scholarly journals Northern and Western Corn Rootworm Adult Emergence and Root Injury Ratings Associated with Labeled and Reduced Soil Insecticide Application Rates in Aurora, Sd, 1994

1996 ◽  
Vol 21 (1) ◽  
pp. 213-214
Author(s):  
M. A. Boetel ◽  
B. W. Fuller
Keyword(s):  
Adult Emergence ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Insecticide Application ◽  
Application Rates ◽  
Root Injury

Evaluation of adult emergence and larval root injury for Cry3Bb1-resistant populations of the western corn rootworm

2016 ◽  
Vol 141 (1-2) ◽  
pp. 41-52 ◽  
Author(s):  
P. M. Schrader ◽  
R. E. Estes ◽  
N. A. Tinsley ◽  
A. J. Gassmann ◽  
M. E. Gray
Keyword(s):  
Adult Emergence ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Injury

ROLE OF 2,4-DIHYDROXY-7-METHOXY-1,4-BENZOXAZIN-3-ONE (DIMBOA) IN THE RESISTANCE OF MAIZE TO WESTERN CORN ROOTWORM, DIABROTICA VIRGIFERA VIRGIFERA (LECONTE) (COLEOPTERA: CHRYSOMELIDAE)

1990 ◽  
Vol 122 (6) ◽  
pp. 1177-1186 ◽  
Author(s):  
Y.S. Xie ◽  
J.T. Arnason ◽  
B.J.R. Philogène ◽  
J.D.H. Lambert ◽  
J. Atkinson ◽  
...  
Keyword(s):  
Growth Parameters ◽  
Adult Emergence ◽  
Dry Weight ◽  
Diabrotica Virgifera Virgifera ◽  
Head Capsule ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Fresh Weight ◽  
Growing Seasons

Abstract2,4-Dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), the major hydroxamic acid present in corn root, was studied for its effects on western corn rootworm, Diabrotica virgifera virgifera (LeConte). Exogenously applied DIMBOA caused mortality in western corn rootworm larvae feeding on fresh corn roots. The LC50 (lethal concentration for 50% mortality) value (fiducial limits) was 153 ppm (108–209) and the LC90 value was 917 ppm (560–2297). The deleterious effects of DIMBOA on western corn rootworm larvae possibly are due to both feeding deterrence and toxicity. In a replicated pot trial during two growing seasons, two corn lines developed by Agriculture Canada from CIMMYT collections, ITR 3872 with high DIMBOA content in roots, and NTR-2 Ger. 4042 with low DIMBOA content in roots, were evaluated for resistance to western corn rootworm larvae. The results indicated that the high DIMBOA line (but not the low DIMBOA line) stressed western corn rootworm larvae to produce inferior adults based on the measurement of adult emergence number, adult weight, and adult head-capsule width. The effect of western corn rootworm on both corn lines with different DIMBOA levels was measured based on plant growth parameters including plant height, stem thickness, plant fresh weight, root fresh weight, plant dry weight, and root dry weight. ITR 3872 (high DIMBOA) showed significantly less damage than NTR-2 Ger. 4042 (low DIMBOA) in almost all plant parameters measured. The results suggest that DIMBOA may in some instances contribute to the resistance of corn to western corn rootworm larvae.

Oviposition site selected by the western corn rootworm (Diabrotica virgifera virgifera Leconte) in southern Ontario strip plots

2005 ◽  
Vol 85 (4) ◽  
pp. 949-954 ◽  
Author(s):  
C. C. Knight ◽  
K. P. Pauls ◽  
M. K. Sears ◽  
A. W. Schaafsma
Keyword(s):  
Insect Pest ◽  
Adult Emergence ◽  
Diabrotica Virgifera Virgifera ◽  
Conclusive Evidence ◽  
Western Corn Rootworm ◽  
Egg Laying ◽  
Larval Feeding ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Southern Ontario

Western corn rootworm (WCR), Diabrotica virgifera virgifera L., is the most serious insect pest of corn, Zea mays L., in North America. Crop rotation had successfully controlled this pest until the late 1980s when a new biotype that lays its eggs in non-corn crops was discovered in Illinois. This biotype has spread to parts of Indiana, Michigan, and Ohio, and threatens Ontario. By using emergence cages, Pherocon Am® sticky traps and corn root ratings, egg-laying behaviour of WCR in Ontario was assessed in strip crop settings that represent typical cropping systems of southern Ontario. WCR adults were active in both soybean and winter wheat fields in July and August. Larval feeding and adult emergence in first-year corn fields following soybean and wheat were similar, confirming that oviposition did occur in both crops. These data do not, however, provide conclusive evidence for the presence of the rotation resistant WCR in Ontario because previous studies have demonstrated that WCR are capable of utilizing other crops for oviposition. Key words: Western corn rootworm, Diabrotica virgifera virgifera, strip plots, corn, soybean, wheat (winter)

scholarly journals Western Corn Rootworm Egg Distribution and Adult Emergence Under Two Corn Tillage Systems1

