I talked to the County Agent today, rust is in Fla and Alabama. , nothing spotted any farther North than that.... Did you spray with epsom salts, or Manganese, try Epsom salts 10lbs to 20 gal water to the acre.... Also Sean if a hurricane comes up the East coast before labor day then Rust might be a concern, if it happens after labor day I understand nothing to worry about as the maturity is pretty welll established... I will keep you posted,, It vlooks like a Magnesium deficiency to me Spray with the salts, try a plot and see what effect it has......