Septoria cornicola sporulates in tiny, pinpoint-sized fruiting bodies in the leaf spots. Spores are spread by wind and rain. The fungus overwinters in leaf debris.
Control ...
Twig infections occur when blossom or fruit infections continue to develop and extend down the stem into the twigs (Fig. 3). During wet weather the fungus may sporulate on infected twigs and may also girdle and kill them.
Fruit Infections ...
Because quince rust cankers continue to sporulate for several years, inoculum pressure tends to be more constant from year to year than for cedar-apple rust, which is influenced by infection conditions during the season two years earlier.
 See also: Spore, Fungicide, Produce, Infection, Fungus
  
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