Are public and private standards affecting farmer knowledge and moving farm practices toward food safety and environmental sustainability in China? We surveyed a total of 355 apple farmers, involved in chains supplying a diversity of retailing points, including supermarkets. Using a multivariate regression model, we find no measurable evidence that the certification schemes of farm bases and agribusiness companies lead to improved apple growers' knowledge regarding pest and disease management. The behavioral changes were mainly prompted by delegated decision-making towards farm bases, which raises questions on the long-term changes in farmers' practices.