Kroger KR.N, Best Buy BBY.N, Costco COST.O, Target TGT.N, TJX Companies TJX, Lululemon LULU.O and Home Depot HD.N slid between 2.5% and 5%. By Medha Singh July 26 (Reuters) - U.S. retailers tumbled on Tuesday after a forecast cut from industry bellwether Walmart Inc WMT.N stoked fears of similar warnings from a sector struggling with the impact of high inflation on consumer spending. Walmart's outlook provided "a diagnostic look at the average American household," showing that consumers are digesting higher prices of food and essentials by lowering spending on discretionary categories such as apparel, according to Jefferies analysts.