Bt cotton varieties have expanded their demand in Chihuahua, México since 1998. This was due to the presence of insect pests such as the complex tobacco bud/bollworm and pink bollworm. Cotton growers planted 57,185 ha total (1,000 ha of Bt cotton) in 1998, 33,013 ha total (6,000 ha of Bt cotton) in 1999, and 33,084 ha total (9,000 ha of Bt cotton0 in 2000.