scholarly journals Corn Rootworm Control, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 177-177
Author(s):  
T. W. Patton ◽  
G. P. Dively ◽  
L. Hellman
Keyword(s):  
Evaluation Studies ◽  
Corn Rootworm ◽  
Root Damage ◽  
No Till ◽  
Percent Moisture ◽  
Bicycle Wheel

Abstract Four liquid insecticide evaluation studies were conducted at three sites in Beltsville, Uniontown, and Burkittsville, MD. Corn was planted no-till on 29 Apr and 15 May at Burkittsville and Beltsville, respectively. Conventionally tilled corn was planted at Uniontown I and II on 29 Apr and 13 May, respectively. Treatment plots were 4 rows × 50 ft arranged in a RCB with 3 replications. Furadan 4 F broadcast was applied with a COz backpack sprayer calibrated to deliver 21 gpa at 40 psi. Force 1.5 G was applied in a 7 inch band over the row with a hand powered bicycle wheel applicator. Both treatments were made at or near planting. Post-planting treatments of Furadan 4F were directed at the base of the plant in a 11 inch band during 8-10 Jun with a CO2 backpack sprayer delivering 12 gpa at 40 psi. Root damage was evaluated during 7- 12 Jun. Six roots were dug, washed, and rated in accordance to the Iowa 1-6 scale. Yields were determined by hand harvesting 50 ft of row. Percent moisture was measured for each plot and used to convert yields to 15.5%.

scholarly journals Corn Rootworm Larval Control, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 219-220
Author(s):  
Arthur A. Hower ◽  
Sandra D. Alexander
Keyword(s):  
Agricultural Research ◽  
Seedling Emergence ◽  
Treatment Plant ◽  
Row Spacing ◽  
Corn Rootworm ◽  
Plant Populations ◽  
No Till ◽  
Insecticide Efficacy ◽  
Percent Moisture ◽  
Rock Springs

Abstract Two insecticide efficacy studies for controlling mixed populations of NCR (17% Experiment I and 42% Experiment II) and WCR (83% Experiment I and 58% Experiment II) were conducted at the Russell E. Larson Agricultural Research Center at Rock Springs, Centre County, PA. The experiments were conducted on separate fields approximately 1 mile apart. Corn was planted no-till on 16 May in both experiments using a John Deere Max-Emerge 2 row planter with 30-inch row spacing. The Lorsban 4E with 9-18-9 fertilizer in solution was applied at each site 22 May. Rain prevented application of this treatment earlier. Insecticides were applied to 5X40 ft plots in a RCB design with 4 replications per treatment. Plant populations were counted 15 Jun at both locations to identify seedling emergence and phytotoxicity that may have resulted from the treatments. Root damage ratings were evaluated 21 Jul (Experiment I) and 25 Jul (Experiment II) using the Iowa 1 to 6 system. Yields were determined in Experiment I as silage using a silage harvester on 12 Sep. One row of corn was harvested per plot and the row harvested was in the same relative position in all plots. Yield in Experiment II was determined by mechanically harvesting each plot for shelled corn on 23 Oct. Percent moisture in the silage plots was determined by drying a subsample (at 2.0 lb wet) from each plot and silage yield was adjusted to 65% moisture. Percent moisture in the shelled corn was determined for each plot with a moisture meter and yield was adjusted to 15.5% moisture.

scholarly journals Control of Western Corn Rootworm Larvae, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 205-205
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Soil Moisture ◽  
Soil Temperature ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Silt Loam ◽  
Hybrid Corn ◽  
Significant Difference ◽  
Bicycle Wheel ◽  
State Scale

Abstract Insecticides were evaluated for rootworm larval suppression in a field composed of Cozad silt loam soils. ‘DeKalb 580’ hybrid corn was ridge planted near North Platte, NE, on 1 May. At the time of planting, soil moisture was adequate for germination. Soil temperature at a depth of 5 cm was about 7°C. Treatments were applied at planting to 5 X 40 ft plots in a RCB design with four replicates. Insecticides were applied with either a planter-mounted “Smart Box” applicator or a bicycle wheel applicator-mounted noble box. On 15 Jul four plants from each plot were collected and the roots were washed. The roots were then rated for rootworm damage using the 1-6 Iowa State scale. Treatment means were analyzed with ANOVA and were separated with Fisher’s protected test of least significant difference.

scholarly journals Corn Rootworm Insecticide Screening, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 221-221
Author(s):  
Keith Jarvi ◽  
Gerald W. Echtenkamp ◽  
John Witkowski
Keyword(s):  
Field Capacity ◽  
Corn Rootworm ◽  
Corn Stalk ◽  
Silt Loam ◽  
Seeding Rate ◽  
Trap Crop ◽  
Planting Time ◽  
Previous Crop ◽  
State 1 ◽  
Bicycle Wheel

