Samrong town police Gov. Noun Eth said the group became sick when they ate food that had been stored in metal bins that had previously contained pesticide for cassava trees.
"I went down immediately when it was reported that a lot of villagers had been poisoned. They were vomiting and had diarrhea after eating the food cooked by villagers," he said.
The cooks at the wedding party had not properly washed out the metal bins before storing meat and vegetables in them, The Phnom Penh Post reported Wednesday.
"We found the cause of poisoning to be careless hygiene because the tubs used to keep food for the wedding guests were not cleaned properly," Eth said.
The sick wedding guests were able to return home after treatment at the hospital, the newspaper said.