Strains
Until the 1970s, there was only one type of blight (A1) in the UK, and this was unable to produce resistant spores that could survive the winter. There are now two types (A1 and A2) which can mate and after that produce resistant spores, although the indications so far are that this rarely, if ever, happens in the UK. Mating can occur only between molds of different mating-types and is required for the production of resistant spores.
Read more about this topic: Phytophthora Infestans
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