<![CDATA[Biology learning in Kotapinang State Senior High School heavily relies on conventional textbooks that lack local context, creating a gap between curriculum content and the students' plantation environment. While applied mycological studies on local oil palm pathogens exist, their integration into high school biology media remains unexplored. This study aims to bridge this gap by developing an innovative pocket book on macroscopic pathogenic fungi based on authentic local research. Utilizing the Research and Development (R&D) approach with the 4D model (limited to the Develop stage), the prototype underwent rigorous validation by material, learning, and design experts. Practicality was assessed by biology teachers, followed by a small-scale trial involving 15 grade 11 students selected via random sampling. The trial procedure required students to review the pocket book’s readability and layout through guided skimming, after which their user experience was evaluated using a structured practicality questionnaire. Expert validation results ranged from 85.88% to 96.36%, indicating very high validity. The practitioner assessment yielded a highly positive response (100%), while the student evaluation achieved 85.74%, placing it in the very practical category. This product has the potential to contextualize biology learning by integrating local research findings, serving as a suitable way to provide contextual supplementary learning materials in schools based in plantation areas.]]>
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