GENETICALLY ENGINEERED CROPS IN THE UNITED STATES - Genetically Engineered Crops in America - page 20

Table 4. (Continued)

Effects on

Crop/researchers/date
of publication

Data
source

Pesticide
use

Net
returns

Yield

Bt cotton
Stark, 1997

Survey Increase Decrease Increase

Gibson et al., 1997 Survey Increase na Increase

ReJesus et al., 1997 Experiments Same na Increase

Bryant et al., 19993 Experiments Increase na Increase

Marra et al., 1998 Survey Increase Decrease Increase

Fernandez-Cornejo et al.,
2000 1

Survey Increase Decrease Increase

Falck-Zepeda et al.,
2000 1

Survey Increase na Increase

Cattaneo et al., 2006 Survey Increase Decrease na

Piggott and Marra, 2007 Experiments Increase na Increase

Bt corn
Rice and Pilcher, 1998 1

Survey Increase Decrease Depends on

infestation

Marra et al., 1998 Survey Increase Decrease Increase

Duffy, 2001 2 Survey Increase Na Same

Baute, Sears, and
Schaafsma, 2002

Experiments Increase Na Depends on

infestation

McBride & El-Osta,
2002 4

Survey Na Na Decrease

Pilcher et al., 2002 5 Survey Increase Decrease Na

Dillehay et al., 2004 6 Experiments Increase Na Na

Mitchell et al., 2004 7 Experiments Increase Na Depends on

infestation

Fernandez-Cornejo and
Li, 2005 8

Survey Increase Decrease Na

Mungai et al., 2005 9 Experiments Increase Na Na
Fang et al., 2007 10 Experiments Increase Na Na
na = not analyzed in the study; 1 Results using 1997 data; 2 Results using 1998 data;
3 Results are for 1996 and 1998, results were different for 1997 when the pest
pressure was low; 4 Results using 1998 data; 5 Results using 1996-1998 data;
6 Results using 2004-2006 data; 7 Results using data from 1997-1999 ; 8 Results
using data from 2001; 9 Results using data from 2002-2003, 10 Results using data
from 2002.