Question

I recently read where you should rotate your preemergent herbicide every few years so that you do not have a weed resistance problem. Is there any truth to this? I have been using pendimethalin on lawns since 1986 with excellent results.

Answer

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Although this is sound advice, weed resistance with preemergents in turf has not been a concern. In a couple of isolated areas in the south, goosegrass resistance has been observed but has been corrected by rotating to a herbicide with a different mode of action.