We will present in this talk propagation properties for the solutions of the heterogeneous Fisher-KPP equation $$\partial_{t} u - \partial_{xx}u=\mu (t,x) u(1-u)$$ where $\mu$ is only assumed to be uniformly continuous and bounded in $(t,x)$, for initial data with compact support. Using homogenization techniques, we construct two speeds $\overline{w}$ and $\underline{w}$ such that
$\lim_{t\to+\infty}u(t,x+wt) = 0$ if $w>\overline{w}$ and $\lim_{t\to+\infty} u(t,x+wt)=1$ if $w
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