Ecological Studies of the European Corn Borer (Lepidoptera: Pyralidae) in Boone County, Iowa

Jarvis, J. L.; Guthrie, W. D.

doi:10.1093/ee/16.1.50

Cited by 32 publications

(16 citation statements)

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“…Total egg predation averaged Ϸ5% in sweet corn and 10% in Þeld corn and was not signiÞcantly different between T. ostriniae release and nonrelease plots. Egg predation rates observed in our study were comparable to those reported by Bartholomai (1954) in Indiana (12%) and by Jarvis and Guthrie (1987) in Iowa (1Ð 8%).…”

Section: Resultssupporting

confidence: 88%

Life Table Studies of European Corn Borer (Lepidoptera: Crambidae) with and without Inoculative Releases ofTrichogramma ostriniae(Hymenoptera: Trichogrammatidae)

et al. 2002

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Section: Resultssupporting

confidence: 88%

Life Table Studies of European Corn Borer (Lepidoptera: Crambidae) with and without Inoculative Releases ofTrichogramma ostriniae(Hymenoptera: Trichogrammatidae)

et al. 2002

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“…(Heteroptera: Anthocoridae), and predatory mites, including Amblyseius spp. All these predators occur naturally in maize fields (Hadam et al, 1986;Jarvis & Guthrie, 1987;Coll & Bottrell, 1991;Ayyappath et al, 1996;Iraola et al, 1997;Orr & Landis, 1997;Schmitz & Bartsch, 2001;Wold et al, 2001). These predators are used as biological control agents against thrips and are therefore commercially available (Gillespie, 1989;van Houten et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Effects of Bt maize on Frankliniella tenuicornis and exposure of thrips predators to prey‐mediated Bt toxin

Obrist

Klein

Dutton

et al. 2005

Entomologia Exp Applicata

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As a part of a risk assessment procedure, the impact of Bt maize expressing Cry1Ab toxin on the thrips Frankliniella tenuicornis (Uzel) (Thysanoptera: Thripidae) was investigated, and the potential risks for predators feeding on thrips on Bt maize were evaluated. The effects of Bt maize on F. tenuicornis were assessed by measuring life-table parameters when reared on Bt and non-Bt maize. The content of Cry1Ab toxin in different stages of F. tenuicornis reared on Bt maize and the persistence of the toxin in adults where determined in order to evaluate the possible exposure of predators when feeding on thrips. In addition, Chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae) was used as a model predator to assess how the behaviour of prey and predator may influence the exposure of a natural enemy to the Bt toxin. Life-table parameter results showed that F. tenuicornis was not affected when it was reared on Bt maize. This indicates that the potential for prey quality-mediated effects on predators is low. Bt content was highest in thrips larvae and adults, and negligible in the non-feeding prepupal and pupal stages. The persistence of the Cry1Ab toxin in adult F. tenuicornis was short, resulting in a decrease of 97% within the first 24 h. Predation success by young C. carnea larvae varied among the thrips stages, indicating that exposure of predators to Bt toxin can additionally depend on the prey stage. When combining the current knowledge of the susceptibility of major thrips predators with our findings showing no potential for prey quality-mediated effects, relatively low toxin content in thrips as well as short persistence, it can be concluded that the risks for predators when feeding on thrips in or next to Bt maize fields are negligible.

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“…e L. concina, naquelas condições, foi significativamente mais alta (Tabela 4). Já foi demonstrado que Orius pode ter um grande impacto nas populações de lepidópteros-pragas, como, por exemplo, O. nubilalis (Jarvis & Guthrie, 1987). A interação entre o manejo do solo e culturas não foi significativa quanto ao número de espécies e indivíduos de Hymenoptera (Tabela 5) e número de parasitóides de famílias de Hymenoptera (Tabela 6) em relação às culturas do milho e da soja.…”

Section: Insetounclassified

Efeitos do plantio direto e da consorciação soja-milho sobre inimigos naturais e pragas

Cividanes

Barbosa

2001

Pesq. agropec. bras.

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Resumo -Procurou-se avaliar os efeitos do plantio direto e da consorciação soja (Glycine max (L.) Merrill) e milho (Zea mays L.) sobre pragas e inimigos naturais. Os tratamentos constituíram um fatorial 3 x 2 (monocultura de soja, monocultura de milho, consorciação soja-milho x plantio direto, plantio convencional), em blocos casualizados. Os insetos foram amostrados pelo método do pano, rede entomológica, procura visual e armadilha de sucção. Entre os insetos-pragas do milho, Maecolaspis assimilis ocorreu em maior número no sistema de plantio convencional; o mesmo ocorreu com os predadores Cycloneda sanguinea e Doru sp. Por outro lado, M. assimilis e o predador Toxomerus sp. foram mais numerosos na monocultura de milho em relação à cultura do milho consorciado com soja. Dos insetos-pragas da soja, destacaram-se pelo maior número Anticarsia gemmatalis e Diabrotica gracilenta, no sistema de plantio convencional, e o mesmo aconteceu com a espécie da família Trichogrammatidae, enquanto as espécies da família Eulophidae foram mais numerosas na soja sob sistema de plantio direto. Na soja consorciada com milho foi maior o número de insetos-pragas Megalotomus sp. e Maecolaspis sp. e dos inimigos naturais Geocoris sp., Lebia concina, Orius sp., Braconidae e Scelionidae.Termos para indexação: Glycine max, Zea mays, insetos, controle de pragas. Effects of no-tillage and of soybean-corn intercropping on natural enemies and pestsAbstract -This study evaluated the effects of no-tillage and of strip intercropping of soybean (Glycine max (L.) Merrill) and corn (Zea mays L.) on the abundance of pests and natural enemies. The plots were arranged in a randomized complete block design for a 3 x 2 factorial experiment (soybean monoculture, corn monoculture, strip intercropping of soybean-corn x no-tillage and conventional tillage). Insects were sampled by sweep net, ground cloth, visual search and suction net. Among the corn insect pests, Maecolaspis assimilis occurred in highest number in the no-tillage system, the same being observed with the predators Cycloneda sanguinea and Doru sp. On the other hand, M. assimilis and the predator Toxomerus sp. were more abundant in corn monoculture than in corn of the strip-intercropping system. Considering the soybean insect pests, highest number of Anticarsia gemmatalis and Diabrotica gracilenta was found in the conventional tillage system; the same happened to the Trichogrammatidae species, while species of Eulophidae family were more numerous in soybean under no-tillage system. Soybean of the strip-intercropping system showed highest abundance of the insect pests Megalotomus sp. and Maecolaspis sp. and the natural enemies Geocoris sp., Lebia concina, Orius sp., Braconidae and Scelionidae.

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Ecological Studies of the European Corn Borer (Lepidoptera: Pyralidae) in Boone County, Iowa

Cited by 32 publications

References 0 publications

Life Table Studies of European Corn Borer (Lepidoptera: Crambidae) with and without Inoculative Releases ofTrichogramma ostriniae(Hymenoptera: Trichogrammatidae)

Life Table Studies of European Corn Borer (Lepidoptera: Crambidae) with and without Inoculative Releases ofTrichogramma ostriniae(Hymenoptera: Trichogrammatidae)

Effects of Bt maize on Frankliniella tenuicornis and exposure of thrips predators to prey‐mediated Bt toxin

Efeitos do plantio direto e da consorciação soja-milho sobre inimigos naturais e pragas

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