Effect of Selected Early Treatments on Cotton Pests, Predators, Flowering and Leaf Area, 1985

The test was conducted for determination of early insecticide treatment effects on cotton and the pest/predator complex that occurs in May-Jun. Cotton was planted on 16 Apr in 40 inch rows. Plots were 8 rows × 95 ft replicated 4 times. Insecticides were applied with a high-clearance sprayer equipped with a CO2 system for spraying small plots, delivering 3 gal/acre with 2 X-4 hollow cone nozzles/row. Early season treatments were started at the 2nd fully expanded leaf stage of cotton and applied 4 times; 10, 16, 22, and 27 May. Leaf area measurements were made with a Licor leaf area machine, measuring 10 plants/plot that were removed from the field and immediately processed. White flowers/95 row ft were counted on 17, 19, 24 and 27 Jun. Sweep net data were collected by making 25 sweeps/plot per sampling date. Other insecticides applied for major pest and/or secondary insect control were: 16 Apr, Temik 15G + Terraclor Super-X 0.75 + 0.25 + 1.0 lb (AI)/acre, 7 Jun Capture (2E) 0.05 (AI)/acre, 11 Jun Pydrin (2.4E) + Monitor (4E) 0.1 + 0.125 (AI)/acre, 5 Jul Pydrin (2.4E) + Fundal (4E) 0.05 + 0.125 (AI/acre), 25 Jun Baythroid (2E) 0.03, 6 Aug Curacron (6E) + Galecron (4E) 0.75 + 0.125 (AI)/acre, 12 Aug Guthion (2L) 0.25 (AI/acre), 25 Aug Baythroid (2E) 0.033 (AI)/ acre. On 5 Sep the test was defoliated with Folex + Dropp 1.2 pt/acre + 0.1 lb/acre and Prep 1.0 pt/acre was applied on 11 Sep. Four rows from each plot were harvested on 18 Sep with a 2 row John Deere picker, equipped with a sacking device. Yields were converted to lb seed/cotton/ acre.