The stocks nosedived in Hong Kong today as the Hang Seng Index erased this year’s gains. The stocks fell as commodity producers slipped on lower oil prices and reports emerged that higher interest rates by China slow economic growth. Nation’s largest oil producer, PetroChina Co., shed 3 percent after announcing an asset purchase, while China Overseas Land & Investment Ltd., which is run by the nation’s construction ministry, went down 3.6 percent after Beijing raised interest rates on February 8.