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Table 4 Projections required quantifying the impact of GE crops on insecticide use in the US, 1996–2011

From: Impacts of genetically engineered crops on pesticide use in the U.S. -- the first sixteen years

Parameter Supplemental table(s) impacted Basis for setting value Basis and explanation
Corn    
Share of Insecticide Applications Targeting the European Corn Borer (ECB) Versus Corn Rootworm (CRW) 11, 12 Guidance from extension IPM specialists and land grant university spray guides Some insecticides applied exclusively for control of ECB, others for control of CRW; and some target both. The percent hectares treated with a given insecticide are apportioned relative to target pests: ECB, CRW, or other insects.
“Other Insecticides” Applied in 2010 for ECB Control 11 NASS data on “Other Insecticides” applied in 2010 NASS reported 237,000 pounds of “Other Insecticide” use in 2010; 30% of these “Other Insecticides” applied to corn in 2010 projected to target the ECB.
“Other Insecticides” Applied in 2010 for CRW Control 12 NASS data on “Other Insecticides” applied in 2010 NASS reported 237,000 pounds of “Other Insecticide” use in 2010; 60% of “Other Insecticides” applied to corn in 2010 projected to target the CRW.
Cotton    
Share of Insecticide Applications Targeting the Budworm/Bollworm Complex 13 Guidance from extension IPM specialists and land grant university spray guides Some insecticides applied exclusively or partly for control of the budworm/bollworm complex, others for other insects; percent hectares treated with a given insecticide is apportioned relative to target insects.