DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Pear scab infection. Light micrograph of a section through a pear (Pyrus sp.) infected with the Venturia pirinum fungus. This fungus causes scab, or black spot, of the pear fruit. The spores germinate and the hyphae penetrate the epidermis to form a mycelium (purple mesh), which enters the cells to reach the nutrients. Magnification: x70 when printed 10 centimetres wide.
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