Abstract
SUMMARY. Reversion is characterised by four symptoms: “running off” of the fruit, unusual amount of lateral wood growth, sharp pointed leaves, long, thin, internodes. It is associated with and apparently caused by a check to the terminal growth through change of the terminal wood bud into: a big bud, a killed bud or blind bud, a fruit bud. It may also be associated with aphis attack. Mite resistant varieties revert under conditions 2 (6) and 2 (c). Seabrook's Black is mite resistant because in normal climates‐and seasons the mite kills the attacked growing point and thus starves itself. This only happens when both climate and variety favour an early and strong continued check to the, growth of the bush. There is a form of reversion occurring in young bushes before mite or aphis are present. This form is at present unaccountable.
Published Version
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