The Shijiazhuang Intermediate People's Court in north China's Hebei province began the trial of 39-year-old Lv Yueting, who was dissatisfied with his salary and working conditions and allegedly poisoned dumplings four years ago, state-run Xinhua news agency reported.
In January 2008, Japanese media reported that 10 people fell ill after consuming frozen meat dumplings produced by the Tianyang food plant based in Shijiazhuang, capital of Hebei.
But tests showed that the remaining dumplings from the same batch that was sent to Japan, as well as other batches produced by the company around the same time, were safe, according to Chinese quality inspectors.
In March 2010, suspect Lv, who worked in the factory between April 1993 and October 2009, was detained by Chinese police.
Lv confessed to have injected pesticide into frozen dumplings when he worked in the plant, the report quoted officials as saying.
Lv said he poisoned the dumplings because he was dissatisfied with his salary and did not get along with some of his co-workers, the procuratorate said.