  We study open and closed string interactions in the Type IIB plane wave
background using open+closed string field theory. We reproduce all string
amplitudes from the dual N=2 Sp(N) gauge theory by computing matrix elements of
the dilatation operator. A direct diagrammatic correspondence is found between
string theory and gauge theory Feynman diagrams. The prefactor and Neumann
matrices of open+closed string field theory are separately realized in terms of
gauge theory quantities.
