Pyricularia oryzae

Blast disease of rice. This is probably the most damaging disease of rice, causing a seedling blight, leaf blight, and neck rot. There is an urgent need for work on horizontal resistance, but this is difficult as vertical resistance complicate the situation, particularly as some of them are apparently quantitative vertical resistances. Pyrus communis

The pear, which is one of the pome fruits. Pears and apples are antique fruits, and both Homer and Pliny the Elder recorded the names of ancient cultivars of each. Pears are easy to breed but amateur breeders should be aware of the fairly extreme difficulties associated with establishing a new cultivar. Pythium

A genus of the downy mildews (Peronosporales). Some species cause stem and root rots, as well as damping-off of seedlings.

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