Shropshire
Group Two
Milton Abbey School: Dorset v Cornwall.
Group Three
Woodhall Spa: Lincolnshire v Suffolk, Horsford: Norfolk v Hertfordshire.
Group Four
Wargrave: Berkshire v Bedfordshire, Lisvane: Wales NC v Buckinghamshire
Monday May 1 (11am and 2.30pm)
Group One
Nantwich: Cheshire v Staffordshire, Wem: Shropshire v Cumbria
Group Two
Werrington: Cornwall v Herefordshire, Warminster: Wiltshire v Dorset.
Group Three
March: Cambridgeshire v Lincolnshire, Ipswich School: Suffolk v Norfolk
Group Four
Ampthill: Bedfordshire v Wales NC, Thame: Oxfordshire v Berkshire.
