In this practical and data analysis activity students collect samples of leaves showing samples of infection with powdery mildew; the samples can be sent for analysis as part of the Powdery Mildew Survey citizen science project.

Students analyse data from the survey at the end of this activity.

Ideas about communicable diseases in plants are included in the updated programmes of study for Key Stage 4 science published in December 2014. These ideas will be included in GCSE Science courses from 2016 (for first assessment in summer 2018).