Phytophthora blight
with a light-green edge. On the stem, elongated brown lesions occur, usually circling the stem. On potato tubers, blueish lesions appear, that can be seen [...] new sporangiophores (structures containing sporangia, a type of spores) with sporangia are formed that protrude through the stomata. Secondary infection [...] the sporangia. For germination on above-ground plant parts, leaf wetness is required. Dispersal is by wind and rain causes the pathogen to be returned to