scholarly journals The Effect of Adjuvants on Foliar Insecticide Efficacy Against Thrips in Cotton, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 250-250
Author(s):  
J. H. Fife ◽  
B. R. Leonard ◽  
K. D. Torrey
Keyword(s):  
Delivery System ◽  
Cotton Seed ◽  
Compressed Air ◽  
Research Station ◽  
Silt Loam ◽  
Seedling Disease ◽  
Insecticide Efficacy ◽  
Whole Plant

Abstract Cotton seed was planted in a Gigger silt loam on 11 May at the Macon Ridge location of the Northeast Research Station. The seed was treated with Orthene 80S (8 oz form/cwt seed) and Terraclor Super X (10 lb form/acre) was applied at planting to reduce seedling disease problems. Plots in this test consisted of 2 rows (40 inch centers) X 25 ft. Treatments were arranged in a RCB with 4 replications. Insecticides were applied with a tractor mounted boom equipped with compressed air delivery system calibrated to deliver 10 gpa through Teejet TVS 8001 flat fan nozzles (2/row) at 38 psi. Plots were treated on 25 May and sampled on 28 May (3 DAT), 30 May (5 DAT) and 1 Jun (7 DAT). Treatments were evaluated by randomly collecting 10 plants in each plot and processing samples with whole plant washing procedures. These plots received 0.23 inches of rainfall on 31 May and 0.58 inch of rainfall on 1 Jun. Data were analyzed with ANOVA, and means were separated according to DMRT.

Chinch Bug Management with Foliar Insecticides in Field Corn, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 195-195
Author(s):  
J. H. Fife ◽  
B. R. Leonard ◽  
K. D. Torrey ◽  
T. J. Riley ◽  
B. A. Castro
Keyword(s):  
Organic Matter ◽  
Delivery System ◽  
Untreated Control ◽  
Research Station ◽  
Silt Loam ◽  
Corn Seed ◽  
Chinch Bug ◽  
Field Corn ◽  
Corn Plants ◽  
Bug Management

Abstract The efficacy of selected insecticide treatments was compared with that of an untreated control at the Macon Ridge location of the Northeast Research Station near Winnsboro, LA. Corn seed was planted in a Gigger silt loam (pH = 6.1, 1.1% organic matter) on 27 Mar in 2-row plots (40 inch centers) X 40 ft. Treatments were arranged in a RCB design with four replications. Treatments were applied with a handboom and a CO2-charged delivery system calibrated to deliver 10 gpa through 8002 flat-fan nozzles (2/row) at 28 psi. Insecticides were applied on 14 May to V5 stage corn plants. Ten plants/plot were randomly chosen for sampling on 16 and 20 May. Total numbers of chinch bugs were recorded by visually examining mainstems of the plant and leaf sheaths. Data were analyzed with ANOVA and means were separated according to DMRT. Rainfall did not influence the results of this test.

scholarly journals Evaluations Of Square Damage On Bollgard (Bt) Cotton, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 422-423
Author(s):  
Gene Burris ◽  
Don Cook ◽  
B. R. Leonard ◽  
J. B. Graves ◽  
J. Pankey
Keyword(s):  
Plant Height ◽  
Cotton Seed ◽  
Methyl Parathion ◽  
Boll Weevil ◽  
Compressed Air ◽  
Bt Cotton ◽  
Silt Loam ◽  
Population Densities ◽  
Loam Soil ◽  
Height Data

Abstract Plots were four rows (40-inch spacing) wide X 30 feet long and consisted of a randomized complete design with 4 replications. Cotton seed was planted on 15 May on a Commerce silt loam soil which was sidedress fertilized with 90 lb N/acre. Cotton seed was planted with a John Deere model 7100 series planter equipped with 10 inch seed cones mounted to replace the seed hoppers. The seed rate was 4 seeds/row ft. The granular in-furrow treatment (Temik 15G, 0.5 lb Al/acre) was applied with 8 inch belt cone applicators mounted to replace the standard granular applicators. Terraclor Super-X 2E, 2 quarts formulated/acre, was applied with a compressed air sprayer system attached to 2501 nozzles on the planter. The spray tips were positioned to thoroughly cover the sides and bottom of the seed furrow and were calibrated to deliver 5 GPA finished spray. Stand and plant height data were taken on 16 Jun (data not shown). BWTBW treatments (H. spp.) were applied to Coker 312 (Spray/H. spp.) and Bollgard­ (Spray/8%) on 17 Jul and 2, 10, 17, 24, and 31 Aug. Square and terminal infestation ratings were taken (larvae/25) on 3, 12, 17, 20, 24, 26 Jul and 1, 3, 9, and 14 Aug. Boll damage and foliage damage ratings were taken on 29 Aug. The test was conducted in the presence of high boll weevil population densities. Eight overspray treatments were used to control aphids, plant bugs, and boll weevils in all plots as follows: Provado 1.6F + Vydate 3.77L, 0.04 + 0.25 lb Al/acre, (20 June); Bidrin 8E + Ovasyn 1.5E, 0.4 + 0.25 lb Al/acre, (28 June); Guthion 2L, 0.25 lb Al/acre, (10 July); andMethyl parathion 4E, 0.33 lb Al/acre, (12 July); Methyl parathion 4E, 0.33 lb Al/acre, (28 July and 12, 18 August). Bollgard­ threshold treatments 2% and 5% were sprayed with Karate IE + Larvin 3.2F at 0.033 + 0.25 lb Al/acre on 10 August. Bollgard­ threshold treatments 2%, 5% and 8% were sprayed wit Baythroid 2E + Curacron 8E + Larvin 3.2Fat 0.04 + 1.0 + 0.4 lb Al/acre respectively (17 Aug). All Bollgard­ threshold treatments were sprayed with Methyl parathion 4E + Pirate 3SC + Curacron 8E at 0.33 + 0.25 + 1.0 lb Al/acre on 24 Aug.

