How potato blight spread in Ireland 1845?

Potato blight in Ireland in 1845 was caused by the pathogen Phytophthora infestans, which thrived in the damp, cool conditions of that summer. The disease spread rapidly through contaminated seed potatoes and the movement of infected plants. It devastated potato crops, which were a staple food for the Irish population, leading to widespread famine and suffering. The blight's impact was exacerbated by the reliance on a single potato variety, making the crop particularly vulnerable to disease.