The deterministic position control of an individual single photon emitter relative to (nanostructured) matter is a central requirement to allow the systematic study of the fundamentals of light-matter interaction. Besides its relevance for basic research the implications for technological applications are manifold. Here, we study the controlled coupling of nanoscale fluorescent semiconducting quantum dots (QDs) to gold and silver nanowires. These wires support propagating surface plasmons (SPs), i.e. free electron oscillations at a metal-dielectric interface coupled to a bound light field. In contrast to light modes in dielectric materials, SPs can be squeezed to subdiffraction volumes, enabling highly confined light guiding. Furthermore, the strong lateral electromagnetic field confinement to nanometer dimensions along the wire enables an effective coupling to nearby deposited QDs. However, damping in the metal restricts SP propagation to distances of a few micrometers, which is a quite important limitation.With a lithographic fabrication process we precisely align QDs at predefined positions relative to silver nanowires with cross sections of a few tens of nanometers and micrometer lengths. By characterizing single hybrid structures, both the excitation of propagating nanowire SPs by QDs and the excitation (addressing) of QDs by SPs is demonstrated. The experiments reveal that the QD fluorescence is strongly modified by the additional plasmonic decay channel provided by the nanowire. We experimentally observe standing SP wave signatures of the nanowire in the QD fluorescence spectrum and a significant increase of the fluorescence decay rate. We furthermore accomplish the coupling of two spectrally distinct QDs (donor and acceptor) to the two ends of a nanowire and observe plasmon-mediated energy transfer over micrometer distances from donor to acceptor QDs.