Farmer Zhang She uses a wasp species as a biological control agent in his sunflower field in Wuyuan County, north China's Inner Mongolia Autonomous Region, Aug. 23, 2018. Wuyuan County authorities have expedited industrial upgrades for local sunflower seed enterprises by encouraging export-oriented businesses and standardized planting. The local sunflower seed products are now sold to markets in Europe, North America and the Middle East. (Photo: Xinhua)

A worker conducts quality control at a sunflower seed company in Wuyuan County, north China's Inner Mongolia Autonomous Region, May 9, 2018. Wuyuan County authorities have expedited industrial upgrades for local sunflower seed enterprises by encouraging export-oriented businesses and standardized planting. The local sunflower seed products are now sold to markets in Europe, North America and the Middle East.  (Photo: Xinhua)

Farmer Zhang Zhonggui poses for photos in his sunflower field in Wuyuan County, north China's Inner Mongolia Autonomous Region, Aug. 23, 2018. Wuyuan County authorities have expedited industrial upgrades for local sunflower seed enterprises by encouraging export-oriented businesses and standardized planting. The local sunflower seed products are now sold to markets in Europe, North America and the Middle East. (Photo: Xinhua)

A worker processes sunflower seeds at a factory in Wuyuan County, north China's Inner Mongolia Autonomous Region, Aug. 23, 2018. Wuyuan County authorities have expedited industrial upgrades for local sunflower seed enterprises by encouraging export-oriented businesses and standardized planting. The local sunflower seed products are now sold to markets in Europe, North America and the Middle East.  (Photo: Xinhua)