This study explores the impact of climate change on biological control of the Woolly apple aphid (Eriosoma lanigerum, WAA) by its parasitoid Aphelinus mali. Changes in temperature affect the survival and development of A. mali, potentially influencing its effectiveness in controlling WAA populations. The study shows that temperature variations impact the survival and development of A. mali. While warmer conditions enhance parasitism rates, factors like extreme heat events and host population changes may counteract the positive effects. Highlighting the complex dynamics of climate change on insect pest control and emphasizing the need for a nuanced understanding of how climate change affects pest management strategies.