Temporal relationships betweenZea mays,ostrinia nubilalis (Lep.: Pyralidae) and endophyticBeauveria bassiana |
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Authors: | Lori Anderson Bing Leslie C. Lewis |
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Affiliation: | (1) Present address: Science Department, Roosevelt High School, 4419 Center Street, 50312 Des Moines, IA, USA;(2) Department of Entomology, Iowa State University, 50011 Ames, IA, USA;(3) USDA/ARS Corn Insects Research Unit, R. R. 3, Box 45B, 50021 Ankeny, IA, USA |
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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. The mention of firm names or trade products does not imply that they are endorsed or recommended by the U.S. Department of Agriculture over other firms or similar products not mentioned. |
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Keywords: | Beauveria bassiana Ostrinia nubilalis endophytic relationship biological control insect pathology Zea mays |
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