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Use of Elcar® to Reduce the Number of Corn Earworms (Lepidoptera: Noctuidae) Developing in Field Corn

J. J. Hamm, J. R. Raulston, J. Lorea, A. N. Sparks and J. E. Houghtaling
The Florida Entomologist
Vol. 69, No. 2 (Jun., 1986), pp. 383-390
DOI: 10.2307/3494942
Stable URL: http://www.jstor.org/stable/3494942
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Use of Elcar® to Reduce the Number of Corn Earworms (Lepidoptera: Noctuidae) Developing in Field Corn
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Abstract

A single application of Elcar®, a commercial formulation of the Heliothis nuclear polyhedrosis virus, at the rate of 272 gm/ha, was made by airplane to two fields of hybrid corn in the early silking stage in northeastern Mexico. Elcar produced a greater reduction in number of corn earworm, Heliothis zea (Boddie), larvae on the hybrid with a tight husk extension than on the hybrid with a loose husk. There was no reduction in number of pupae produced on the hybrid with the loose husk. Although the 30% reduction in number of corn earworm pupae produced on the hybrid with the tight husk extension was not statistically significant, it closely paralleled the reduction in larvae which was statistically significant. The Elcar treatment saved more kernels of corn on the hybrid with the loose husk than on the hybrid with the tight husk because the damage to the untreated hybrid with the loose husk was much greater than to the untreated hybrid with the tight husk. /// Una aplicación de Elcar®, una formulación comercial del virus nuclear polihedrosis de Heliothis, a razón de 272 gm/ha, fue hecha por avión temprano en la etapa floral de maíz híbrido en dos campos en el noreste de Mexico. Elcar produjo una mayor reducción en el número de larvas de Heliothis zea en el híbrido con extensiones de vainas apretadas que en híbridos con una vaina suelta. No se redujo el número de pupas producidas en el híbrido con la vaina suelta. Aunque una reducción de un 30% en el número de pupas de H. zea producidas en el híbrido con la extensión de la vaina apretada no fue estadisticamente significante, es bastante paralela a la reducción de larvas que eran estadisticamente significante. El tratamiento de Elcar® salvó a más granos de maíz en el híbrido con la vaina suelta que en los híbridos con la vaina apretada porque el daño al híbrido no-tratado con la vaina suelta fue mucho mayor que el del híbrido no-tratado con la vaina apretada.

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