Table 5.

Differences in management approaches for 6 yr in non-problem and problem counties

Field history metrica	Non-problem countyb	Problem countyb	df	T	P
Years cont. cornc	5.24 ± 1.35 (17)	7.20 ± 1.03 (20)	35	2.28	0.01
Proportion cornc	0.74 ± 0.06 (17)	0.88 ± 0.05 (20)	35	1.83	0.03
Proportion S.I. usec,e	0.04 ± 0.03 (12)	0.27 ± 0.09 (20)	25.23	2.24	0.02
Proportion non-Btc,e	0.32 ± 0.11 (10)	0.11 ± 0.03 (20)	11.53	1.67	0.06
Proportion Cry3d,e	0.21 ± 0.11 (10)	0.05 ± 0.03 (20)	10.71	1.31	0.22
Proportion Cry34/35Ab1d,e	0.05 ± 0.05 (10)	0.42 ± 0.08 (20)	27.95	3.87	0.0006
Proportion Cry34/35Ab1 + Cry3d,e	0.42 ± 0.12 (10)	0.42 ± 0.06 (20)	28	0.05	0.96
Proportion S.I. on Btd,e	0.05 ± 0.04 (10)	0.24 ± 0.09 (20)	26.94	1.82	0.08
Proportion S.I. on non-Btf	0.00 ± N/A (10)	0.03 ± 0.02 (20)	-	-	-

^aField history metrics are proportions of years the management tactics was used out of the most recent 6 yr, except years of continuous corn, which is the total number of years the field had been planted to corn since 2003. S.I. = soil insecticide.

^bMean ± SE (N).

^cOne-tailed t-test was conducted.

^dTwo-tailed t-test was conducted.

^eSatterthwaite method was used due to unequal variances.

^fNo test was conducted.