Comparison of Western Corn Rootworm (Coleoptera: Chrysomelidae) Adult Populations and Economic Thresholds in First-Year and Continuous Corn Fields1

1983 ◽  
Vol 76 (5) ◽  
pp. 1028-1032 ◽  
Author(s):  
L. D. Godfrey ◽  
F. T. Turpin
Keyword(s):  
Western Corn Rootworm ◽  
First Year ◽  
Corn Rootworm ◽  
Continuous Corn ◽  
Economic Thresholds

Incidence of Western Corn Rootworm Beetles (Coleoptera: Chrysomelidae) on Corn in Virginia from 1987 to 1992

1993 ◽  
Vol 28 (1) ◽  
pp. 136-141 ◽  
Author(s):  
Roger R. Youngman ◽  
Eric R. Day
Keyword(s):  
Crop Rotation ◽  
Diabrotica Virgifera Virgifera ◽  
Western Corn Rootworm ◽  
The State ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Continuous Corn ◽  
Corn Field ◽  
Survey Results ◽  
Diabrotica Virgifera Virgifera Leconte

The discovery of western corn rootworm beetles, Diabrotica virgifera virgifera LeConte, in a southwest Virginia corn field in 1985 prompted annual surveys of corn fields in an average of 28 counties across the state from 1987 to 1992. All counties included in the annual surveys were representative of the major corn-growing regions of Virginia. Survey results indicated that western corn rootworm beetles spread rapidly throughout most of the western and central continuous corn-growing regions of the state. In the eastern and southeastern corn-growing regions of the state, where crop rotation is widely practiced, detections of western corn rootworm beetles were less common and typically involved only one to two counties per year from 1987 to 1992.

Damage determination of western corn rootworm(Diabrotica virgifera virgiferaleconte) in soil disinfected, continuous corn

2007 ◽  
Vol 35 (2) ◽  
pp. 593-596 ◽  
Author(s):  
Sándor Keszthelyi ◽  
Tamás Szabó ◽  
Pál Kurucsai ◽  
Miklós Nádasy ◽  
Zsolt Marczali
Keyword(s):  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
Continuous Corn

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.

Eastward expansion and discovery of the soybean biotype of western corn rootworm (Diabrotica virgifera virgifera LeConte) in Canada

2004 ◽  
Vol 84 (1) ◽  
pp. 305-309 ◽  
Author(s):  
François Meloche ◽  
Paul Hermans
Keyword(s):  
Key Words ◽  
Species Distribution ◽  
Diabrotica Virgifera Virgifera ◽  
Western Corn Rootworm ◽  
First Year ◽  
Corn Rootworm ◽  
Diabrotica Virgifera ◽  
First Report ◽  
Emergence Traps ◽  
Diabrotica Virgifera Virgifera Leconte

The western corn rootworm (WCR), (Diabrotica virgifera virgifera LeConte), was collected in eastern Ontario and western Quebec in 2000. At Ottawa and North Gower, WCR adults were recovered using emergence traps from first-year corn and, at Ottawa, from first year soybean after corn. This constitutes an extension of the species distribution and the first report of WCR developing in soybean in Canada. Key words: Western corn rootworm, Diabrotica virgifera virgifera, distribution, corn, soybean

Risk of Western Corn Rootworm (Coleoptera: Chrysomelidae) Damage to Continuous Corn in Virginia

1997 ◽  
Vol 32 (3) ◽  
pp. 281-289 ◽  
Author(s):  
Thomas P. Kuhar ◽  
Roger R. Youngman ◽  
Curtis A. Laub
Keyword(s):  
Economic Loss ◽  
Diabrotica Virgifera Virgifera ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Damage ◽  
Continuous Corn ◽  
Whole Plant ◽  
Silage Quality ◽  
Plant Yields ◽  
Soil Insecticides

Information on the risk of western corn rootworm, Diabrotica virgifera virgifera LeConte, damage to continuously-grown corn previously was lacking in Virginia, as well as other mid-Atlantic states. A field study was conducted in 1993 and 1994 comparing root damage, whole-plant yields, and silage quality in insecticide-treated and untreated sections of 32 continuous corn fields in Virginia. Approximately 28% of the fields had serious root damage exceeding a rating of 3.5 (1–6 scale) in sections not treated with a soil insecticide. Also, 19% of the fields had an economic loss in whole-plant yield due to corn rootworm feeding damage. Silage quality, as evidenced by percent crude protein and acid detergent fiber, was not significantly affected by corn rootworm feeding. Because much of the continuous corn acreage in Virginia is treated preventively with soil insecticides for corn rootworms, the results of this study suggest that a large percentage of this insecticide use is unnecessary.

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