Journal of Insect Science: Vol. 9 | Article 8

Table 6. Damage to, and populations of lepidopterous larvae on, BT transgenic and nontransgenic (parent) sweet corn treated with biologically based insecticides, Charleston, SC, 2006.

		Whorl Stage			Harvest
Genotype, Dependent variable	Treatment^a Statistic^b	Plant height, cm^c	Damaged plants, %^c	FAW per plant^c	Ears per sample^c	Damaged ears, %^c	FAW per ear^c	CEW per ear^c
BT	1. Control	29.4 ± 1.5^b	100 ± 0.0^b	0.58 ± 0.13^c	22.8 ± 1.3^a	76.4 ± 7.5^c	0.15 ± 0.03^c	0.18 ± 0.01^a
	2. Nematodes	27.2 ± 1.3^b	90.0 ± 4.1^b	0.30 ± 0.09^b	18.8 ± 2.3^a	67.3 ± 8.0^b^c	0.32 ± 0.10^d	0.13 ± 0.07^a
	3. Viruses	27.0 ± 1.3^b	95.0 ± 2.9^b	0.18 ± 0.06^a^b	21.0 ± 0.8^a	68.8 ± 4.4^b^c	0.04 ± 0.01^a^b	0.24 ± 0.05^a
	4. Beauveria	22.6 ± 0.8^b	95.0 ± 2.9^b	0.13 ± 0.05^a^b	22.5 ± 5.0^a	74.9 ± 2.1^c	0.12 ± 0.05^b^c	0.10 ± 0.06^a
	5. Spinosad	26.9 ± 0.6^b	55.0 ± 9.6^a	0.00 ± 0.00^a	24.3 ± 5.8^a	54.1 ± 9.9^b	0.00 ± 0.00^a	0.20 ± 0.08^a
	6. Neem	22.1 ± 1.4^a	82.5 ± 14.4^b	0.08 ± 0.03^a	19.3 ± 3.0^a	32.1 ± 6.6^a	0.02 ± 0.02^a^b	0.06 ± 0.04^a
Parent	1. Control	19.5 ± 0.4^a	100 ± 0.0^b	3.68 ± 0.10^d	8.8 ± 1.1^a	100 ± 0.0^b	0.42 ± 0.17^c	0.73 ± 0.17^b^c
	2. Nematodes	20.0 ± 1.4^a	100 ± 0.0^b	1.10 ± 0.11^c	15.8 ± 1.1^b^c	98.6 ± 1.4^b	0.54 ± 0.05^d	0.50 ± 0.21^a^b
	3. Viruses	25.3 ± 1.3^b	97.5 ± 2.5^b	0.20 ± 0.06^a^b	21.3 ± 0.5^c^d	98.9 ± 1.4^b	0.06 ± 0.01^a^b	0.13 ± 0.04^a
	4. Beauveria	21.4 ± 1.0^a	100 ± 0.0^b	1.05 ± 0.18^c	13.8 ± 0.5^a^b	98.1 ± 1.9^b	0.22 ± 0.05^b^c	0.62 ± 0.09^b^c
	5. Spinosad	28.2 ± 0.05^c	50.0 ± 7.1^a	0.00 ± 0.00^a	25.3 ± 3.1^d	82.0 ± 5.2^a	0.01 ± 0.01^a	0.52 ± 0.12^a^b
	6. Neem	20.8 ± 0.05^a	100 ± 0.0^b	0.48 ± 0.12^b	19.3 ± 2.7^b^c	97.9 ± 2.1^b	0.14 ± 0.06^a^b	0.97 ± 0.10^c
Genotype	F	46.38	6.87	263.45	7.83	220.34	11.83	51.69
	P	0.0001	0.0132	0.0001	0.0085	0.0001	0.0016	0.0001
Treatment	F	8.62	21.38	135.76	3.21	9.30	13.74	2.44
	P	0.0001	0.0001	0.0001	0.0181	0.0001	0.0001	0.0551
Interaction	F	8.51	1.50	76.53	2.86	4.83	1.48	5.31
	P	0.0001	0.2166	0.0001	0.0298	0.0020	0.2231	0.0011

^aSee Table 1 for further description of treatments.

^bDegrees of freedom = 1, 33 for corn genotype, 4, 33 for treatment and interaction.

^cMeans within corn genotype with the same letter are not significantly different (P > 0.05) by LSD.