Effect of Four Cropping Systems on Variant Western Corn Rootworm (Coleoptera: Chrysomelidae) Adult and Egg Densities and Subsequent Larval Injury in Rotated Maize

Schroeder, Jared B.; Ratcliffe, Susan T.; Gray, Michael E.

doi:10.1093/jee/98.5.1587

Cited by 21 publications

(13 citation statements)

References 19 publications

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“…several soil sampling studies suggest that rotationresistant females lay their eggs in multiple crops, but mostly in corn and soybean Þelds (Rondon and Gray 2004, Schroeder et al 2005, Pierce and Gray 2006. Results of this laboratory study support that suggestion; rotation-resistant females will lay eggs in both corn and soybean.…”

Section: Discussionsupporting

confidence: 75%

“…Both behavioral types of females, however, responded similarly to tactile cues for Þne-scale placement of eggs. Previous Þeld studies on oviposition of rotation-resistant populations suggest that egglaying is indiscriminate (Rondon and Gray 2004, Schroeder et al 2005, Pierce and Gray 2006. Ovipositional choice in rotation-resistant females may not really be because of choice per se, but rather because of the fact that females lay their eggs wherever they happen to be, so that oviposition in soybean Þelds or elsewhere outside of corn occurs because they spend more time away from cornÞelds (Spencer and Levine 2008) and minimally acceptable egg-laying sites are still widely available.…”

Section: Discussionmentioning

confidence: 99%

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Oviposition Behaviors in Relation to Rotation Resistance in the Western Corn Rootworm

Knolhoff

Glas

Spencer³

et al. 2010

env. entom.

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Across a large area of the midwestern United States Corn Belt, the western corn rootworm beetle (Diabrotica virgifera virgifera LeConte, Coleoptera: Chrysomelidae) exhibits behavioral resistance to annual crop rotation. Resistant females exhibit increased locomotor activity and frequently lay eggs in soybean (Glycine max L.) fields, although they also lay eggs in fields of corn (Zea mays L.) and other locations. The goals of this study were (1) to determine whether there were any differences in ovipositional behavior and response to plant cues between individual rotation-resistant and wild-type females in the laboratory and (2) to examine the roles of, and interaction between, host volatiles, diet, and locomotor behavior as they related to oviposition. Because rootworm females lay eggs in the soil, we also examined the influence of host plant roots on behavior. In the first year of the study, rotation-resistant beetles were significantly more likely to lay eggs in the presence of soybean foliage and to feed on soybean leaf discs than wild-type females, but this difference was not observed in the second year. Oviposition by rotation-resistant females was increased in the presence of soybean roots, but soybean herbivory did not affect ovipositional choice. Conversely, ovipositional choice of wild-type females was not affected by the presence or identity of host plant roots encountered, and wild-type females consuming soybean foliage were more likely to lay eggs.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Oviposition Behaviors in Relation to Rotation Resistance in the Western Corn Rootworm

Knolhoff

Glas

Spencer³

et al. 2010

env. entom.

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“…; Schroeder et al. ), although we do not have site histories for each of these farms at this point. Rootworm adult populations have been shown to be correlated with subsequent year's larval populations and root damage (Tollefson ), making our sampling approach a meaningful metric for producers.…”

Section: Discussionmentioning

confidence: 99%

Spatial and numerical relationships of arthropod communities associated with key pests of maize

Lundgren

McDonald

Rand

et al. 2015

J Applied Entomology

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Pest management largely focuses on managing individual pest species with little concern for the diverse communities that co-occur with key pests and potentially shape their population dynamics. During anthesis, we described the foliar arthropod communities on 53 maize farms throughout the region of eastern South Dakota. The resulting communities were examined for trends in local associations in the abundances of taxa with key pests in the system (rootworms [Diabrotica spp.], European corn borers [Ostrinia nubilalis], aphids and Western bean cutworm [Striacosta albicosta]) using regression analyses. Regional spatial clustering in the abundances of key pests with members of the community was explored using Moran's I test statistic. The distributions of rootworms and European corn borer were mapped. A total of 37 185 arthropods representing at least 91 taxa were collected in South Dakota maize; there was an average of 5.06 predators and 8.29 herbivores found per plant. Key pests were never found at economically threatening levels (with one exception for Diabrotica). Numerous species were consistently numerically associated with each of the key pests across the farms during anthesis. Occasionally, these pests shared species with which they were locally associated with; for example, coccinellid egg abundances were predictive of the abundances of all key pest species except rootworm adults. Spatial analysis across the region suggested that species co-occurred with key pests based on local characteristics surrounding the fields, rather than as a result of regional characteristics. Exceptions were documented; namely aphids and Western bean cutworms that spatially clustered with a handful of other members of the community. The results of the study point out that the abundances of key pests of maize were interconnected through indirect associations in the abundances of other members of the community. These associations may be useful for manipulating maize agroecosystems to minimize the effects of maize pests.

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“…Broad-spectrum insecticides applied as seed treatments, directly to the soil, and for adult rootworm control pose environmental and human health concerns, and rootworms have developed resistance to some of these chemicals van Rosen and Ester 2010). Crop rotation is challenged by the proliferation of rotation-resistant rootworm strains (Krysan et al 1984;Levine et al 2002;Schroeder et al 2005) and the widespread planting of continuous corn driven by high maize prices. Non-transgenic hybrids are desirable for use in certain situations, including refuges required for insect resistance management, organic fields, and when producers are hesitant or unable to use genetically modified organisms.…”

Section: Introductionmentioning

confidence: 99%

Generalist-feeding subterranean mites as potential biological control agents of immature corn rootworms

et al. 2011

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Predatory mites are important components of subterranean food webs and may help regulate densities of agricultural pests, including western corn rootworms (Chrysomelidae: Diabrotica virgifera virgifera). Implementing conservation and/or classical biocontrol tactics could enhance densities of specialist or generalist predatory mites and lead to pest suppression, but first relevant mite species must be identified and their predatory capabilities evaluated. We conducted lab assays to quantify consumption of immature rootworms and oviposition rates of various mite species. Our study indicates that rootworms are a sub-optimal food source for the mite taxa tested. However, all mite species fed upon rootworms to some degree, although consumption by nematophagous Eviphis ostrinus was extremely low. Predators consumed more rootworm larvae than eggs, and mite size was correlated with prey consumption, with larger predators eating more prey. Four mite taxa (Gaeolaelaps sp., S. miles, Gl. americana, and G. aculeifer) had detrimental effects on survival of rootworm larvae, and the latter two species also had negative impacts on densities of pest eggs. Although it is unlikely that any of these mite species by itself has a major impact on rootworm control, the community of generalist soil-dwelling mites may play an important role in regulating immature rootworm populations in the field.

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Effect of Four Cropping Systems on Variant Western Corn Rootworm (Coleoptera: Chrysomelidae) Adult and Egg Densities and Subsequent Larval Injury in Rotated Maize

Cited by 21 publications

References 19 publications

Oviposition Behaviors in Relation to Rotation Resistance in the Western Corn Rootworm

Oviposition Behaviors in Relation to Rotation Resistance in the Western Corn Rootworm

Spatial and numerical relationships of arthropod communities associated with key pests of maize

Generalist-feeding subterranean mites as potential biological control agents of immature corn rootworms

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