scholarly journals Evaluation of Insecticides for Aphid Control (Trial 1), 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 265-265
Author(s):  
Jack T. Reed ◽  
Michael S. Howell ◽  
C. S. Jackson
Keyword(s):  
Growing Season ◽  
Hollow Cone ◽  
Aphid Control ◽  
High Clearance

Abstract This test was designed to evaluate the effectiveness of insecticides for control of cotton aphids in Mississippi. Plots were 4 rows wide and 50 ft long with four untreated rows or a 10 ft planted buffer between plots. Plants in each plot were sampled on a three to four day interval early in the growing season for cotton aphids by selecting ten random plants in each plot. One leaf from the terminal and one leaf four nodes below the terminal (mid level) were sampled on each plant. The total number of aphids on the top leaves and mid leaves was recorded. Treatment was initiated when population levels were rapidly increasing. Insecticide applications were applied on 23 Jun and 10 Jul with a high clearance spray tractor equipped with two TX4 hollow cone nozzles per row traveling 4 mph and delivering 5 gpa. Plots within a replicate were sprayed sequentially to maintain true replicate integrity. Yield was estimated by mechanically harvesting the center two rows of each plot.

scholarly journals Evaluation of Insecticides for Control of Aphids on Non-Transgenic Cotton, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 238-239
Author(s):  
Michael S. Howell ◽  
Jack T. Reed
Keyword(s):  
Water Samples ◽  
Growing Season ◽  
Transgenic Cotton ◽  
Row Spacing ◽  
Seed Cotton ◽  
Hollow Cone ◽  
Plot Size ◽  
Crop Development ◽  
Extension Center ◽  
High Clearance

Abstract Insecticides were evaluated at North Mississippi Research and Extension Center, Verona, MS, in a RCB design with 4 replications. Plot size was 4 rows wide (38-inch row spacing) by 50 ft long with 4 untreated rows between plots and a 10-ft planted buffer at the end of each plot. Insecticides were applied on 8 and 11 Jul with a high-clearance spray tractor equipped with two Spraying Systems TX4 hollow-cone nozzles per row and calibrated for 5 gpa at a pressure of 40 psi at 4 mph. Carrier of the insecticide was water. Samples were taken from 10 leaves per plot at each of two levels on the plant: upper (first fully expanded leaf), and mid (mainstem leaf located one-third down the plant). Aphids were counted on the underside of each leaf. Throughout the growing season, there was ad-equate rainfall for crop development. Yield (lb of seed cotton per acre) was determined by mechanically harvesting the center two rows of each plot, and measuring the actual area picked.

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 Cotton Aphid Control, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 245-245
Author(s):  
G. W. Elzen
Keyword(s):  
Compressed Air ◽  
Relative Efficacy ◽  
Cotton Aphid ◽  
Aphid Infestation ◽  
Spray System ◽  
Aphid Control ◽  
Spray Volume ◽  
High Clearance

Abstract Treatments were tested for relative efficacy against cotton aphid in nonirrigated cotton planted 5 May at Stoneville, MS. Plots of 8 rows (40 inch centers) by 65 ft, separated by 15 ft alleys, were arranged in a RCBD with 4 replicates. All treatments were applied by a high-clearance spray machine equipped with a compressed air spray system. Total spray volume was 6 gal/acre at 5 mph and 35 psi using 2 TX10 nozzles/row. Plots within a replicate were sprayed consecutively with the boom rinsed twice and blown clear between plots. A pretreatment survey on 19 Jun indicated a moderate aphid infestation. Treatments were applied on 20 and 27 Jun. Efficacy was determined by counting aphids per square inch on leaves in the top and middle portions of 80 randomly chosen plants/treatment at 3 and 6 or 7 DAT.

scholarly journals Control of Southern Armyworm with Bacillus Thuringiensis in Staked Tomato, Fall 1994

1996 ◽  
Vol 21 (1) ◽  
pp. 191-191
Author(s):  
P. A. Stansly ◽  
J. M. Conner
Keyword(s):  
Bacillus Thuringiensis ◽  
Disease Control ◽  
Methyl Bromide ◽  
Natural Populations ◽  
Beet Armyworm ◽  
Hollow Cone ◽  
Southern Armyworm ◽  
Pump Pressure ◽  
Marketable Size ◽  
High Clearance

