How do we get rid of lespedeza that has invaded our suburban zoysia lawn? The lespedeza comes every summer. Nothing we have ever used gets rid of it, except pulling it out by the roots. That isn't feasible, considering the large part of the lawn that is covered with zoysia.
I would suggest you contact your local extension office (found under gov't in your phone book). They will be able to help you chose appropriate controls to help solve your problem.