When i seed in the spring i use tupersan selective pre-em. Also doesn't cause and chemical root pruning like most pre emergents.
On a side note riggle
Why do you suppose it is hard to find a pre emergent with much if any phosphorus. P is supposed to make the roots develop and during the fall and spring that is actively taking place for fescue while soil temps are below 70. Most pre ems cause root pruning and it seems that p would offset the effects. However, in the summer when soil temps are closer to 72+ and root growth in fescue has all but ceased, you cannot purchase a fertilizer with out a substantial amount of p it seems
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