Abstract Greenhouse raised tomato seedings “Florasette” were planted 8 Sep. 1994, 18 inches within the row on six subirrigated beds, 240 ft long, 32 ft wide on 6 ft centers. Beds had been fumigated with methyl bromide + chloropicrin 67/33 at a rate of 2201b/acre and mulched with whiteside polyethylene. Each of 4, 125 ft blocks was divided into 4, 3-row plots 25 ft long plus 2.5 ft walkways. Plants were sprayed weekly with an alternating combination of Maneb 80 WP at 1 lb/acre plus Kocide 101 at 31b/acre and Bravo 720 at 1.5 pt/acre for disease control. Plants were inoculated on 5 Oct with beet armyworm and on 19 Oct with SAW on 19 Oct to supplement natural populations by applying 2-3 neonates (2-3 per plant) in Grito-O-Cobs (20-40 mesh) to foliage with a “bazooka” gun. Treatments and spray schedules are given in Tables 1 and 2. Spray was delivered weekly for 7 weeks starting in 21 Oct using a high clearance sprayer equipped with yellow hollow cone Albuz nozzles at 200 psi pump pressure. Configuration for the first 4 applications was 9 nozzles per row, one overhead and four each side calibrated to deliver 89 GPA. An additional nozzle per side drop was added for the last 3 applications to deliver 110 GPA. Larval populations were evaluated weekly from 21 Oct to 29 Nov on 6 ft of row from the center of each 3-row plot in two-plant (between-stake) units. Larvae were counted in 3 size categories: small, medium and large but only medium and large are reported. Fruit of marketable size was harvested on 21 Nov & 02 Dec and graded on a commercial table with weights and numbers recorded.

scholarly journals Evaluation of Insecticide Combinations Against Late Season Populations of Bollworms, Tobacco Budworms and Boll Weevils, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 198-198
Author(s):  
J. B. Graves ◽  
J. H. Pankey ◽  
B. R. Leonard ◽  
C. A. White
Keyword(s):  
Test Area ◽  
Tobacco Budworm ◽  
Research Station ◽  
Feeding Damage ◽  
Seed Cotton ◽  
Hollow Cone ◽  
Late Season ◽  
High Clearance

Abstract Six insecticide treatments were evaluated at the Macon Ridge Branch of the Northeast Research Station, Winnsboro, LA, to determine their efficacy in controlling the bollworm/tobacco budworm complex and boll weevils. Cotton was planted 18 Jun in plots consisting of 4 rows (40 inch centers) × 50 ft. Treatments were arranged in a RCBD with 4 replications. Treatments were applied 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 22, 26 Aug and 1 Sep against established populations of bollworms, tobacco budworms (primarily tobacco budworms) and boll weevils. Efficacy of the various treatments against these species was determined on 25, 31 Aug and 7 Sep by examining 50 squares/plot for evidence of feeding damage. Also numbers of larvae per 50 squares were recorded for the bollworm/tobacco budworm complex. The plots were mechanically harvested on 25 Oct to determine seed cotton yields. The test area received 0.57 and 0.20 inches rainfall on 1 and 6 Sep, respectively.

scholarly journals Evaluation of an Insecticide Rescue Treatment Against Bollworm, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 227-228
Author(s):  
J. H. Fife ◽  
B. R. Leonard ◽  
K. D. Torrey ◽  
J. B. Graves
Keyword(s):  
Cotton Seed ◽  
Research Station ◽  
Hollow Cone ◽  
Field Sample ◽  
Rescue Treatment ◽  
Charged System ◽  
Second Procedure ◽  
High Clearance

Abstract The efficacy of selected insecticide treatments was evaluated against an established infestation of BW at the Macon Ridge location of the Northeast Research Station. Cotton seed was planted 29 May in plots consisting of 4 rows (40-inch centers) X 50 ft. Treatments were arranged in a RCB design and replicated 6 times. Applications were made with a high-clearance sprayer and CO2-charged system calibrated to deliver 6 gpa through Teejet TX-8 hollow-cone nozzles (2/row) at 47 psi. Insecticides were applied on 6 Aug. Treatments were evaluated using two methods. In the first, 5 BW larval infested bolls were removed from each plot 2 h after treatment, placed in 20-ml plastic vials, and transported to the laboratory. Mortality of BW larvae was determined at 2 DAT and 4 DAT. In the second procedure, a field sample of 100 random bolls was taken from each plot and examined for damage and live larvae at 5 DAT. Rainfall did not influence the efficacy of these treatments. Data were analyzed with ANOVA and means were separated according to DMRT.

scholarly journals Evaluation of Efficacy of Selected Conventional and Experimental Insecticides and Bt Hybrids for Control of Corn Earworm and European Corn Borer on Sweet Corn, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 99-100
Author(s):  
J. T. Shaw ◽  
R. Weinzierl ◽  
J. W. Finger
Keyword(s):  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Earworm ◽  
Compressed Air ◽  
Hollow Cone ◽  
Corn Hybrids ◽  
Corn Borer ◽  
Chemical Treatments ◽  
Untreated Check ◽  
High Clearance

Abstract The tests were arranged in a RCB design with four replications. Each plot consisted of four rows, each being 30 inches wide and 50 ft long. Thirty-foot-wide alleys were established between the four replications. Insecticides were applied to the middle two rows of each plot, leaving two untreated rows between adjoining plots. Twelve insecticide treatments were compared with two Br-sweet corn hybrids (Heritage Bt and Bonus Bt) and their non-Bt isolines to two untreated controls. The 12 chemical treatments and the two untreated checks were planted with the Silver King variety sweet corn. Two untreated check plots were included in each replication and were averaged for the ANOVA. Treatments were applied very four to five days beginning on 8 Aug at 8% silk. All insecticide treatments were applied with a modified John Deere 6000 high-clearance vehicle (HCV) with a rear-mounted boom. Six Conejet (TX VS-8) hollow-cone nozzles (three per row) were calibrated to deliver 30.1 gpa at 40 psi and a speed of 2.5 mph, utilizing a compressed air system. Four nozzles (two per row) were attached to drops and directed the spray towards the ear zone area, a third nozzle (one per row) was mounted directly over the row with the spray being directed into the whorl (tassel) area.

