Table 1. Analysis of variance for survival and corrected survival in plant-based bioassays in each year.

		Survival			Corrected Survival
Year	Effect	DF	F	P	DF	F	P
2015	Population a	8, 169	14.98	<0.0001	8, 84	6.03	<0.0001
	Corn type d	1, 169	44.42	<0.0001	-	-	-
	Pop. × Corn type	8, 169	1.84	0.07	-	-	-
2016	Population b	10, 314	8.38	<0.0001	10, 167	9.96	<0.0001
	Corn type	1, 314	51.74	<0.0001	-	-	-
	Pop. × Corn type	10, 314	7.75	<0.0001	-	-	-
2017	Population c	6, 203	26.55	<0.0001	6, 102	20.55	<0.0001
	Corn type	1, 203	115.17	<0.0001	-	-	-
	Pop. × Corn type	6, 203	10.8	<0.0001	-	-	-

^a 2015 populations: 4 control, 2 focal fields, 3 surrounding fields.

^b 2016 populations: 5 control replicates, 2 focal fields, 4 surrounding fields.

^c 2017 populations: 4 control replicates, 3 surrounding fields.

^d Corn type = Cry3Bb1 corn vs non-Bt corn.