Equities in India put up their worst performance in 18 years in the quarter ended March as the new coronavirus pandemic upended economies worldwide and disrupted trade.The Nifty 50 Index slumped 29.3 percent in the period as India went into the world’s biggest lockdown to curb spreading of infection, shutting down businesses temporarily in an already slowing economy.The Nifty Midcap 100 and Nifty Smallcap 100 indices tumbled close to...