New Delhi, 18 April (NNS): There is a swamp of downtrend in the prices of cumin due to the all-round selling from the speculators in the contract during the last week. The cumin which was being sold at Rs 260/265 per kg during the last two days, now, it is ruling at Rs 250/255 per kg. The export showed downfall from the Unjha line due to the feeble prices of cumin in the international markets.