scholarly journals Evaluation of Insecticide Combinations Against Boll Worm/Tobacco Budworm During Late Season in Louisiana, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 271-272
Author(s):  
K. D. Torrey ◽  
B. R. Leonard ◽  
J. H. Fife ◽  
J. H. Pankey ◽  
J. B. Graves
Keyword(s):  
Test Data ◽  
Treatment Efficacy ◽  
Test Area ◽  
Tobacco Budworm ◽  
Research Station ◽  
Hollow Cone ◽  
Flower Buds ◽  
Late Season ◽  
High Clearance ◽  
Overhead Sprinkler

Abstract This test was conducted at the Macon Ridge location of the Northeast Research Station. Cotton was planted 12 Jun in plots consisting of 4 rows (40 inch centers) X 50 ft. Treatments were arranged in a RCB design, replicated 4 times. Applications were made with a high clearance sprayer calibrated to deliver 6 gpa through Teejet TX-8 hollow cone nozzles (2/row) at 46 psi. Insecticides were applied on 8, 11, 14, 18 Aug and 11 Sep. Treatments were evaluated by examining 50 flower buds (squares) per plot for evidence of BW/TBW damage. The plots were mechanically harvested on 16 Oct to determine seedcotton yields. The test area was irrigated by an overhead sprinkler “as needed” during the season, but not within 48 h of treatment applications. Rainfall was not a factor influencing treatment efficacy in this test. Data were analyzed with ANOVA, and means were separated according to DMRT.

scholarly journals Green Peach Aphid Control With Foliar Sprays, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 171-171
Author(s):  
Robert L. Stoltz ◽  
Nancy A. Matteson
Keyword(s):  
Green Peach Aphid ◽  
Sweet Pepper ◽  
Individual Treatment ◽  
Row Spacing ◽  
Silt Loam ◽  
Hollow Cone ◽  
Aphid Control ◽  
Untreated Check ◽  
Extension Center ◽  
Pepper Plants

Abstract Experimental plots were established on the UI Research and Extension Center, Kimberly, Idaho. Potatoes were planted on 25 Apr and irrigated by solid set sprinkler. The soil type was Portneuf silt loam. Four treatments and one untreated check plot were replicated four times in a RCB design. Individual treatment plots were 4 rows (36 inch row spacing) wide by 25 ft long with 5 ft alleyways separating the plots. Green peach aphids were mass reared on greenhouse sweet pepper plants (California Wonder) for release into individual plots. Aphid releases were made into test plots the last wk in Jun and again in the first wk of Jul. A total of four heavily infested pepper plants was released per plot. Treatment sprays were broadcast applied using a CO2 pressurized backpack sprayer (30 psi) and delivering 20 gal finished spray per acre (four, 10X hollow cone nozzles). Aphid counts were made from non-destructively examining 10 randomly selected leaves in the center two rows of each plot. Leaves were sampled from the top, middle, and bottom sections of the plants. The data collected and presented are the total number of aphids per 20 leaves. On 19 Jul a pre-count was taken and on 21 Jul all treatment applications were made. Data were analyzed using ANOVA and Student-Newman-Keuls multiple means comparison.

scholarly journals Evaluation of Insecticides for Management of Sorghum Midge in Sorghum, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 278-278
Author(s):  
B. A. Castro ◽  
T. J. Riley ◽  
B. R. Leonard
Keyword(s):  
Grain Sorghum ◽  
Research Station ◽  
Silt Loam ◽  
Hollow Cone ◽  
Sorghum Midge ◽  
Damage Data ◽  
Charged System ◽  
Seed Yields ◽  
High Clearance

Abstract Selected insecticides were evaluated for control of sorghum midge in grain sorghum at the Macon Ridge location of the Northeast Research Station near Winnsboro, LA. Grain sorghum was planted in a Gigger-Gilbert silt loam on 6 Jun in 4-row plots (40-inch centers) X 60 ft. Treatments were arranged in a RCB design with four replications. In-secticide treatments were applied with a high clearance sprayer equipped with a CO2 charged system calibrated to deliver 6 gpa at 47 psi through TX-8 hollow-cone nozzles (2/row). All insecticides were applied on 5 Aug when an average of 25% of sorghum plants in the field were at some stage of yellow flowering. Sorghum midge damage to seed heads was evaluated in the field on 5 Sep by visually estimating the percent blasted kernels on each of 20 randomly selected panicles from the 2 center rows per plot. Sorghum seed yields were obtained on 10 Sep by mechanically harvesting the 2 center rows in each plot. Sorghum midge damage data were transformed [arcsin (x/100)] prior to ANOVA and DNMRT. Actual means are presented in the table.

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