Hyderabad, July 20: Forest fire causes major disaster to the vegetation in the state. Forest fires amount to 13.53 per cent of total blazes in the country. After Mizoram and Orissa, Andhra Pradesh has the largest number of fire spots according to the ministry of environment and forest department. Khammam, Kadapa and Prakasam figure in the list of top 30 districts with the highest number of fire incidents.