K. Emfinger

EVALUATION OF SELECTED INSECTICIDES AGAINST TARNISHED PLANT BUGS IN COTTON, 2013

An insecticide efficacy trial was conducted during 2013 at the Northeast Research Station (NERS) near St. Joseph, LA (Tensas Parish). Cotton seed was planted on 40 inch rows into a Commerce silt loam on 30 May at NERS. The test was a RCB design with 4 replicates. Plot size was 4 rows × 50 ft. Insecticides were applied using a John Deere 6000 series high clearance sprayer calibrated to deliver 10 gpa at 3.5 mph with Tee Jet TX-8 hollow cone nozzles (2/row) to all four rows of each plot on 30 Jul and 7 Aug. Post-treatment evaluations were made at 3 and 7 DAT1, and 6 DAT2. Plots were sampled with a standard 2.5 x 2.5 ft black cloth shake sheet by taking two sub-samples from the two center rows of each plot. Data were subjected to ANOVA and means were separated using an F protected LSD (P < 0.10).

EVALUATION OF SELECTED INSECTICIDES AGAINST STINK BUG (PIEZADORUS GUILDINII (WESTWOOD)) ON COTTON BOLLS, 2005

Selected insecticides were evaluated for their effectiveness against P. guildinii on cotton bolls at the Macon Ridge Research Station (Franklin Parish). DeltaPearl cotton seed was planted on May 2 in a Gigger-Gilbert silt loam soil. Plots consisted of four rows centered on 40-inches and 30 ft in length. Treatments were arranged in a RCB design with four replications. Insecticides were applied with a tractor-mounted boom and compressed air system calibrated to deliver 10 gpa through Flatfan 80015 twin jet nozzles (2/row) at 30 psi on 3 Aug. First position quartersized bolls in the upper one-half of the plant were harvested and placed in 29.5 ml plastic cups. Ten plants were sampled for one boll/plant in each of the four replicates. The samples were placed on ice and transported to the laboratory. One P. guildinii stink bug adult was infested in each cup (1 bug/boll/cup). Insect mortality was rated 24, 48, and 72 h after infestation (HAI). A stink bug was considered dead if it was unable to right itself within 15 s after being inverted with a metal probe. Data were subjected to ANOVA and means separated according to DMRT. No rainfall occurred between insecticide application and boll removal from the field.

EVALUATION OF SELECTED INSECTICIDES AGAINST HELIOTHINES IN COTTON, 2004

Cotton seed were planted 5 Jun in plots consisting of four rows (centered on 40 inches) x 50 ft. Treatments were arranged in a RCB design and replicated four times. Insecticides were applied with a hi-clearance sprayer and CO2 charged system calibrated to deliver 6 gpa through Teejet TX-8 hollow cone nozzles (2/row) at 48 psi. Insecticides were applied on 23, 28 Jul, and 1 Aug. Treatments were evaluated by examining 50 flower buds (squares) per plot on 27, 31 Jul, and 5 Aug, for evidence of bollworm (BW) and tobacco budworm (TBW) damage and squares infested with larvae. Data were analyzed with ANOVA, and means were separated according to Tukey’s test.