scholarly journals Control of Soybean Looper and Beet Armyworm on Soybean in North Louisiana, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 274-274
Author(s):  
Alan T. Wier ◽  
David J. Boethel ◽  
James D. Thomas ◽  
B. Roger Leonard ◽  
Eugene Burris
Keyword(s):  
Growth Stage ◽  
Methyl Parathion ◽  
Field Experiments ◽  
Beet Armyworm ◽  
Research Station ◽  
Hollow Cone ◽  
Spray Volume ◽  
Experimental Treatments ◽  
Soybean Looper ◽  
North Louisiana

Abstract Two field experiments were conducted to evaluate control of soybean looper and beet armyworm on soybean with several insecticides. In Test 1, insecticides were applied to plots measuring 15.2 m long × 8 rows (0.5 m spacing) located at the Northeast Research Station near St. Joseph (Tensas Parish), LA. Plots were arranged in a RCBD with 4 replication blocks. Insecticides were applied with a tractor and compressed air sprayer calibrated to deliver 93.5 liters/ha at 3.8 kg/cm2 through TX12 hollow cone nozzles (2 per row). Insecticides were applied on 24 Aug to ‘Davis’ soybeans in the R5 growth stage. In Test 2, experimental design, number of replications, nozzle size and type, and spray volume per hectare were identical to Test 1. Plots that measured 12.2 m long by 4 rows (1 m spacing) were located at the Macon Ridge Research Station near Winnsboro (Franklin Parish), LA. Sprayer pressure was 2.8 kg/cm2. Insecticides were applied on 25 Aug to ‘Buckshot 723’ soybeans in the R3 growth stage. Posttreatment samples consisted of one set of 25 sweeps per plot (0.38 m diam muslin net), taken 2 and 6 DAT, or 2 and 7 DAT in Tests 1 or 2, respectively. Precipitation did not occur throughout the duration of both tests and plots were not irrigated. Both test areas were treated with methyl parathion before the experiments. Test 1 was treated with 0.56 kg (AI)/ha 2 wk before experimental treatments were applied and Test 2 was treated with 0.28 kg (AI)/ha 3 wk before experimental treatments were applied.

scholarly journals Efficacy of Selected Commercial and Experimental Insecticides Against Late Season Populations of Beet Armyworm, Soybean Looper, and Tobacco Budworm, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 197-197 ◽  
Author(s):  
J. B. Graves ◽  
B. R. Leonard ◽  
C. A. White
Keyword(s):  
Treatment Efficacy ◽  
Tobacco Budworm ◽  
Beet Armyworm ◽  
Research Station ◽  
Hollow Cone ◽  
Late Season ◽  
Soybean Looper ◽  
High Clearance

Abstract Three tests, each consisting of 4-5 insecticide treatments were replicated 4 times in a RCBD at the Macon Ridge Branch of the Northeast Research Station, Winnsboro, LA. Cotton was planted 1 Jul into plots 4 rows (40 inch centers) by 30 ft. Treatments for Tests 1, 2 and 3 were applied on 2, 13 and 14 Sep, respectively, with a high clearance sprayer calibrated to deliver 11.5 gal total spray/acre through Teejet X-8 hollow cone nozzles (2/row) at 46 psi. Treatment efficacy was determined by taking a 10 sweep (standard 15 inch diam net) sample from each plot. Sweep samples were usually taken 2, 4-5 and 6-7 DAT on rows 1, 2 or 3, respectively. The test areas received 0.20, 0.67 and 1.1 inches rainfall on 6, 15 and 16 Sep, respectively.

scholarly journals Evaluation of Selected Bacillus Thuringiensis Insecticides for Control of Soybean Looper in North Louisiana, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 238-238 ◽  
Author(s):  
Rosanne N. Mascarenhas ◽  
Alan T. Wier ◽  
David J. Boethel ◽  
P. Scott Lingren ◽  
B. Rogers Leonard
Keyword(s):  
Block Design ◽  
Experimental Period ◽  
Compressed Air ◽  
Row Spacing ◽  
Research Station ◽  
Hollow Cone ◽  
Randomized Complete Block Design ◽  
Period Data ◽  
Soybean Looper ◽  
North Louisiana

Abstract A field study was conducted at the Macon Ridge Branch, Northeast Research Station, located near Winnsboro (Franklin Parish), Louisiana, to evaluate the efficacy of several B. thuringiensis insecticides for soybean looper control. Test plots were 50 ft long by 5 rows with a 40 inch row spacing and were arranged in a randomized complete block design with four replications. Insecticides were applied with a tractor and compressed air sprayer calibrated to deliver 10 gpa at 38 psi through TX8 hollow cone nozzles (2 per row). Insecticide treatments were applied to soybeans in the R5 stage of growth (beginning seed) on 25 Aug. Posttreatment counts, consisting of 25 sweeps per plot, were taken with a 15 inch diameter muslin net at 2, 5, and 7 DAT. No rainfall occurred and the plots were not irrigated during the experimental period. Data were analyzed using analysis of variance followed by means separation according to DMRT.

