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Boll weevil relationship of predicted vs observed peaks of populations to squaring rates of 2 cotton cultivars


, : Boll weevil relationship of predicted vs observed peaks of populations to squaring rates of 2 cotton cultivars. Environmental Entomology 8(3): 506-511

From 1973-1975, 2 varieties of cotton, Stoneville ST-213, a standard cultivar and Tamcot SP-37, a short-season cultivar, planted at approximately 50,400 plants/ha, in river silt in the Lower Rio Grande Valley of Texas [USA], were sampled for adults of the boll weevil, Anthonomus grandis grandis Boheman and boll weevil larval damage to squares. Predictions of 2 models for the peak emergence of adults of 4-5 generations of boll weevils was then compared to the actual times of peak emergence of weevils in the field. A good relationship occurred between the number of days (0-3 days) when adults of F2 were actually observed in cotton and when they were predicted based on the time for 98% adult emergence. From computed cumulative squaring, 50% of the squares occurred 4 and 9 days earlier on SP-37 than on ST-213 in 1973 and 1974, respectively, and populations of weevils were greater in SP-37 than in ST-213 during 2 of the 3 test yr. Reliable data were accumulated from the sampling of 0.25% of the plot area measuring 204 m2.

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