Witchweed with Crops (IMAGE) Penn State Caption The parasitic plant witchweed, which has bright flowers, has a variety of hosts, including the important cereal crop sorghum. A new study reveals that sorghum plants where witchweed is most prevalent are locally adapted to deal with the parasite by having a mutation in the LGS1 gene. Credit S.M. Runo, Kenyatta University Usage Restrictions Credit must be provided alongside image. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.