scholarly journals Evaluation of Pirate 3 SC Against Boll Worm-Tobacco Budworm in Louisiana, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 231-231
Author(s):  
B. R. Leonard ◽  
P. A. Clay ◽  
E. Burris ◽  
J. B. Graves ◽  
C. A. White
Keyword(s):  
Methyl Parathion ◽  
Sprinkler Irrigation ◽  
Boll Weevil ◽  
Test Area ◽  
Tobacco Budworm ◽  
Beet Armyworm ◽  
Feeding Damage ◽  
Seed Cotton ◽  
Hollow Cone ◽  
Soybean Looper

Abstract Cotton was planted 2 Jun with plots consisting of 4 rows (40 in centers) × 50 ft. Treatments were arranged in a RCBD and replicated 4 times. Applications were made with a high clearance sprayer calibrated to deliver 6 gal total spray/acre through Teejet X-8 hollow cone nozzles (2/row) at 45 psi. Insecticide treatments were applied on 4, 9, 20, 31 Aug. Methyl parathion 4 EC (0.33 lb [AI]/acre) was applied to all plots on 24 and 28 Aug to reduce boll weevil infestations. Efficacy was determined by examining 50 plant terminals and squares per plot on 6, 13, 23 Aug and 2 Sep for evidence of damage and the presence of bollworm-tobacco budworm larvae. The data reported for bollworm-tobacco budworm and boll weevil damage are a summary of trial means across sample dates. High numbers of soybean looper and beet armyworm larvae were observed in the plots during Sep and visual defoliation ratings were estimated to evaluate differences among treatments. Each plot was scored as follows: 0 (no feeding damage), 1 (feeding damage within the lower Vi of the plant), 2 (feeding damage in the lower Vi and middle Vi of the plant) or 3 (feeding damage throughout the plant). The plots were mechanically harvested on 17 and 24 Oct to estimate seed cotton yields. The test area received 2.0 inches rainfall on 6 Aug, 0.5 inch on 20 Aug, and 0.3 inch on 28 Aug. Supplemental moisture was provided by sprinkler irrigation "as needed" during the season but not within 48 h of treatment applications.

scholarly journals Evaluation of Soybean Looper and Stink Bug Control on Soybean, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 312-313
Author(s):  
B. J. Fitzpatrick ◽  
C. G. Clemens ◽  
D. J. Boethel ◽  
S. Micinski
Keyword(s):  
Red River ◽  
Research Station ◽  
Stink Bug ◽  
Sample Plot ◽  
Hollow Cone ◽  
Small Plot ◽  
Soybean Looper ◽  
Sweep Net ◽  
High Clearance

Abstract Efficacy of standard and experimental in secticides was evaluated in two small plot trials conducted at the Red River Research Station located near Bossier City, LA (Bossier Parish). Treatments were applied to ‘Hutcheson’ soybeans with a high clearance, CO2-pressurized sprayer calibrated to deliver 5.9 gpa at 40 psi through TXVS6 hollow cone nozzles (2/row). Plots were 50 ft X 4 rows (40 inch centers) and arranged in a RCBD with 4 replications. Treatments were applied on 20 and 22 Aug in Tests 1 and 2, respectively. One 25-sweep sample/plot was taken with a standard 15-inch diam sweep net at 2, 5, and 9 DAT in Test 1 and 3 and 7 DAT in Test 2. On 27, 28, and 29 Aug both tests received 0.17,0.92, and 0.27 inches of rainfall, respectively. Data were analyzed with ANOVA and means sep arated by DNMRT.

Effect of imazamethabenz on green foxtail, tartary buckwheat and wild oat at different growth stages

1991 ◽  
Vol 71 (3) ◽  
pp. 821-829 ◽  
Author(s):  
K. N. Harker ◽  
P. A. O'Sullivan
Keyword(s):  
Growth Stage ◽  
Field Experiments ◽  
Avena Fatua ◽  
Tartary Buckwheat ◽  
Growth Stages ◽  
Research Station ◽  
Regression Equations ◽  
Wild Oat ◽  
Setaria Viridis ◽  
Green Foxtail

