April 21 (Reuters) - Wall Street’s main indexes opened lower on Wednesday as Netflix kicked off quarterly earnings for technology behemoths with a disappointing report, while concerns about a surge in global coronavirus cases hit demand for equities. The Dow Jones Industrial Average fell 13.0 points, or 0.04%, at the open to 33808.3. The S&P 500 fell 6.5 points, or 0.16%, at the open to 4128.42, while the Nasdaq Composite dropped 40.5 points, or 0.29%, to 13745.772 at the opening bell. (Reporting by Devik Jain in Bengaluru; Editing by Anil D’Silva)