Abstract The test plots were planted on 17 May. Seven inch banded (P/TB) and infurrow (P/TF) planting time treatments were applied with a cone-belt distributer mounted on a John Deere Maxemerge equipped with incorporation tines. Cultivation treatments (C/TB) were applied over the row on 22 Jun with the cone-belt distributer mounted on a hand-powered bicycle wheel applicator. The entire plot was cultivated immediately after application of the 22 Jun treatments by a tractor mounted cultivator. The seeding rate was 19,000 seeds/ acre on 30 inch rows. Soil type was silt loam (OM >3%, pH 6.5). Previous crop was late planted corn planted as a trap crop. The field was disked twice prior to planting. Preplant anhydrous ammonia was applied at the rate of 80 lb per acre prior to planting. Approximately 20% corn stalk residue was remaining after field preparation. The experimental design was a RCB with 4 replications, each treatment a single row 47 ft long. Five randomly selected roots from each replication were rated on the Iowa State 1-6 scale (1, no damage; 6, 3 or more nodes pruned to within 1/2 inch of the stalk). The roots were dug and rated on 24, 25, and 26 Jul. Topsoil and subsoil moisture was at field capacity at planting time.

scholarly journals Effects of the Low-Level Western Corn Rootworm Egg Infestation on Maize Plants in the Field

2019 ◽  
Vol 68 (1-2) ◽  
pp. 28-33
Author(s):  
Branka Popović ◽  
Snežana Tanasković ◽  
Sonja Gvozdenac
Keyword(s):  
Statistical Analysis ◽  
Plant Height ◽  
Root Zone ◽  
Western Corn Rootworm ◽  
Root Weight ◽  
Corn Rootworm ◽  
Root Damage ◽  
Number Of Leaves ◽  
Maize Plants ◽  
Positive Correlations

Summary From the economic perspective, the western corn rootworm (WCR), Diabrotica virgifera sp. virgifera (Col., Chrysomelidae), poses the gravest threat to the field maize production in Serbia. The purpose of this study is to examine the impact of WCR larvae on the morphology of maize characters during a low-level artificial egg infestation. A field experiment involving the Serbian cultivar ‘NS-640’ was carried out in Bečej, Vojvodina Serbia, in 2016. In the experimental field, a total of 96 maize plants were selected, marked and arranged in 48 pairs. Each pair consisted of an infested plant (WCR eggs injected in the root zone) and an uninfested plant (distillate water injected in the root zone). The number of leaves, height and stem diameter of the plants observed were recorded. Root damage and root weight were measured and evaluated at the end of the trail. For the purpose of statistical analysis, the non-parametric Kruskal-Wallis one-way analysis of variance and a correlation matrix were used. The statistical analysis performed indicate a highly significant difference in the number of leaves and plant height between the infested and uninfested maize plants examined in July (the third field observation). During the last field inspection, significant differences were recorded only between the stem diameters of the infested and uninfested maize plants. A negative correlation was found to exist between the root damage and root weight of the plant pairs. There were positive correlations between the stem diameter, plant height and number of leaves of the infested plants, whereas positive correlations were found between the root damage and plant height of the uninfested plants.

Evaluating Western Corn Rootworm (Coleoptera: Chrysomelidae) Emergence and Root Damage in a Seed Mix Refuge

2010 ◽  
Vol 103 (1) ◽  
pp. 147-157 ◽  
Author(s):  
A. F. Murphy ◽  
M. D. Ginzel ◽  
C. H. Krupke
Keyword(s):  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Damage

Root Damage by Western Corn Rootworm and Nutrient Content in Maize 1

1985 ◽  
Vol 77 (5) ◽  
pp. 769-774 ◽  
Author(s):  
A. L. Kahler ◽  
A. E Olness ◽  
G. R. Sutter ◽  
C. D. Dybing ◽  
O. J. Devine
Keyword(s):  
Nutrient Content ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Damage

scholarly journals Corn Rootworm Granular Insecticide Performance, No Till Vs Tilled, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 171-171
Author(s):  
Keith Jarvi ◽  
Jerry Echtenkamp ◽  
John Witkowski
Keyword(s):  
Silty Clay ◽  
Corn Rootworm ◽  
Test Plot ◽  
Clay Loam ◽  
Seeding Rate ◽  
Silty Clay Loam ◽  
Trap Crop ◽  
Previous Crop ◽  
No Till ◽  
State 1

