. Boll weevil suppression, management, and elimination technology : proceedings of a conference, February 13-15, 1974, Memphis, Tennessee. Boll weevil, Control, Congresses. Figure 1.—Distribution of Cienfuegosia driimmondii along the lower Texas gulf coast, with designation of localities infested by the boll weevil. Distribution based on records made during the present study, Fryxell (1969), and information provided by M. J. Lukefahr. Coastal Bend region of Texas (Gould and Box 1965). Kenedy County is the only county in this series in which C. drummondii is not known to occur. The reason for t
. Boll weevil suppression, management, and elimination technology : proceedings of a conference, February 13-15, 1974, Memphis, Tennessee. Boll weevil, Control, Congresses. Figure 1.—Distribution of Cienfuegosia driimmondii along the lower Texas gulf coast, with designation of localities infested by the boll weevil. Distribution based on records made during the present study, Fryxell (1969), and information provided by M. J. Lukefahr. Coastal Bend region of Texas (Gould and Box 1965). Kenedy County is the only county in this series in which C. drummondii is not known to occur. The reason for this disjunction in an oth- erwise continuous distribution from north to south is probably due to the predominance of sandy soils in Kenedy County, which constitute an unfavorable habitat for the plant. The inac- cessibility of most of the county resulting from the presence of large ranches and the lack of public roads has also discouraged search for the plant there. A narrow strip of land along the eastern edge of the county adjacent to the La- guna Madre apparently has clayey soils which may be suitable for colonization of the plant. In such case, a narrow corridor would be provided linking the northern and southern populations of the plant. Fryxel (1969) also cites two rec- ords of specimens collected from sites farther inland (at "Gonzales" and on the "banks of the Colorado above Austin"). These records were taken from herbarium specimens collected over 100 years ago and there is no evidence that the plant has been found to occur so far inland since. A 1925 record of the "plant, "S of Dallas," is so vague as to be meaningless. The northern limit of the distribution of C. drummondii in Texas coincides rather well with the line delimiting the northernmost extension of approximately 21° C or higher mean annual air temperatures and 22° C or higher soil tempera- tures (Godfrey et al. 1973). It is likely that temperature is the determining fa
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