KIKUYU GRASS

I live in Los angeles county. A few years ago a strange grass began to invad my lawn and someone said it was kikuyu(sp). It laces the top of the lawn with long stron runners, up to four feet long and too strong to easily break. Well, I treated the lawn with Roundup and now have a Winter rye growing until later in the year when I install something permanent. My question: In some areas of the new grass there are bare spots where it will not grow. Does that former bad grass poison the soil in its area? If so, how can the poison be eliminated?
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