Abstract The test plot was planted on 4 May. Banded (7 inch) and in-furrow planting time treatments were applied with a cone-belt distributer mounted on a John Deere Maxemerge equipped with incorporation tines. The seeding rate was 18,000 seeds/acre on 30 inch rows. Soil type was silty clay loam (OM > 3%, pH 6.5). Previous crop was late planted corn planted as a trap crop. The experimental design was a RCB with 4 replications, each treatment a single row 50 ft long. One-half of each treatment block was double disked (tilled) prior to planting (10 to 20% residue cover remaining). The other half was undisturbed (no till) (70-80% residue cover remaining). Treatments were randomized within each one-half block. Preplant anhydrous ammonia was applied at the rate of 90 lb per acre prior to planting. Five randomly selected roots from each replication were rated on the Iowa State 1-6 scale (1, no damage; 6, 3 or more nodes pruned to within Wi inch of the stalk). Twenty roots were rated for each treatment. The roots were dug and rated on 15 Jul. Soil moisture was adequate at planting. Rainfall was adequate through rating time.

scholarly journals Western Corn Rootworm Larval Control, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 183-183
Author(s):  
R. T. Bessin ◽  
L. H. Townsend
Keyword(s):  
Conventional Tillage ◽  
Western Corn Rootworm ◽  
Row Spacing ◽  
Corn Rootworm ◽  
Test Plot ◽  
Continuous Corn ◽  
No Till ◽  
System Data ◽  
Dunnett's Test ◽  
The Uk

Abstract Thirty-one insecticides were applied for control of WCR larvae in no-till and conventional tillage corn. The test plot was planted in a continuous corn field on the UK Spindletop Research Farm on 7 May in a RBD with 3 replicates of no-till and 3 replicates of conventional tillage. Individual plots consisted on single rows, 8 m long, with 96.5 cm row spacing. All plots received Accent 75WDG (0.0313 lb [AI]/acre) on 14 Jun. All insecticide treatments were applied at planting except the 2 Furadan 4F treatments, which were broadcast and banded, respectively on 25 May. Number of lodged plants per plot was recorded 28 Jul. A plant was considered lodged if the angle between the base of the plant and the ground was less than 45°. Root damage ratings were evaluated on 29 Jun by examining 3 plants per plot using the Iowa 1-6 system. Data were subject to ANOVA and treatment means compared to that of the control by Dunnett’s test.

scholarly journals Control of Western Corn Rootworm Larvae in West Central Nebraska, 1992

1994 ◽  
Vol 19 (1) ◽  
pp. 209-209
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Growth Stage ◽  
Rating Scale ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Damage ◽  
Time Of Application ◽  
Field Corn ◽  
West Central ◽  
The Press ◽  
Corn Plants

Abstract Granular insecticides were applied to suppress larval rootworm populations in 2 fields in west central NE. ‘Pioneer 3394’ hybrid field corn was ridge-planted in Field 1 with a John Deere Max-emerge planter, to a non-tilled seed bed on 11 May. Insecticides were applied at planting with insecticide boxes attached to the planter. Three replications of each treatment were arranged in a RCB design. T-band applications were made by applying a 7 inch band of insecticide in front of the press wheel. In-furrow applications were made by applying insecticide directly into the seed furrow. All insecticides were applied at a rate of 1114.5 g (AI)/ha. Field 2 was ridge-planted to ‘Fontanelle 4435’ and ‘Fontanelle 6240’ hybrid field corn with a John Deere Max-emerge planter, to a non-tilled seed bed on 6 May. With the exception of 4 strips, 12 rows in width, Counter 15G was applied at planting with insecticide boxes on the planter at a rate of 1114.5 g (AI)/ha. A granular and a liquid insecticide were applied to untreated strips in Field 2 immediately prior to cultivation on 15 Jun. The field corn plants were in the early whorl stage (growth stage 2) of development at the time of application. The granular application was applied over the whorl of the plants with insecticide boxes attached to a tool bar. The liquid insecticide was applied in a 7 inch band to the base of the plants in total volume of 120 liter/ha at 206,786 Pa (30 psi). Cultivation treatments were applied at a rate of 1114.5 g (AI)/ha. Each treatment in Field 2 was applied to 10 × 4 m plots which were replicated 4 times and arranged in a RCB design. Two blocks of treatments were applied to ‘Fontanelle 4435’ hybrid field corn plants and 2 blocks of treatments were planted to ‘Fontanelle 6240’ hybrid field corn plants. Treatments in both fields were evaluated 13 Jul by rating washed roots, using the 1-6 Iowa Root Damage Rating Scale, of 4 plants from each replicate.

Sign in / Sign up

Export Citation Format

Share Document