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Entomophaga

, Volume 23, Issue 1, pp 83–88 | Cite as

Foliar application ofNosema pyrausta for suppression of populations of European corn borer

  • L. C. Lewis
  • R. E. Lynch
Article

Abstract

In 1974, an application of the microsporidan,Nosema pyrausta (Paillot, 1927)Kotlan, 1928, with a back-pack type sprayer (22.5×107 spores/plant) to whorl stage maize infested with European corn borers,Ostrinia nubilalis (Hübner) reduced the number of larvae/plant by 48.1% and produced an infection of 15.3×104 spores/mg of larval weight in 62.1% of the collected larvae. In 1975, applications of 24.3×107 spores/plant to similar maize, in 2 separate tests, reduced the number of larvae/plant by 18.8 and 43.8% and caused an infection of 14.3 and 19.1×104 spores/mg of larval weight in 65.9 and 63.3% of the collected larvae. Also, in 1975, applications of 24.3×107 spores/plant to pollen shedding maize in 2 separate tests reduced the number of larvae/plant by 17.2 and 14.1% and caused an infection of 24.3 and 27.2×104 spores/mg of larval weight in 99.2 and 95.2% of the collected larvae.

Keywords

Plant Pathology Foliar Application Separate Test European Corn Borer Larval Weight 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

La microsporidie,Nosema pyrausta (Paillot, 1927;Kotlan, 1928) a été appliquée avec un pulvérisateur à dos, sur du maïs à la phase du verticille et sur du maïs émettant le pollen, attaqués par la pyrale du maïs sansNosema. Ces 2 stades de croissance du maïs correspondent à la 1re et à la 2e génération de la pyrale du maïs,Ostrinia nubilalis dans l'Iowa.

Une suspension aqueuse de spores deN. pyrausta a été appliquée sur le verticille de la plante pour des essais sur la 1re génération et aux 3 nœuds au-dessus et au-dessous de l'épi pour les essais sur la 2e génération. En 1974 (1re génération),N. pyrausta a abaissé le nombre de larves par plante de 48,1% et a causé une infection de 15,3×104 spores/mg de larve chez 62,1% des insectes récoltés. En 1975 (1re génération),N. pyrausta a abaissé le nombre de larves par plante de 18,8% et 43,8% dans 2 essais et a causé une infection de 24,3 et 27,2×104 spores/mg de larve chez 65,9% et 63,3% des larves récoltées. En 1975 (2e génération),N. pyrausta a abaissé le nombre de larves par plante de 17,2% et 14,1% dans 2 essais et a causé une infection de 24,3 et 27,2×104 spores/mg de larve chez 99,2% et 95,2% des insectes collectés. L'impact de cette application sur les populations de pyrale ultérieures est discuté.

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References

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Copyright information

© Le François 1978

Authors and Affiliations

  • L. C. Lewis
    • 1
  • R. E. Lynch
    • 1
  1. 1.A.R.S., Corn Insects Research UnitU.S.D.A.AnkenyUSA

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