scholarly journals Evaluation of Selected Foliar Applied Insecticides on Potato Leafhopper in Virginia-Type Peanut, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 253-254
Author(s):  
D. A. Herbert
Keyword(s):  
Test Area ◽  
Potato Leafhopper ◽  
Row Spacing ◽  
Hollow Cone ◽  
Isle Of Wight ◽  
Full Coverage ◽  
Pre Treatment ◽  
Over The Top ◽  
Sweep Net ◽  
Area Data

Abstract Selected foliar applied insecticides were evaluated against PLH in Virginia-type peanut. ‘VA-C 92R’ peanut was planted on a producer’s farm in Isle of Wight County, VA using 36-inch row spacing. Foliar treatments were applied on 31 Jul as a full-coverage spray with a CO2-pressurized backpack sprayer calibrated to deliver 14.5 gpa at 50 psi through three D2-13 hollow-cone nozzles per row, one over the top and one on each side of each row. A RCB design was used with 4 replicates. Plots were 4 rows by 40 ft. PLH were sampled by making 5 sweeps per plot with a 15-cm-diameter sweep net and counting numbers of captured adults and nymphs. The pre-treatment sample was not taken on each plot, but was comprised of 20 random 5-sweep samples distributed throughout the planned test area. Data were analyzed using ANOVA and LSD procedures.

scholarly journals Effect of Selected Insecticide/Acaricides on Twospotted Spider Mite in Virginia Peanut, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 277-277
Author(s):  
D. A. Herbert
Keyword(s):  
Spider Mite ◽  
Row Spacing ◽  
Twospotted Spider Mite ◽  
Hollow Cone ◽  
Isle Of Wight ◽  
Statistical Procedures ◽  
Hollow Cone Spray ◽  
Over The Top ◽  
Mite Number ◽  
Made In

Abstract Selected insecticide/acaricides were evaluated for efficacy against TSSM in cv. ‘NC 7’ Virginia-type peanut in Isle of Wight County, VA. Peanuts were planted on 4 May using a 36-inch row spacing. All treatments were applied on 28 Jul. The Comite + 5 d treatment was applied again on 5 Aug. Karate, at the 0.025 and 0.04 lb (AI)/acre rates, Capture C, and Danitol were applied again on 9 Aug. All were applied using a CO2 pressurized backpack sprayer calibrated to deliver 14.5 gpa at 50 psi through three D2-13 disc-core hollow cone spray nozzles per row, 1 over the top and 1 on each side. A RCB experimental design was used with 4 replicates; plots were 4 rows by 15 ft. Treatments were evaluated on 28, 31 Jul and on 3, 7, 11, 16, 22 and 29 Aug by comparing the number of live mites in a 1.5 cm diam area on 2 randomly selected leaflets per plot. Mite counts were made in the field using 10x magnification lenses. Data were analyzed using ANOVA and LSD statistical procedures. Cumulative mite-days (CMD) were calculated for each treatment over the entire test period using Σ(Xi+1 – Xi)[(Yi + Yi+1)/2], where Xi and Xi+1 are adjacent sample dates and Yi and Yi+1 are corresponding points of mean mite number per leaflet.

scholarly journals Selected Insecticides for Control of Corn Earworm and Green Cloverworm in Soybean in Virginia, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 281-282
Author(s):  
D. A. Herbert
Keyword(s):  
Experimental Design ◽  
Corn Earworm ◽  
Test Area ◽  
Row Spacing ◽  
Statistical Procedures ◽  
Foliar Sprays ◽  
Insect Populations ◽  
Pre Treatment ◽  
Treatment Application ◽  
Sweep Net

Abstract Efficacy of selected insecticides was evaluated against CEW and GCW in soybean. ‘Hutcheson’ soybean was planted 15 June in a producer’s field in Greensville County, VA, using an 18-inch row spacing. All treatments were broadcast as foliar sprays with water on 27 August using a CO2 pressurized backpack sprayer calibrated to deliver 14.3 gpa at 18 psi through 8002VS flat fan nozzles spaced 18 inches apart on the spray boom. A RCB experimental design was used with 4 replicates; plots were 4 rows by 50 ft. Insect samples were taken using a 15-cm diameter sweep net, 15 sweeps per plot. Pre-treatment insect populations were assessed just prior to treatment application by taking several 15-sweep samples throughout the planned test area. Post-treatment samples were taken 2, 4, 8, 12, and 21 days after treatment (DAT) by comparing numbers of small (1st and 2nd instars), medium (3rd and 4th instars), large (5th and 6th instars) and total CEW larvae, and total (all sizes) GCW larvae. Data were analyzing using ANOVA and LSD statistical procedures.

