Cotton fields were surveyed in late season 1989, before harvest. Defoliated fields were selected whenever possible. A total of 57 fields were selected in the three cotton growing regions in Louisiana: Delta, Macon Ridge and Red River valley. The numbers presented in tables 1, 2, and 3 represent mature weeds only. Therefore this survey reflects weeds not being controlled rather than the total number of species present. The survey should reflect weeds that are competitive with the crop season long. Obviously, some of these weeds are more competitive than others.

The survey technique consisted of counting all mature weeds on two adjacent rows (Boll wide) for 50 feet, or a total of 100 row feet. Four areas were randomly selected in each field for a total of 400 row feet in each field. Fields were randomly selected and were separated by a minimum of two miles.