. Boll weevil suppression, management, and elimination technology : proceedings of a conference, February 13-15, 1974, Memphis, Tennessee. Boll weevil, Control, Congresses. Figure —Location anchnumber of boll weevil infested fields and acres detected in the units of the eradica- tion zone in 1973. infestations. The sampling methods employed by APHIS personnel in detecting infestations were as effective as the methods used in the in- tensive sampling From the week of May 9 through August 8 in the first buffer zone, 49 native adults were found in 29 trap crops, and 39 native adults we
. Boll weevil suppression, management, and elimination technology : proceedings of a conference, February 13-15, 1974, Memphis, Tennessee. Boll weevil, Control, Congresses. Figure —Location anchnumber of boll weevil infested fields and acres detected in the units of the eradica- tion zone in 1973. infestations. The sampling methods employed by APHIS personnel in detecting infestations were as effective as the methods used in the in- tensive sampling From the week of May 9 through August 8 in the first buffer zone, 49 native adults were found in 29 trap crops, and 39 native adults were found in 29 fields of farmer cotton by visual survey (table 5). All native adults were found in the trap crop during the weeks of May 9 through July 11, while only one native adult was found in farmer cotton prior to the week of July 4. Based on visual survey, the ratio of sterile to native adults during the season averaged 1 to 1 in trap crops and to 1 in farmer cotton in the first buffer zone. This is a much lower ratio than that which existed in the eradication zone, but is based on all fields, rather than only on fields in which weevils were released in each particular week. 3 See Lloyd and Scott, "Intensive Sampling of Twenty- five Selected Fields in Eradication and First Buffer- Areas of the Pilot Boll Weevil Eradication Experiment in 1973," this volume. Two hundred and thirty square surveys in the first buffer zone detected 2,072 suspect oviposi- tion-damaged square- in what amounted to 136 individual fields (table 6). These squares con- tained 493 immatures and 333 eggs, of which the majority came from units 2 and 3. These units were directly north of the eradication zone and adjacent to the greatest amount of boll weevil infested cotton acreage in the seconu buffer zone. Boll weevil surveys in the northern portion of the second buffer zone monitored population buildup so that insecticide treatments could be applied to prevent development of large num
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