Journal of Insect Science: Vol. 9 | Article 22

Table 3. Efficacy of transgenic cotton cultivars against key cotton pests based on reduction of field pest density in transgenic fields compared to nontransgenic fields.

Pest species	Bollgard	Bollgard II	Widestrike	VipCot	Cry1A
Helicoverpa spp.	Low-High^a,^b,^c,^d,^e	High^c,^d,^e	Moderate-High^k	High^m	Low-High^b
Heliothis virescens	High^f	High^f	High^k	High^m	-
Pectinophora gossypiella	Low-High^e,^g,^h,ⁱ,^j	High^g	High^k	-	Moderate-Highⁱ
Spodoptera spp.	Low-Moderate^d,^f	Moderate-High^d,^f	Moderate^l	-	-
Jassids	-	-	-	No effectⁿ	-
Aphids	-	-	-	No effectⁿ	-
Whitefly	No effect^j	-	-	No effectⁿ	-
Mirids	No effect^j	-	-	No effectⁿ	-
Thrips	No effect^j	-	-	No effectⁿ	-
Mites	-	-	-	No effectⁿ	-

Percent reduction of insect density was calculated using Abbot’s formula [100 × (1 – insect density in transgenic field/insect density in non-transgenic field)], rounded to the nearest percent, and assigned to the following categories: High = reduction ≥ 90%; Moderate = 60–89% reduction; Low = reduction < 60%; No effect = transgenic cotton had no effect on pest density.

Details on calculations are presented in Appendix B. Cultivars sGK321, Cry1EC, and LecGNA2 are not included because field density data were not available. Similarly, Earias spp. and Diparopsis spp. were excluded.

^aWu et al. 2003b

^bWan et al. 2005

^cJackson et al. 2003

^dChitkowski et al. 2003

^eUdikeri et al. 2007

^fAdamczyk et al. 2001b, Adamczyk et al. 2001c

^gMarchosky et al. 2001

^hTabashnik et al. 2000

ⁱWan et al. 2004

^jWilson et al. 1992

^kUnited States Environmental Protection Agency 2005b

^lAdamczyk and Gore 2004

^mKurtz et al. 2007

ⁿWhitehouse et al. 2007 – results for Cot102 only