Inflation rose to its highest level this fiscal at 7.81 per cent in September as prices of wheat, cereals and diesel soared. Inflation, as measured by the Wholesale Price Index (WPI), was 7.55 per cent in August. In the food articles category, wheat turned expensive by 18.63 per cent, up from 12.85 per cent in August. Cereals too became dearer by 14.18 per cent, from 10.7 per cent in the previous month.Inflation in diesel shot up to 8.94 per cent during the month, from 0.36 per cent, following government raising prices of the petro-product by over Rs 5 per litre on September 13.For the fuel and power category, inflation surged 11.88 per cent from 8.32 per cent. Besides diesel, aviation turbine fuel and kerosene became expensive.