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Temporal relationships betweenZea mays, ostrinia nubilalis (Lep.: Pyralidae) and endophyticBeauveria bassiana

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Abstract

The entomopathogenic fungus,Beauveria bassiana (Balsamo) Vuillemin, was applied to whorl-stage (V7) corn,Zea mays L., by foliar application of a granular formulation of corn grits containing conidia or by injection of a conidial suspension. All plants were infested with European corn borer larvae,Ostrinia nubilalis (Hübner), at the V7 (whorl), V12 (late-whorl), or V17 (pretassel) stage of plant development. Plants infested at whorl and late-whorl stages had significantly more European corn borer tunneling than did plants infested at the pretassel stage. The percentage of plants colonized byB. bassiana did not differ significantly among the whorl, late-whorl, and pretassel stages. As the plants matured,B. bassiana was isolated from different plant areas, with the pith more frequently colonized than the leaf collars. Foliar application ofB. bassiana provided immediate suppression ofO. nubilalis in those plants infested at whorl stage. The reduced efficacy ofB. bassiana at the intermediate plant stages relative to efficacy at harvest is discussed.

Résumé

Le champignon entomopathogène,Beauveria bassiana (Balsamo) Vuillemin a été épandu sur maïs, au stade cornet (V7) par application foliaire d'une formulation granulée de grits de maïs contenant des conidies ou par injection d'une suspension de conidies. Toutes les plantes ont été infestées à l'aide de larves de la Pyrale du maïs,Ostrinia nubilalis, au stade V7 (cornet), V12 (fin de stade cornet), ou V17 (apparition de la panicule). Les plantes infestées au stade cornet et à la fin du stade cornet ont eu significativement plus de chenilles de Pyrale en train de miner que les plantes infestées au stade début de panicule mâle. Le pourcentage de plantes infestées parB. bassiana n'était pas significativement différent entre ces 3 stades phénologiques. Au fur et à mesure que les plantes se développaient,B. bassiana était isolé de différentes parties de la plante, la moelle étant plus souvent infestée que les ligules. Les applications foliaires deB. bassiana ont entraîné la destruction immédiate de la pyrale chez les plantes infestées au stade cornet. La baisse de l'efficacité deB. bassiana aux stades intermédiaires par comparaison avec son efficacité au moment de la récolte est discutée.

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Author notes

  1. Lori Anderson Bing & Leslie C. Lewis

    Present address: Science Department, Roosevelt High School, 4419 Center Street, 50312, Des Moines, IA, USA

Authors and Affiliations

  1. Department of Entomology, Iowa State University, 50011, Ames, IA, USA

    Lori Anderson Bing

  2. USDA/ARS Corn Insects Research Unit, R. R. 3, Box 45B, 50021, Ankeny, IA, USA

    Leslie C. Lewis

Authors
  1. Lori Anderson Bing
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  2. Leslie C. Lewis
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Anderson Bing, L., Lewis, L.C. Temporal relationships betweenZea mays, ostrinia nubilalis (Lep.: Pyralidae) and endophyticBeauveria bassiana . Entomophaga 37, 525–536 (1992). https://doi.org/10.1007/BF02372322

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