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 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 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 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 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.

Characteristics of Leeward Shear Layer Structure of Hollow-Cone Spray in Gaseous Crossflow

AIAA Journal ◽  
2021 ◽  
Vol 59 (1) ◽  
pp. 405-409
Author(s):  
Haibin Zhang ◽  
Shilin Gao ◽  
Bofeng Bai ◽  
Yechun Wang
Keyword(s):  
Shear Layer ◽  
Layer Structure ◽  
Hollow Cone ◽  
Hollow Cone Spray
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