scholarly journals Different Application Schedules and Insecticide Rates for Control of Bollworm in Virginia Cotton. 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 252-253
Author(s):  
D. A. Herbert
Keyword(s):  
Experimental Design ◽  
Virginia Tech ◽  
Row Spacing ◽  
Hollow Cone ◽  
Statistical Procedures ◽  
Standard Rate ◽  
Over The Top

Abstract Different application schedules with insecticides at different rates were evaluated for control of bollworm in VA. ‘Sure-Grow 501’ cotton was planted 1 May at the Virginia Tech Tidewater Agric. Res. & Ext. Ctr., Suffolk, VA, using a 36-inch row spacing. All treatments were applied with a CO2 pressurized backpack sprayer calibrated to deliver 14.5 gpa at 50 psi through three, D2-13 disc-core hollow cone nozzles per row, one over the top of the row and one on each side. Four application schedule/insecticide rate combinations were tested: 1)3 applications at the standard rate, the 1 st at the egg threshold, the 2nd in 5d, and the 3rd in l0d; 2) 2 applications at the standard rate, the 1st at the egg threshold, the 2nd in 5d; 3) 2 applications, the 1st at the egg threshold using 1.6x the standard rate, and the 2nd in 5d using the standard rate; 4) 1 application at the egg threshold using 1.6x the standard rate. Egg threshold application was based on the presence of 10 or more bollworm eggs per 100 plant terminals, or 2 or more per 100 fruil (squares or bolls). A RCB experimental design was used with 4 replicates; plots were 6 rows by 30 ft. Boll damage and bollworm numbers were determined by sampling 25 randomly selected bolls per plot. Samples were taken at roughly weekly intervals after the occurrence of the egg threshold. Yield was determined by harvesting the 2 center rows of each plot (60 row ft per plot) using a commercial 2-row John Deere cotton combine. Lint values were calculated as 37% of total plot weights, assuming 63% was seed and trash. Data were analyzed using ANOVA and LSD statistical procedures.

scholarly journals Control of Soybean Insect Pests in the Macon Ridge Region of Louisiana, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 270-270
Author(s):  
B. R. Leonard ◽  
P. A. Clay ◽  
D. J. Boethel ◽  
J. Thomas ◽  
A. T. Weir
Keyword(s):  
Insect Pests ◽  
Test Area ◽  
Compressed Air ◽  
Hollow Cone ◽  
Insecticide Efficacy ◽  
Air System ◽  
Sweep Net

Abstract Two tests were conducted to evaluate insecticide efficacy against foliage feeding insect pests of soybean. Plots consisted of 5 rows (40 inch centers) × 50 ft, were planted on 7 Jun. Treatments in both tests were arranged in a RCBD with 4 replications. Insecticides were applied with a tractor-mounted boom and compressed air system calibrated to deliver 10 gal total spray/acre through Teejet X-12 hollow cone nozzles (2/row) at 30 psi. Treatments were applied on 18 Aug and 20 Aug in Test 1 and Test 2, respectively. Insecticide efficacy was evaluated at 2 and 7 DAT using two 25-sweep samples/plot with a standard 15 inch diam sweep net. Rows 2 and 3 were sampled 2 DAT and rows 4 and 5 were sampled 7 DAT. On 20 Aug. 0.5 inches rainfall was recorded over the test area. However, the treatments in Test 2 were not applied until after the rainfall had occurred.

scholarly journals Selected Pyrethroid and Non-Pyrethroid Insecticides for Control of Cotton Bollworm on Cotton, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 232-233
Author(s):  
D. A. Herbert
Keyword(s):  
Field Trial ◽  
Field Trials ◽  
Virginia Tech ◽  
Row Spacing ◽  
Hollow Cone ◽  
Insecticide Treatment ◽  
Pyrethroid Insecticides ◽  
Statistical Procedures ◽  
Over The Top ◽  
Stage Yield