Field experiments were conducted at the Lacombe Research Station to determine the influence of growth stage on the control of wild oat (Avena fatua L.) and Tartary buckwheat (Fagopyrum tartaricum (L.) Gaertn.) with imazamethabenz in wheat (Triticum aestivum L.). In greenhouse experiments, the effct of imazamethabenz on canola (Brassica campestris L.) or green foxtail (Setaria viridis L. Beauv.) at two growth stages was also studied. Canola and wild oat were highly susceptible, Tartary buckwheat was somewhat less susceptible, and green foxtail was rather tolerant to imazamethabenz. Imazamethabenz was much more effective on early growth stages of wild oat (2 leaf) and Tartary buckwheat (1–2 leaf), whereas the control of canola and the suppression of green foxtail was much less dependent on growth stage. Linear regression equations were developed to describe the response of the above species to the imazamethabenz treatments. Key words: AC 222, 293; phenology; regression; Setaria viridis; Fagopyrum tartaricum; Avena fatua

scholarly journals Efficacy of Selected Insecticide Mixtures for Bollworm/Tobacco Budworm Control, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 261-262
Author(s):  
S. Micinski ◽  
R. G. Scarborough ◽  
F. D. Forrester ◽  
J. B. Graves
Keyword(s):  
Experimental Design ◽  
Methyl Parathion ◽  
Red River ◽  
Tobacco Budworm ◽  
Research Station ◽  
Hollow Cone ◽  
Insecticide Mixtures ◽  
High Clearance

Abstract Thirteen treatments (insecticides and mixtures) were evaluated at the Red River Research Station, Bossier City, LA, to determine their efficacy in controlling the BW/TBW complex on cotton. Plots were planted 3 May and were 4 rows X 100 ft on 40-inch centers. All plots had Temik 15G (0.5 lb [AI]/acre) applied m-furrow at planting. The experimental design was a RCB with 4 replications. Prior to trial initiation, plots were oversprayed for boll weevils on 4 Jun and 12 Jul (Vydate C-LV at 0.25 lb [AI]/acre); for BW/TBW on 14 Jun (Orthene 90SP at 1.0 lb [AI]/acre), 29 Jun and 18 Jul (Baythroid 2EC at 0.03 and 0.033 lb [AI]/acre, respectively); and for aphids on 29 Jun and 9 Jul with Lorsban 4EC at 0.5 lb [AI]/acre and Provado 1.6F at 0.047 lb [AI]/acre, respectively. Insecticide treatments were applied in 5.9 gpa at 60 psi with TX-3 hollow-cone nozzles spaced 20 inches apart (2 nozzles/row). Treatment were applied with a high-clearance sprayer equipped with a CO2 system for spraying small plots. Insecticide treatments were applied on 23, 30 Jul and 6 Aug. During and after the trial, all plots were oversprayed for boll weevils with methyl parathion 4EC at 0.33 lb [AI]/acre on 2, 19, 21, 30 Aug and 6 Sep and for BW/TBW on 21 Aug with Baythroid at 0.033 lb [AI]/acre. Infestations of larvae and square damage were monitored on 26 Jul, 1 and 8 Aug by examining 25 squares/plot. Yields were determined by mechanically harvesting the center 2 rows of each plot on 30 Oct.

scholarly journals Evaluation of Pirate 3SC Against Cotton Insect Pests in Louisiana, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 205-205
Author(s):  
B. R. Leonard ◽  
C. A. White ◽  
J. B. Graves
Keyword(s):  
Insect Pests ◽  
Sprinkler Irrigation ◽  
Boll Weevil ◽  
Test Area ◽  
Tobacco Budworm ◽  
Beet Armyworm ◽  
Feeding Damage ◽  
Hollow Cone ◽  
Soybean Looper ◽  
High Clearance

Abstract Cotton was planted 2 Jun with plots consisting of 4 rows (40 inch centers) × 50 ft. Treatments were arranged in a RCBD, replicated 4 times. Applications were made with a high clearance sprayer calibrated to deliver 6 gal total spray/acre through Teejet X-8 hollow cone nozzles (2/row) at 46 psi. Insecticides were applied on 9, 12, 15, 22 Aug and 1 Sep. Treatments were evaluated by examining 50 squares per plot on 12, 15, 19, 26 Aug for evidence of bollworm-tobacco budworm and boll weevil damage. The data reported for boll weevil are a summary of across sample dates. High numbers of soybean looper and beet armyworm larvae were observed in the plots during Sep and visual defoliation ratings were used to evaluate treatments on 21 Sep. Each plot was scored as follows: 0 (no feeding damage), 1 (feeding damage within the lower Vi of the plant), 2 (feeding damage in the lower Vs and middle % of the plant) or 3 (feeding damage throughout the plant). The plots were mechanically harvested on 25 Oct to determine seedcotton yields. The test area received 0.1, 1.9, 0.6 and 0.2 inches rainfall on 14, 21 Aug, and 2, 7 Sep, respectively. Supplemental moisture was provided by sprinkler irrigation “as needed” during the season, but not within 48 h of treatment applications.

