Weed control is always a problem if proper steps are not take upfront. Recommendations for weed control from Mississippi State University can be found in this document: http://msucares.com/pubs/publications/p1532.pdf
Controlling weeds as an important management strategy cannot be overstated. Fruit crops do not compete well with weeds, so good control is imperative. Take a look at this document and use it as necessary, but remember THE LABEL IS THE LAW.