Abstract Two field trials were conducted to evaluate efficacy of selected pyrethroid (Field Trial 1) and non-pyrethroid (Field Trial 2) insecticides for control of bollworm in Virginia cotton. ‘Delta and Pine Land 51’ cotton was planted 2 May at the Virginia Tech Tidewater Agric. Res. & Ext. Ctr., Suffolk, VA using a 36-inch row spacing. All treatments were applied with a CO2-pressurized backpack sprayer calibrated to deliver 10 gpa at 39 psi through one TX10 hollow cone nozzle over the top of each of the 2 center rows of each plot. All applications were applied at egg threshold (based on the presence of 10 or more bollworm eggs per 100 plant terminals, or 2 or more per 100 fruit, i.e., squares or bolls) and again in 5 days. A RCB design was used with 4 replicates; plots were 4 rows by 40 ft. Boll damage was determined by sampling 25 randomly selected bolls per plot. Samples were taken at roughly weekly intervals after the second insecticide treatment until bolls were matured beyond the susceptible stage. Yield was determined by harvesting the 2 center rows of each plot (80 row ft per plot) using a commercial 2-row John Deere cotton combine. Lint values were calculated as 37% of total plot weights, assuming 63% was seed and trash. Data were analyzed using ANOVA and LSD statistical procedures.

scholarly journals Control of Twospotted Spider Mite in Peanut, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 250-250
Author(s):  
D. A. Herbert, Jr.
Keyword(s):  
Spider Mite ◽  
Row Spacing ◽  
Twospotted Spider Mite ◽  
Hollow Cone ◽  
Cumulative Index ◽  
Statistical Procedures ◽  
Hollow Cone Spray ◽  
Over The Top ◽  
Mite Number ◽  
Made In

Abstract Selected pesticides were evaluated for control of TSSM in cv. ‘NC-10’ Virginia-type peanut in Suffolk, VA. Peanuts were planted using a 36-inch row spacing. Treatments were applied on 28 Jul and again on 10 Aug using a CO2-pressurized back-pack sprayer calibrated to deliver 14.5 gal formulation per acre at 50 psi through three D2-13 disc-core hollow cone spray nozzles per row, 1 over the top and 1 on each side. A RCBD was used with 4 replicates; plots were 4 rows × 20 ft. Treatments were evaluated on 28, 30 Jul and on 3, 5, 10, 13, 20, and 29 Aug by comparing the number of live mites in a 1.5 cm diam area on 4 randomly-selected leaflets per plot. Mite counts were made in the field using 10X magnification lenses. Data were analyzed using ANOVA and LSD statistical procedures. A cumulative index (CI) was calculated for each treatment using ∑(Xi+1 - Xi)[(Yi + Yi+1)/2], where Xi, and Xi+1, are adjacent sample dates and Yi and Yi+1, are corresponding points of total mite number.

scholarly journals Greenhouse Evaluation of Insecticides for Control of Yellow Sugarcane Aphid and Greenbug on Sorghum Seedlings, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 230-230
Author(s):  
R. M. Anderson ◽  
G. L. Teetes
Keyword(s):  
Grain Sorghum ◽  
Hollow Cone ◽  
Soil Mixture ◽  
Insecticide Application ◽  
Sugarcane Aphid ◽  
Greenhouse Evaluation ◽  
Seedling Plant ◽  
Plant Emergence ◽  
Spray Volume ◽  
Pre Treatment

Abstract Foliar treatments of 2 organophosphates and imidachloprid (Confidor) were evaluated for yellow sugarcane aphid (YSA) and greenbug (GB) control in a research greenhouse at Texas A&M University. Hybrid grain sorghum seedlings (ATx399 × RTx430) were grown in 110-mm germination pots containing a prepared soil mixture composed of peat, vermiculite, and periite in a 2:1:1 ratio, respectively. Four days after plant emergence and 3 d prior to insecticide applications, each seedling plant was infested with 10-20 YSA or GB. There were 5 singleseedling replications for each treatment. Insecticides were applied by using a CO2-pressurized backpack sprayer, through TX-3 hollow-cone nozzles at 35 psi, producing a finished spray volume of 5.6 gpa. Pre-treatment counts of YSA and GB were made the day of insecticide application; post-treatment counts of aphids were made 1, 2, and 3 DAT. Percent control was calculated by using Abbott’s (1925) formula. Data were statistically analyzed by using ANOVA and LSD.

