Use of the Pherocon AM Trap as a Scouting Tool for Predicting Damage by Corn Rootworm (Coleoptera: Chrysomelidae) Larvae

Hein, Gary L.; Tollefson, J. J.

doi:10.1093/jee/78.1.200

Cited by 48 publications

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“…Because economic losses in maize systems depend on a number of interacting factors, including level of injury from rootworm species, environmental stress, and hybrid Steffey 1998, UriasÐLopez andMeinke 2001), a standard economic injury index has been difÞcult to develop. However, it is generally agreed that a root injury rating corresponding to 0.5 or more on the 0 Ð3 node injury scale can result in economic losses (Hein and Tollefson 1985, Gray and Steffey 1998, OÕNeal et al 2001. Here, Bt maize alone significantly reduced injury from 1.3 to 0.1 nodes on the 0 Ð3 scale (Oleson et al 2005), well below the economic injury index, thus attempting to achieve additional reductions in injury from supplemental insecticides may not offer an economic beneÞt.…”

Section: ϫ5mentioning

confidence: 99%

Effect of Bt Maize and Soil Insecticides on Yield, Injury, and Rootworm Survival: Implications for Resistance Management

et al. 2013

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A 2-yr field experiment was conducted to determine the effects on Diabrotica spp. (Coleoptera: Chrysomelidae) of an insecticidal seed treatment (Poncho 1250, (AI) /clothianidin) and a granular insecticide (Aztec 2.1G, (AI)/tebupirimphos and cyfluthrin) alone and in combination with maize producing the insectidical toxin Cry3Bb1 derived from the bacterium Bacillus thuringiensis (Bt). Yields for Bt maize plots were significantly greater than for non-Bt maize; however, insecticides did not significantly affect yield. Insecticides significantly decreased root injury in non-Bt maize plots, but there were no significant differences in root injury between Bt maize with or without either insecticide. Maize producing the Bt toxin Cry3Bb1 and the soil-applied insecticide Aztec significantly decreased survival of western corn rootworm (Diabrotica virgifera virgifera LeConte), while only Bt maize significantly decreased survival of the northern corn rootworm (Diabrotica barberi Smith & Lawrence). For both species, Bt maize and each of the insecticides delayed emergence. In the absence of density-dependent mortality, Bt maize imposed 71 and 80% reduction in survival on the western corn rootworm and the northern corn rootworm, respectively. The data from this study do not support combining insecticide with Bt maize because the addition of insecticide did not increase yield or reduce root injury for Bt maize, and the level of rootworm mortality achieved with conventional insecticide was likely too low to delay the evolution of Bt resistance. In addition, delays in emergence from Bt maize combined with insecticides could promote assortative mating among Bt-selected individuals, which may hasten resistance evolution. RightsThis article is the copyright property of the Entomological Society of America and may not be used for any commercial or other private purpose without specific permission of the Entomological Society of America.This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/ent_pubs/175BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. ABSTRACT A 2-yr Þeld experiment was conducted to determine the effects on Diabrotica spp. Effect of Bt(Coleoptera: Chrysomelidae) of an insecticidal seed treatment (Poncho 1250, (AI)/clothianidin) and a granular insecticide (Aztec 2.1G, (AI)/tebupirimphos and cyßuthrin) alone and in combination with maize producing the insectidical toxin Cry3Bb1 derived from the bacterium Bacillus thuringiensis (Bt). Yields for Bt maize plots were signiÞcantly greater than for non-Bt maize; however, insecticides did not signiÞcantly affect yield. Insecticides signiÞcantly decreased root injury in non-Bt maize plots, but there were no signiÞcant differences in root injury between Bt maize with or without either insecticide. Maize producing the Bt toxin Cr...

