Growth of the eight core industries in September plunged to 1.9 per cent, the slowest pace in eight months, against 9 per cent in the same month last year, due to fall in output of crude oil, natural gas, refinery products and fertiliser.According to the data released by Commerce and Industry Ministry, crude oil, natural gas, refinery products and fertiliser output have registered a drop of 1.1 per cent, 6.2 per cent,2.5 per cent and 11.6 per cent respectively in the month under review.Expansion in other four sectors – coal, cement, steel and electricity – too slowed down to 7.2 per cent, 3.2 per cent, 4per cent and 3.8 per cent respectively in September this year against the same month last year.During April-September, the eight sectors grew by 4 percent, against 5 per cent in the year-ago period.The September figures would have impact on overall industrial production as the eight core sectors have a combined weight of about 38 per cent in the Index of Industrial Production.