Fig. 3. Probability that a GU will become floral, according to axis type on ‘Fuji’ and ‘Braeburn’ apple trees. The probability of the GU belonging to a long shoot or brindle was considered according to shoot age (A) and tree age (B), while that of the GU belonging to spurs was considered according to tree age only (C). O2, Order 2; O3, order 3; O4, order 4.