Toxicity of Bacillus Thuringiensis Products Against Budworm and Bollworm in Cotton, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 236-236
Author(s):  
W. J. Moar ◽  
R. McCollum ◽  
R. Smith
Keyword(s):  
Bacillus Thuringiensis ◽  
Hollow Cone ◽  
Water Ph ◽  
Microbial Treatments ◽  
High Clearance

Abstract Cotton was planted 23 Apr at the Wiregrass Experiment Substation in Headland, AL, in 8 row plots (36 inch centers) × 75 ft long with 25 ft alleys. Treatments were arranged in a RCBD with 4 replications. Applications were made with a high-clearance sprayer to deliver 8 gal/acre using TeeJet TX10 hollow cone tip nozzles on 18-inch spacing at 55 psi at 5 mph. Water pH was 7.2-7.4 and Prime Oil was used as a spreader/sticker at recommended rates. Foliar treatments were applied 4 times (16, 22 Jun and 9, 13 Jul) followed by 6 weekly applications of Karate starting 21 Jul in order to preserve the results of the microbial treatments. Treatments were evaluated 4 times (21, 25 Jun and 12, 16 Jul) at 3-5 DAT for the presence of eggs, larvae, and terminal damage by sampling 25 terminals in the middle 4 rows/plot. Yields were taken by mechanically harvesting the middle 2 rows/plot on 22 Oct.

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 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 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 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.

scholarly journals Control of Fall Armyworm and Corn Earworm with Chemical and Biological Insecticides in Florida Sweet Corn, Fall 1994

1996 ◽  
Vol 21 (1) ◽  
pp. 113-114
Author(s):  
P.A. Stansly ◽  
J.M. Conner
Keyword(s):  
Bacillus Thuringiensis ◽  
Sweet Corn ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Diaphragm Pump ◽  
High Clearance

Abstract The efficacy of azadirachtin formulations alone and in combination with Bacillus thuringiensis var. aizawai, two formulations of cyhalothrin, and Lannate were compared. Six polyethylene-mulched beds 32 inches wide configured in 2 sets of 3 on 6 ft centers separated by a 15 ft drive middle were planted on 29 Aug in double rows 12 inches between rows and plants. The center bed was used as an untreated source of inoculum and the remaining beds divided into 33 ft plots and assigned treatments in a RCBD with 7 treatments and 4 replications. Whorls of all plants were inoculated with 1-2 neonate fall armyworm larvae on 5 Oct using a bazooka gun and Grito-O-Cobs at 24-4O mesh. Treatments were applied weekly for 6 weeks beginning 7 Oct using a high clearance sprayer configured with 1 overhead nozzle per row equipped with a diaphragm pump operating at 200 psi and calibrated to delivery 21 gpa at 2.5 mph. APSA 80 was tank mixed with Karate and Lannate treatments at 5 oz/100 gallon. The dispersants Petro and Morwet were added to 25% of the spray water at a rate of 0.38 gram of 3% microencapsulated azadirachtin (WRC7305) and mixed for 3 minutes before adding remaining water containing the adjuvant B-1956 at 2 oz/gal. Feeding on inner 3 whorl leaves or tassel was rated weekly for 16 plants on a scale of 1 to 6 corresponding to 0, >1%, 2-5%, 6-10%, 11-30%, and >30% damage respectively. The same 16 plants per plot were harvested twice and number and ears evaluated for weight and marketability. Culls were evaluated as to cause of damage and larvae identified and counted. In addition, 10 stalks from each plot were opened to search for borers but none were found.

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

1996 ◽  
Vol 21 (1) ◽  
pp. 271-271
Author(s):  
K. D. Torrey ◽  
B. R. Leonard ◽  
J. H. Fife ◽  
J. B. Graves
Keyword(s):  
Cotton Seed ◽  
Boll Weevil ◽  
Test Area ◽  
Tobacco Budworm ◽  
Research Station ◽  
Seed Cotton ◽  
Hollow Cone ◽  
Flower Buds ◽  
Damage Data ◽  
High Clearance

Abstract The efficacy of selected insecticides was evaluated against BW/TBW at the Macon Ridge location of the Northeast Research Station. Cotton seed was planted 12 Jun in plots consisting of 4 rows (40 inch centers) X 50 ft. Treatments were arranged in a RCB design and 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 on 11, 14, 22 Aug for evidence of BW/TBW and boll weevil damage. Data reported for boll weevil represent a mean across all sample dates. The plots were mechanically harvested on 16 Oct to determine seed cotton yields. The test area was irrigated by an overhead sprinkler “as needed” during the season, but not within 48 h of treatment applications. Rainfall did not influence the effects of these treatments. Data were analyzed with ANOVA, and means were separated according to DMRT.

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.

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