T3 when we split the stalk and found some roots that showed the purple giberella,a few roots on the same ball didn't.There were grubs laying on what was left of the roots that had gib.Roots without the purple were whole and not eaten .It's like walking the feed lot bare footed,more likly to get infected with a cut.Couldn't tell much differance in our Bt the same moisture as non Bt as for as being down at the roots,less broken over in Bt.David P.S.I live in Giles County