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.

Evaluation of Thrips Densities in At-Planting Seed and Soil Treatments on Gigger Silt Loam, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 245-245
Author(s):  
D. R. Cook ◽  
E. Burris ◽  
B. R. Leonard ◽  
J. B. Graves
Keyword(s):  
Cotton Seed ◽  
Silt Loam ◽  
Seed Cotton ◽  
Seeding Rate ◽  
Spray System ◽  
Whole Plant ◽  
The Press ◽  
Major Pest ◽  
Loam Soil ◽  
Spray Control

Abstract Plots were replicated four times in a RCB design and were four rows wide (40 inch spacing) X45 ft. Stoneville 474 cotton seed of the same seed lot was planted on a Gigger silt loam soil on 7 May. The seeding rate was 4 seed/row ft. Cotton seed was planted with a John Deere 7300 series planter which was equipped with 10 inch seed cones mounted to replace the seed hoppers. Granular in-furrow treatments were applied with standard granular applicators. In-furrow spray treatments were applied with a CO2 charged spray system through 25015 nozzles (1/row) mounted in front of the press wheels. The spray tips were turned to spray across the furrow and calibrated to deliver 5 gpa finished spray. Control of thrips was assessed by randomly selecting 5 plants per plot on 20, 24, 28, and 31 May and 5 and 9 Jun. Plant samples were processed by using whole plant washing procedures to remove insects. Major pest and/or secondary pest control was initiated in Jun and continued on an “as needed” basis through Aug. Percentage of open bolls was determined by counting all open and unopened bolls within a 3.0 m section of a center row on 18 Sep. Plots were harvested on 26 Sep and 10 Oct. These data were subjected to appropriate calculations to determine percent first harvest. The center two rows were mechanically harvested using a John Deere spindle type picker. Yields were converted to lbs seed cotton/acre.

RELATIONSHIPS AMONG WHOLE-PLANT MOISTURE, GRAIN MOISTURE, DRY MATTER YIELD, AND QUALITY OF WHOLE-PLANT CORN SILAGE

1975 ◽  
Vol 55 (1) ◽  
pp. 77-84 ◽  
Author(s):  
T. B. DAYNARD ◽  
R. B. HUNTER
Keyword(s):  
Moisture Content ◽  
Dry Matter ◽  
Yield Potential ◽  
In Vitro Digestibility ◽  
Research Station ◽  
Whole Plant ◽  
Grain Moisture ◽  
Plant Moisture ◽  
Plant Moisture Content

Identical experiments were conducted at the Elora Research Station, near Guelph, Ontario in 1970 and 1971 with the objective of determining the relationships among whole-plant dry matter (DM) yield, whole-plant moisture content, and grain moisture content of corn (Zea mays L.) during the later part of the growing season. Each experiment involved eight commercial hybrids representative of the range in maturity, endosperm type, lodging resistance, and grain yield potential of corn hybrids grown commercially in central Ontario. The hybrids were sampled at weekly intervals over an 8-wk period beginning approximately 1 September; the sampled plants were divided into their leaf, stalk, husk, ear and grain components and oven-dried. Fresh and dry weights were used to calculate dry matter (DM) yields and "at harvest" moisture contents of the various components, and of the entire plant. Averaged across the eight hybrids, maximum DM yield was attained at whole-plant moisture content of 66–70%, and a grain moisture content of 45–50%. Among hybrids, 66% whole-plant moisture corresponded to a range in grain moisture content from 41 to 47%. Two additional experiments were grown also at Elora in 1970 and 1971 to evaluate the effects of harvest date on the DM yield and in vitro digestibility of corn plants and their component plant parts. Each experiment involved four representative commercial hybrids which were sampled at four equal time intervals during the month of September, and divided into grain, cob, husks (including shank) and stover (including leaves, leaf sheaths, stalks and tassels) for dry weight and in vitro digestibility measurement. Whole-plant DM digestibility was essentially constant over a range of whole-plant moisture from 76 to 56% in 1970, and from 76 to 64% in 1971. The consistency of whole-plant digestibility was the result of compensating changes in component yield and digestibility. A decrease in the digestibility of the stover, husks and cob with delayed harvest was compensated for by an increase in the proportion of grain in the whole-plant yield.

