In a move that could further push up Onion prices, traders in Nashik and adjoining areas on Monday went on two-day strike against tax raids. They also disrupted supply to contracting traders from other states who are being forced to sell the vegetable at below the cost price. This has virtually halted the supply of the onion from Nashik and Lasalgaon, Asia's biggest onion market. The retail price of onion, which is ruling at 55 to 60 rupees per kg in metros, is expected to shoot up further in next few days in the wake of a short supply due to the strike. Onion traders in Nashik, Lasalgoan and Pimpalgoan are on strike for two days because the contracting traders from states like Delhi and Kolkata have asked them not to supply. Traders are protesting on fears of losses as onion, being a perishable commodity, cannot be stored if traders from neighbouring states continue to stop buying.