Edaphic and Agronomic Charactes that Affect Potential for Rootworm Damage to Corn in Iowa12

Turpin, F. T.; Dumenil, Lloyd; Peters, Don C.

doi:10.1093/jee/65.6.1615

Cited by 45 publications

(36 citation statements)

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“…However, as observed with the sticky trap data, WCR feeding in first-year corn was below the economic threshold of 3.0 using the Iowa 1-6 scale (Hills and Peters 1971;Turpin et al 1972). While firstyear corn root damage was below threshold, damage in continuous corn averaged 2.9 on the Iowa scale, and this bordered on the economic threshold of 3.0.…”

Section: Discussionsupporting

confidence: 50%

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

Knight¹,

Pauls²,

Sears³

et al. 2005

Can. J. Plant Sci.

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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)

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Section: Discussionsupporting

confidence: 50%

“…Sticky traps were not placed in corn plots in this study. Ten corn roots were taken from around each cage and rated using the Iowa scale (1-6) after the root systems were washed with water (Turpin et al 1972). Traps were inspected weekly and replaced biweekly.…”

Section: Methodsmentioning

confidence: 99%

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

Knight¹,

Pauls²,

Sears³

et al. 2005

Can. J. Plant Sci.

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“…However, if reduced insecticide performance can be expected because of high organic matter content in soils occurring in low-lying areas, then the reduced adult corn rootworm emergence in low-lying areas of both the treated and the untreated fields of this study may have been the result of factors other than insecticide action, such as aggregated oviposition based on soil or other environmental factors. Turpin et al (1972) considered soil drainage among the significant edaphic factors that mediated rootworm infestation potential in their prediction equation for rootworm damage. They also concluded that predictive methods could be used to identify fields likely to require treatment.…”

Section: Resultsmentioning

confidence: 99%

Geostatistical Characterization of the Spatial Distribution of Adult Corn Rootworm (Coleoptera: Chrysomelidae) Emergence

Ellsbury¹,

Woodson²,

Clay³

et al. 1998

Environmental Entomology

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“…The lack of a significant difference in rootworm survival between soil types suggests that potential differences in soil physical properties between soil types did not significantly influence rootworm population dynamics in this study. Soil factors that could vary by soil type that have been shown to affect WCR egg survival, larval establishment, or larval survival and movement in the soil (i.e., texture, porosity, moisture, compaction, etc., Turpin et al 1972;MacDonald and Ellis 1990;Beckler et al 2004;Meinke et al 2009), did not appear to significantly impact the results of this study in an irrigated system.…”

Section: Discussionmentioning

confidence: 54%

Influence of calcareous soil on Cry3Bb1 expression and efficacy in the field

Wangila

Wang

et al. 2017

Transgenic Res

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Greater than expected injury by western corn rootworm (WCR) (Diabrotica virgifera virgifera LeConte) to Cry3Bb1 expressing maize hybrids (Zea mays L.) has been reported in southwestern Nebraska. Affected areas of some fields are often associated with high pH calcareous soils where maize growth is poor and iron chlorosis is common. As part of a comprehensive study to understand potential causes of unexpected injury, experiments were conducted during 2013 and 2014 to ascertain whether the calcareous soil conditions and associated poor maize growth negatively affect the expression of Cry3Bb1. Quantitative determination of Cry3Bb1 protein expression levels in root tissues was carried out on plants at V5-V6 growth stage using the enzyme-linked immunosorbent assay. Cry3Bb1 and non-Bt near isoline maize hybrids were artificially infested with Cry3Bb1-susceptible WCR eggs to measure survival and efficacy of Cry3Bb1 maize in calcareous and noncalcareous soils. Results showed that there was not a significant difference in expression of Cry3Bb1 protein between plants from calcareous and non-calcareous soils (18.9-21.2 μg/g fresh weight). Western corn rootworm survival was about sevenfold greater from the non-Bt isoline than Cry3Bb1 maize indicating that Cry3Bb1 performed as expected when infested with a Cry3Bb1 susceptible rootworm population. When survival from calcareous and non-calcareous soils was compared, no significant differences were observed in each soil. A significant positive correlation between soil pH and expression of Cry3Bb1 protein in roots was detected from samples collected in 2014 but not in 2013. No such correlation was found between soil pH and survival of WCR. Results suggest that Cry3Bb1 expression levels were sufficient to provide adequate root protection against WCR regardless of soil environment, indicating that lowered Cry3Bb1 expression is not a contributing factor to the greater than expected WCR injury observed in some southwestern Nebraska maize fields.

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Edaphic and Agronomic Charactes that Affect Potential for Rootworm Damage to Corn in Iowa12

Cited by 45 publications

References 0 publications

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

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

Geostatistical Characterization of the Spatial Distribution of Adult Corn Rootworm (Coleoptera: Chrysomelidae) Emergence

Influence of calcareous soil on Cry3Bb1 expression and efficacy in the field

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