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. Though the forest risk zones are mapped and photographed by the satellite, nothing much is being done to curb these blazes. A study on the distribution of forest fires and controlling factors in the state conducted by the forestry and ecology division of the National Remote Sensing Agency with the help of Ohio State University revealed that Adilabad, Kadapa, Kurnool, Prakasham and Mahabubnagar had relatively highest number of fires compared to other areas. The study also revealed important bio-physical and socio-economic factors for assessing "forest fire dangers" in the state. Potential hot spots were also identified. A forest official said, "Dried leaves in the forests were burnt under controlled conditions to prevent accidental burning. Fire line operations have to be conducted in all potential areas. Teak wood, grass and bamboo forests are affected due to wild fires." Forest fires are also affecting the wild life habitat in these areas. Khammam district has 222 fire spots while Kadapa has 199 followed by 189 in Prakasam. Aizwal in Mizoram tops the country with 1,800 fire spots followed by Dantewada in Chhattisgarh and Koraput in Orissa. The experts said construction of watch towers, engaging fire fighters and taking the help of villagers in the adjoining areas will be a taken up as a part of control measures to fight the increasing fire problem in the state. Andhra Pradesh has 23 per cent of geographical area under forest and the leaf fall season starts in December. "February to May is the most dangerous period," the officials added.