All crop improvement activities ultimately depend on good phenotyping. With the qualitative and quantitative description of plant growth and development, crop researchers are able to isolate improved plant lines. In addition to manual ground phenotyping, CASS researchers from the Forschungszentrum Jülich (https://www.fz-juelich.de/ibg/ibg-2/EN/Staff/Shoot_Dynamics/Muller_Onno/Muller.html?nn=1454730) use unmanned aerial vehicles (UAV) to study cassava growth during open-field trials. UAV-based measurements enables cost efficient, frequent quantification of above-ground plant growth of large planting areas. In the frame of the CASS project, Dr. Anna van Doorn (left) studies cassava growth on various fields in Nigeria and Taiwan and thereby contributes to our efforts towards improving cassava genotypes. Recently, she used her drone to record a video of our harvesting activities that concluded the first open-field trial with source-sink altered cassava plants