Marketmen attributed fall in guargum prices to profit-booking by speculators at existing levels.
Furthermore, increased arrivals and slackness in demand in physical markets too weighed on guargum futures, they said.
At the National Commodity and Derivative Exchange, guargum for delivery in October month was trading Rs 130, or 1.65 per cent, down at Rs 7,750 per quintal, in an open interest of 16,647 lots.
Also, guargum for November month delivery fell Rs 129, or 1.62 per cent to Rs 7,891 per quintal, with an open interest of 6,280 lots.