After a weak opening, the scrip tumbled 19.99 per cent to Rs 65.85 -- its lower circuit limit -- on BSE.
On NSE, the shares plummeted 19.97 per cent to hit its lowest trading permissible limit for the day at Rs 66.10.
The stock had plunged 20 per cent in the previous session also, wiping out Rs 3,716.88 crore from its market valuation in two days.
Target Corporation is the second largest retailer in the US after Walmart and is a major customer for Welspun.
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"We refer to a product specification issue with one client programme of our subsidiary WGBL. We have initiated immediate actions to investigate the root cause. We are appointing an external auditor (one of the Big Four) to audit our supply systems and processes," Welspun India had said in BSE filing.
Target Corp said it has confirmed after an extensive investigation that Welspun, which uses Egyptian cotton to make bedsheets and pillowcases sold by the retailer, substituted another type of non-Egyptian cotton while producing these sheets between August 2014 and July 2016.