CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY
Leaf infected with potato blight, coloured scanning electron micrograph (SEM). Lower surface of a leaf from a potato plant infected with late blight, showing a hyphal thread (white) terminating in a sporangium (round). The sporangium is where the mould's spores are produced and released from. Late blight is caused by the water mould Phytophthora infestans. The spores of the mould lie dormant on tubers under the soil during the winter, but spread rapidly in warmer damp conditions. The infection ultimately leads to the collapse of the whole plant.
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