HONG KONG, April 22 (Reuters) - Hong Kong shares slid further into the red on Wednesday afternoon, giving up more than 1.5 percent as the Shanghai market pulled back after its recent rally while HSBC dropped on caution over the results of stress tests at U.S. banks

By 0646 GMT (1446 hours) the benchmark Hang Seng Index was down 1.7 percent at 15,028.36.

The China Enterprises Index of top mainland companies was 1.6 percent lower at 8,890.91, tracking the 2.5 percent drop on the Shanghai Composite Index .

(Reporting by Parvathy Ullatil; Editing by Chris Lewis)