Apple Inc. /zigman2/quotes/202934861/composite AAPL +3.75% was planning to boost first-half production by 10% from a year ago but has received warning from some of its suppliers that the coronavirus outbreak could complicate those plans, according to a report from the Nikkei Asian Review on Tuesday. There is concern about manufacturing centers in the Henan, Guangdong, and Shanghai provinces as all have seen dozens of confirmed coronavirus cases, the report said. Apple had been asking suppliers to make up to 80 million iPhones in the first half of the year, mainly consisting of the new iPhone 11 family but also including some of a yet-to-be-release low-price model that some are expecting could come in March, according to the report. Apple didn't immediately respond to a MarketWatch request for comment. Its stock is up 1.1% in premarket trading Tuesday after dropping 2.9% in Monday's session amid coronavirus fears. Apple is due to report earnings after Tuesday's closing bell. Shares have gained 98% over the past 12 months, as the Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA +1.34% has risen 16%.