Velvetbean Caterpillar Control on Louisiana Soybean, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 271-272
Author(s):  
J. D. Thomas ◽  
A. T. Wier ◽  
M. L. Boyd ◽  
S. Lingren ◽  
D. J. Boethel
Keyword(s):  
Growth Stage ◽  
Compressed Air ◽  
Row Spacing ◽  
Research Station ◽  
Velvetbean Caterpillar ◽  
Small Plot ◽  
Sweep Net

Abstract The efficacy of selected insecticides for control of VBC was evaluated in 3 small plot insecticide trials at the St. Gabriel Research Station near St. Gabriel, LA. Treatments in all 3 tests were applied to ‘Buckshot 723’ soybean in the R5 growth stage using a tractor and compressed air sprayer calibrated to deliver 93.5 1/ha at 2.66 kg/cm2 through 8002 flat fan nozzles. Plots in all tests were 5 rows wide (0.91 m row spacing) by 15.2 m, arranged in a RCBD with 4 replications. At 2 and 7 DAT in each test, one 25 sweep sample was taken from each plot with a standard 38.2 cm diam sweep net. Test 1 was applied 6 Sep, Test 2 was applied 8 Sep, and Tesi 3 was applied 14 Sep.

scholarly journals Potato Leafhopper Control, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 170-172
Author(s):  
Arthur A. Hower ◽  
Paul Rebarchak
Keyword(s):  
Agricultural Research ◽  
Dry Weight ◽  
Potato Leafhopper ◽  
Insecticide Treatment ◽  
Untreated Check ◽  
Second Year ◽  
Pre Treatment ◽  
Harvest Year ◽  
Rock Springs ◽  
Forage Harvester

Abstract Two tests were conducted to evaluate the efficacy of insecticides against potato leafhopper. The experiments were conducted at the Russell E. Larson Agricultural Research Center at Rock Springs, Centre County, PA on a second-year (first full harvest year) alfalfa (Pioneer 5373) crop. Plots of 40 X 40 ft were arranged in a RCB design with an untreated check in each of four replications. Potato leafhopper densities were estimated from 20 pendulum sweeps of a 15-inch-diam insect beating net taken randomly across each plot. Prior to treatment, potato leafhopper densities were estimated on 9 Jun (Experiment 1). Due to inclement weather, a pre-treatment sweep was not taken for Experiment 2. With the exception of LABS 116 in Experiment 1, all insecticide treatments were applied as foliar sprays on 16 Jun (Experiment 1) and 25 Jul (Experiment 2). LABS 116 was applied in Experiment 1 on 17 Jun as a result of needing an additional product shipment. Cygon 4E was added as a standard insecticide treatment in both Experiments. Alfalfa height at application was 4-6 inches. Insecticides were applied in 25 gal of water per acre at 25 psi with a tractor-mounted sprayer equipped with a 20-ft boom containing 80 degree flat fan nozzles and 50 mesh screens. Leafhopper densities were sampled on 19, 23, 30 Jun and 8 Jul (i.e. 3, 7, 14, 22 DAT) for Experiment 1, and 25 Jul, and 1, 8, 15, 24 Aug (i.e. 3, 7, 14, 21, 30 DAT) for Experiment 2. Densities reported represent the number of adults, number of nymphs, and the combined numbers of adults and nymphs collected per 20 sweeps. Alfalfa yield was determined on 8 Jul (Experiment 1) and 25 Aug (Experiment 2) from a 60-ft2 swath taken from each plot with a Carter Forage Harvester (Carter Mfg. Co. Inc., Brookston, IN). Percent moisture was determined by oven drying a subsample of alfalfa (approximately 2 lb wet). Alfalfa yield is reported as dry weight lb per acre.

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