For the best experience, please enable JavaScript in your browser settings. Farmers weed a field of Upland rice in Rongo, Migori County. (Photo: Stanley Ongwae ...

Working with partners in China, Malaysia and Thailand, biologists in Arts & Sciences at Washington University in St. Louis determined that weedy rice is crossbreeding with wild rice in Southeast Asia.

This rice is a cross between varieties of high-yielding Asian rice and the robust and disease-resistant African rice. Nearly 20 million hectares of the world’s rice growing areas are planted to upland ...