A "citizen science" outreach program was aimed at high school students in Western Australia with a focus on agricultural sciences. The program had two main objectives: the collection of samples and the mapping of the distribution of the leaf disease powdery mildew of barley across the state; and support for the teaching and learning of agricultural science. Nearly one thousand students participated in the Mildew Mania intervention that involved class experimental work for a Curtin University GRDC-funded project and interactions with scientists visiting schools. Alongside this, data was collected about attitudes towards agricultural science. Following the intervention, a moderate effect size (0.45) is reported for students wanting to learn more about investigative work on agricultural issues. Attitudinal data showed a negative correlation of interest in agriculture with the Index of Community Socio-Economical Advantage (ICSEA), and an increase in interest in careers in agriculture with older students. Limitations are the constraints in gaining appropriate permissions and consent for all parties to use survey data.