In response to producer concerns about the impact of various insecticides on the natural enemy complex in cotton, the Texas Boll Weevil Eradication Foundation changed the insecticides used in the Southern Rolling Plains Zone in 1996. Vydate® was the insecticide being used for control of overwintered boll weevils prior to July 4th. After that date, endosulfan (Phaser® or Thiodan®) was used to control mid season infestations from July 5th until August 10th. After August 20th, malathion ULV was used to control late season infestations and Malathion ULV was used in the diapause control program.