1968 ◽  
Vol 61 (5) ◽  
pp. 1424-1427 ◽  
Author(s):  
K. P. Pruess ◽  
G. T. Weekman ◽  
B. R. Somerhalder
Keyword(s):  
Adult Emergence ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Egg Distribution

scholarly journals Preplant-Incorporated Insecticide Treatments to Manage Northern and Western Corn Rootworm Larvae in Eastern South Dakota, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 161-161
Author(s):  
M. A. Boetel ◽  
B. W. Fuller ◽  
J. M. Jensen ◽  
D. J. Thompson
Keyword(s):  
South Dakota ◽  
Granular Materials ◽  
Linear Models ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Feeding Damage ◽  
Insecticide Application ◽  
Corn Seed ◽  
Application Methods ◽  
Scale Data

Abstract Cornfields were chosen at Aurora and Cavour South Dakota based on corn rootworm egg and adult surveys. Therefore, offering the potential for significant larval pressures during this study. The experiment was conducted to compare efficacy of preplant-incorporation (PPI) with traditional planting-time insecticide application methods (banded or in-furrow) for controlling rootworm larvae. The PPI treatments were applied using a hand-held spray boom equipped with 4 Teejet 8002 nozzles spaced 46 cm apart. Delivery rate was 20 gpa at 25 psi while travelling at 3 mph. Immediately following liquid applications, the soil was tilled with a tandem disk harrow at a 5 to 8 cm depth for insecticide incorporation. Granular materials were applied using Noble metering units on an adapted Kinze 4-row corn planter using band or in-furrow insecticide placement methods. Metering units were calibrated on the planter prior to insecticide applications. Treatment plots (15.25 m long rows spaced 96.5 cm apart) were arranged in a RCBD with 4 replications. Band treatments were applied in an 18-cm swath in front of the furrow-closing wheels, and incorporated by the wheels and drag chains. In-furrow applications consisted of directing granules immediately between double-disk furrow openers. Pioneer TR-3751’ (100-day) corn seed was planted at approximately 23,000 kernels per acre at each location. Five roots per replicate were dug, washed, examined for feeding damage and rated using the Iowa 1 to 6 scale. Data were analyzed with SAS’s General Linear Models procedure, and means were compared using DMRT.

scholarly journals Comparing Populations of Western Corn Rootworm (Coleoptera: Chrysomelidae) in Regions With and Without a History of Injury to Cry3 Corn

2020 ◽  
Vol 113 (4) ◽  
pp. 1839-1849
Author(s):  
Coy R St. Clair ◽  
Graham P Head ◽  
Aaron J Gassmann
Keyword(s):  
Management Strategies ◽  
Diabrotica Virgifera Virgifera ◽  
Western Corn Rootworm ◽  
Management Tool ◽  
Bt Corn ◽  
Corn Rootworm ◽  
Root Injury ◽  
Important Pest ◽  
Bacterium Bacillus ◽  
Management Tactics

Abstract Transgenic corn expressing insecticidal proteins derived from the bacterium Bacillus thuringiensis (Bt) is an important pest management tool. Western corn rootworm, Diabrotica virgifera virgifera LeConte, is a key pest of corn in the midwestern United States that has developed field-evolved resistance to all available Bt traits. The first Bt trait to be commercialized for management of rootworm was Cry3Bb1 in 2003, and field-evolved resistance appeared in 2009. In this study, we examined fields in counties where greater-than-expected injury to Cry3 (Cry3Bb1 or mCry3A) corn roots (>1 node) had previously been reported (problem counties) and counties where injury had not been reported (non-problem counties). Four to eight fields were sampled per county in 2015, 2016, and 2017 to quantify rootworm abundance, root injury, Cry3Bb1resistance, and rootworm management strategies. Rootworm abundance, root injury, and resistance to Cry3Bb1 did not differ between county types. Management tactics differed between county types, with problem counties growing more corn, using more soil insecticide, and growing more Cry34/35Ab1 corn. Additionally, a comparison of root injury to Bt and non-Bt corn within fields indicated that farmers derived an economic benefit from planting Bt corn to manage corn rootworm. Our results suggest that rootworm populations are similar between problem and non-problem counties in Iowa due to similar levels of selection pressure on Cry3 corn, but problem county fields have applied more management tactics due to previous rootworm issues in the area.

scholarly journals Control of Corn Rootworm Larvae in South Dakota Using Planting-Time Soil Insecticide Applications, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 188-188
Author(s):  
M. A. Boetel ◽  
B. W. Fuller ◽  
J. M. Jenson
Keyword(s):  
South Dakota ◽  
Block Design ◽  
Individual Treatment ◽  
Corn Rootworm ◽  
Feeding Damage ◽  
Insecticide Application ◽  
Planting Time ◽  
Application Rates ◽  
Randomized Complete Block Design

Abstract Three studies were conducted at 3 SD sites (Delmont, Garretson, and Sinai) to evaluate insecticide application rates and techniques (hand and in-furrow) for control of NCR and WCR larvae. A randomized complete block design with 4 replications was used in these studies. Individual treatment plots were single 15.25 m long rows spaced 96.5 cm apart. Insecticide granules were applied with modified, ground-driven Noble metering units mounted on a specially-adapted Kinze 4-row corn planter. Metering units were calibrated on the planter prior to insecticide applications. Banded treatments were applied in an 18 cm swath in front of the furrow-closing wheels, and incorporated by the wheels and drag chains. In-furrow applications consisted of directing granules immediately between double disk furrow openers. Corn was seeded at 23,000 kernels per acre at all locations. Five roots per replicate were dug for each treatment. Roots were then washed, examined for feeding damage, and rated using the Iowa 1 to 6 scale.

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