Trading activity came down sharply on the wholesale grain market on Thursday owing to traders' strike in the city against the extortion, dealers said. On rice sector Irri-6 Sindh dropped Rs 25 to Rs 3700-3800 in the absence of normal attendance due to shopkeepers strike, dealers said. On the seeds side cottonseed oilcake with bag Sindh was quoted at Rs 1100-1200 in process of trading, they said.