Question

Rootstock-scion incompatibility in fruit trees, which may take several years to manifest visibly, is most commonly first indicated in the field by which of the following symptoms?

A Immediate death of the grafted plant within a week
B Excessively vigorous growth of the scion with no other symptoms
C Complete absence of any growth from the rootstock
D An increase in fruit size beyond normal
E Bulging graft union with premature scion defoliation
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