scholarly journals Control of Soybean Looper with Experimental Chemistry in Louisiana, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 252-252
Author(s):  
Alan T. Wier ◽  
David J. Boethel ◽  
P. Scott Lingren ◽  
B. Roger Leonard
Keyword(s):  
Growth Regulator ◽  
Insect Growth Regulator ◽  
Compressed Air ◽  
Research Station ◽  
Hollow Cone ◽  
Insect Growth ◽  
Small Plot ◽  
Soybean Looper ◽  
Screening Trial ◽  
Sweep Net

Abstract The efficacy of several experimental insecticides that consist of pyrrole or avermectin chemistry, or exhibit insect growth regulator activity were evaluated against the soybean looper (SBL) on soybean in a small plot insecticide screening trial at the Macon Ridge Branch of the Northeast Research Station near Winnsboro, Louisiana. Activity of these materials was compared to that of the standard recommended insecticide Larvin at 0.6 lb (AI)/acre. Plots measured 50 ft by 5 rows (40 inch spacing) and were arranged in a RCB with 4 replications. Insecticides were applied on 23 Aug (R5, beginning seed stage) with a tractor and compressed air sprayer calibrated to deliver 10 gpa at 38 psi through TX8 hollow cone nozzles. Treatments were evaluated using 25 sweeps (15 inch diameter sweep net) per plot at 2, 5, and 7 DAT. No precipitation occurred throughout the duration of this experiment.

scholarly journals Efficacy of Selected Insecticide Mixtures for Control of the Bollworm/Tobacco Budworm Complex, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 207-207
Author(s):  
S. Micinski ◽  
B. J. Fitzpatrick ◽  
F. D. Forrester ◽  
J. B. Graves
Keyword(s):  
Experimental Design ◽  
Methyl Parathion ◽  
Red River ◽  
Tobacco Budworm ◽  
Research Station ◽  
Hollow Cone ◽  
Predominant Species ◽  
Spray Solution ◽  
Before And After ◽  
Insecticide Mixtures

Abstract Fourteen insecticide treatments were evaluated at the Red River Research Station, Bossier City, LA, to determine their efficacy in controlling the bollworm/tobacco budworm complex on cotton. Cotton was planted 28 Apr and plots were 4 rows × 30.5 m on 102 cm centers. All plots had Temik 15G (0.56 kg (ALVha) and Terraclor Super-X 10-2.5G (1.12 + 0.28 kg (AI)/ha) applied infurrow at planting. The experimental design was a randomized complete block with 4 replications. All plots were oversprayed with Vydate C-LV (0.28 kg (AI)/ha) for plant bugs and weevils on 17 Jun. Plots were oversprayed for the bollworm/tobacco budworm complex before and after the trial with Karate 1EC (0.034 kg (AI)/ha) and Baythroid 2EC + Orthene 90SP (0.031 + 1.12 kg (AI)/ha) on 30 Jun and 26 Aug, respectively. During the trial, plots were oversprayed with Methyl Parathion 4EC at 0.28 and 0.37 kg (AI)/ha on 5 and 10 Aug, respectively. Insecticide treatments were applied in 52.4 liters of finished spray solution/ha at 4.22 kg/cm2 with TX-3 hollow-cone nozzles spaced 50.8 cm apart (2 nozzles/row). Treatments were applied with a high-clearance sprayer equipped with a CO2 system for spraying small plots. Treatments were applied on 20, 26 Jul, 2, 12, and 19 Aug. The 10-day interval between sprays in early Aug resulted from a 5.54-cm rainfall on 8 Aug. Infestations of larvae and square damage were monitored on 25, 28 Jul, 4, and 16 Aug. During the trial, the bollworm was the predominant species. Yields were determined by mechanically harvesting the center 2 rows of each plot on 21 Oct.

scholarly journals Control of Soybean Looper in the Macon Ridge Region of Louisiana, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 236-236
Author(s):  
B. R. Leonard ◽  
C. A. White ◽  
A. T. Wier ◽  
P. S. Lingren
Keyword(s):  
Compressed Air ◽  
Research Station ◽  
Hollow Cone ◽  
Insecticide Efficacy ◽  
Air System ◽  
Soybean Looper ◽  
Sweep Net

Abstract Insecticide efficacy against soybean looper was evaluated at the Macon Ridge Branch of the Northeast Research Station. Plots consisted of 4 rows (40 inch centers) × 50 ft, planted 3 Jun. Treatments in both tests were arranged in a RCB with 4 replications. Insecticides were applied on 23 Aug with a tractor-mounted boom and compressed air system calibrated to deliver 10 gal total spray/acre through Teejet X-8 hollow cone nozzles (2/row) at 38 psi. Treatments were evaluated at 3 and 7 DAT using two 25-sweep samples/plot with a standard 15 inch diameter sweep net. Rows 2 and 3 were sampled 3 DAT and rows 4 and 5 were sampled 7 DAT. No rainfall occurred during the test.

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