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Section: ϫ5mentioning

confidence: 99%

Effect of Bt Maize and Soil Insecticides on Yield, Injury, and Rootworm Survival: Implications for Resistance Management

et al. 2013

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“…captured per sticky trap per day from Hein and Tollefson (1985) as the level of pest abundance capable of causing root-injury ratings the following year of 0.5 on the node-injury scale of Oleson et al (2005). For rotation-resistant D. v. virgifera in soybean Þelds, we estimated I from OÕNeal et al (2001) where 4.7 D. v. virgifera captured per sticky trap per day could be capable of producing a 0.5 root-injury rating the following year.…”

Section: Methodsmentioning

confidence: 99%

“…Two Þeld sites were established within each county intersected by transects. Each Þeld site was composed of a Þrst-year cornÞeld (i.e., the Þeld had been planted to soybeans during the previous season) to measure total abundance of D. barberi and D. v. virgifera at the site, and an adjacent soybean Þeld Hein and Tollefson (1985) and OÕNeal et al (2001) (Table 2). Sticky traps were divided between two transects running throughout each Þeld.…”

Section: Methodsmentioning

confidence: 99%

“…The number of sticky traps per Þeld was reduced in 2009 to enable the sampling of more Þelds per site and to enable the use of emergence cages (Table 2). Fewer traps in a Þeld may increase the variance among samples periods and sites (Hein and Tollefson 1985), however, as few as four traps per Þeld was shown to be as effective as 12 traps at predicting larval injury from Diabrotica spp. (OÕNeal et al 2001).…”

Section: Methodsmentioning

confidence: 99%

“…Average captures exceeding six adult Diabrotica spp. per sticky trap per day are indicative of economic damage to corn the following year (Hein and Tollefson 1985). However, these economic thresholds may not accurately predict economic injury in current corn production systems because agricultural practices, commodity process, and input cost have changed over time.…”

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Abundance and Distribution of Western and Northern Corn Rootworm (<I>Diabrotica</I> spp.) and Prevalence of Rotation Resistance in Eastern Iowa

Dunbar

Gassmann

2013

jnl. econ. entom.

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The western corn rootworm Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae) and the northern corn rootworm Diabrotica barberi Smith & Lawrence (Coleoptera: Chrysomelidae) are major pests of corn (Zea mays L.). Historically, crop rotation has been an effective management strategy, but both species have adapted to crop rotation in the Midwest. For both species in eastern Iowa, we measured abundance and prevalence of rotation resistance using sticky traps and emergence cages in fields of corn and soybean (Glycine max L.). Based on currently available data, we calculated the economic thresholds for these pests at two Diabrotica spp. per trap per day in cornfields and 1.5 D. v. virgifera per trap per day in soybean fields. The economic injury level of rotation-resistant D. barberi was determined to be 3.5 adult insects per emergence cage per year. Peak abundance of rootworm adults in cornfields was below economic thresholds in the majority of fields sampled, suggesting that management of rootworm larvae in continuous cornfields may not always be necessary. Rotation-resistant D. barberi was found throughout eastern Iowa using emergence cages in first-year cornfields, however, the abundance was below levels expected to impose economic injury in 14 of 17 fields evaluated. The presence of rotation-resistant D. v. virgifera, as measured by the occurrence of this insect in soybean fields, occurred only in northeastern Iowa and was also below the economic threshold. These data suggests that crop rotation remains a viable pest management strategy in eastern Iowa.

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Microbial control of insect pests of corn

Lewis

Bruck

Jackson

2007

Field Manual of Techniques in Invertebrate Pathology

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Use of the Pherocon AM Trap as a Scouting Tool for Predicting Damage by Corn Rootworm (Coleoptera: Chrysomelidae) Larvae

Cited by 48 publications

References 0 publications

Effect of Bt Maize and Soil Insecticides on Yield, Injury, and Rootworm Survival: Implications for Resistance Management

Effect of Bt Maize and Soil Insecticides on Yield, Injury, and Rootworm Survival: Implications for Resistance Management

Abundance and Distribution of Western and Northern Corn Rootworm (<I>Diabrotica</I> spp.) and Prevalence of Rotation Resistance in Eastern Iowa

Microbial control of insect pests of corn

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