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 Impact of Cover Crop and At-Planting Insecticide on Thrips Populations, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 247-248
Author(s):  
D. R. Cook ◽  
E. Burris ◽  
B. R. Leonard ◽  
J. B. Graves
Keyword(s):  
Cover Crop ◽  
Cotton Seed ◽  
Seeding Rate ◽  
Vegetation Control ◽  
Spray System ◽  
No Till ◽  
Whole Plant ◽  
The Press ◽  
Major Pest ◽  
Plot Design

Abstract Plots were replicated four times in a split plot design and were four rows (40 inch spacing) X45 ft. Stoneville 474 cotton seed of the same seed lot was planted on 7 May on a Sharkey clay soil which was fertilized with 90 lb N/acre. Cotton seed was planted no-till with a John Deere 7100 series planter which was equipped with 10 inch-seed cones mounted to replace the seed hoppers. The seeding rate was 4 seed/row ft. Granular in-furrow treatments were applied with 8-inch belt cone applicators mounted to replace the standard granular applicators. In-furrow spray treatments were applied with a CO2 charged spray system through 25015 nozzles (1/row) mounted in front of the press wheels. The spray tips were turned to spray across the furrow and calibrated to deliver 5 gpa finished spray. Cover crop treatments consisted of winter wheat and native winter vegetation. Control of thrips was assessed by randomly selecting 5 plants per plot on 21 and 28 May and 7 Jun. Plant samples were processed by using whole-plant washing procedures to remove insects. Major pest and/or secondary pest control was initiated in Jun and continued on an “as needed” basis through Aug

scholarly journals Evaluation of the Fermentation Byproduct Spinosad and Conventional Insecticide Treatments for Controlling Sunflower Beetle Larvae, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 324-324
Author(s):  
M. A. Boetel ◽  
B. W. Fuller ◽  
R. J. Braun
Keyword(s):  
South Dakota ◽  
Linear Models ◽  
Test Area ◽  
Individual Treatment ◽  
North Central ◽  
General Linear Models ◽  
Insecticide Efficacy ◽  
Whole Plant ◽  
Spray Volume ◽  
Central South

Abstract A commercial sunflower field near Mina, in north-central South Dakota, was selected foi our trial of several insecticide treatments at standard and reduced rates for management of SB larvae. The experiment was arranged in a RCBD with 4 replications, and individual treatment plots were 25 ft long by 10 rows (38 inch spacing) wide. In addition, each plot was bordered by two buffer rows to prevent drift. Pre-application evaluations were carried out using whole-plant visual counts of the number of live SB larvae per plant. Twenty plants were examined from each treatment plot and these counts indicated an average of 11 SB larvae per plant within the test area. Treatments were applied on 11 Ju’ using a CO2-propelled backpack sprayer system with a hand-held 6.7-ft long boom. The boom was equipped with 4 TeeJet 8001 nozzles spaced 20 inches apart, and was calibrated to deliver a spray volume of 15 gpa while traveling at 3 mph. Insecticide efficacy was evaluated at 6 DAT using the same count ing technique and number of samples described for pre-application sampling. Data were analyzed with SAS’ s General Linear Models procedure and means were compared using DMRT.

scholarly journals Evaluations of In-Furrow Insecticides and Fungicides, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 241-241
Author(s):  
Gene Burris ◽  
Don Cook ◽  
B. R. Leonard ◽  
J. B. Graves ◽  
J. Pankey
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Plant Height ◽  
Pest Control ◽  
Cotton Seed ◽  
Stand Density ◽  
Research Station ◽  
Area Index ◽  
Seed Rate

Abstract The test was conducted at the Northeast Research Station in St. Joseph, LA. Plots were replicated 4 times in a RCB design and were four rows (40-inch spacing) X 65 ft. ‘Stoneville LA 887’ cotton seed was planted 2 and 3 May on a commerce silt soil which was fertilized sidedress with 90 lb N/acre. Cotton seed were planted with a John Deere model 7100 series planter which was equipped with 10 inch seed cones mounted to replace the seed hoppers. The seed rate was 4 seed/row ft. Granular in-furrow treatments were applied with 8 inch belt cone applicators mounted to replace the standard granular applicators. Control of thrips and aphids was evaluated on 5 randomly selected plants/plot. Evaluations were made on 18, 19, 24, 26, and 29 May and 8 Jun. Plant height counts were taken on 10 randomly selected plants/plot on 8 Jun. Stand density and leaf area was determined by counting the number of plants in a randomly selected meter on 29 May. Leaf area was recorded using a Li Cor leaf area machine. The data was recorded as cm2 and converted to a leaf area index (LAI). Major pests and/or secondary pest control was initiated in Jun and continued on an “as needed” basis through Aug.

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.

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