Abstract
SUMMARYProblems of potato culture are discussed with respect to photosensitivity, seed stock degeneration, and the maturity behaviour of varieties bred in the temperate world. Varieties adapted to temperate climates, when grown under sub-tropical conditions, matured earlier and yielded less than when grown under temperate conditions. The complex problems involved in combining several desirable attributes in a variety are discussed in the light of current breeding procedures and new approaches to solve several of the problems are indicated. Data on the bionomics of aphid vectors of potato viruses suggest methods for maintaining high health standards in breeders' stocks. Techniques are discussed for raising large populations of seedlings from true seeds under sub-tropical conditions.
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