Lincolnshire has joined several counties in the east of the country hit by Blue Tongue restrictions.
The disease, mainly spread by midges, affects sheep, cattle, ruminants including deer and goats and camelids such as llamas and alpacas. It does not affect people or food safety and movement restrictions are in place to control the spread of the disease.
Anyone keeping livestock is being asked to look for symptoms, which are often more likely to be apparent in sheep.
The symptoms include ulcers or sores in the mouth and nose; discharge from the eyes or nose and drooling. The lips, tongue, head and neck can also swell along with the coronary band (where the skin of the leg meets the horn of the foot).