  Let $T$ be a tree with an irreducible characteristic polynomial $\phi(x)$
over $\mathbb{Q}$. Let $\Delta(T)$ be the discriminant of $\phi(x)$. It is
proved that if $2^{-\frac n2}\sqrt{\Delta(T)}$ (which is always an integer) is
odd and square free, then every signed tree with underlying graph $T$ is
determined by its generalized spectrum.
