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International Journal of Tropical Insect Science

, Volume 11, Issue 6, pp 851–854 | Cite as

Importance of the Gram Pod Borer and Earhead Bug on Sorghum

  • N. Natarajan
  • P. C. Sundara Babu
Research Article

Abstract

The importance of the gram pod borer, Helicoverpa (=Heliothis) armigera (Hübner) and the earhead bug, Calocoris angustatus Lethierry in the sorghum panicle was assessed. Gram pod borer consumed 2.364 g of dough stage grains from fourth instar to pupation. A total of 74.50 grains were damaged during the complete larval period. Grain loss was 14.32 and 29.42 g respectively when 50 and 100 nymphs per panicle were confined. When the two species occurred together grain loss was more than the sum of the loss due to each species alone.

Key Words

Gram pod borer Helicoverpa (=Heliothis) armigera sorghum earhead bug Calocoris angustatus damage potential 

Résumé

Le dommage que causent l’insecte térébrant des cosses, Helicoverpa (=Heliothis) armigera (Hübner) et la punaise des épis, Calocoris angustatus dans les panicules de sorgho a été évalué. L’insecte térébrant a consommé 2,364 g de graines en maturation à partir de la quatrième phase de son développement jusqu’à l’état chrysalide. Un total de 74,50 graines a été détruit pendant la période des métamorphoses. La perte de graines s’élevait à 14,32 et 29,42 g respectivement quand 50 ou 100 nymphes se concentraient dans une panicule. Quand les deux espèces se trouvaient ensemble dans une même panicule, la perte de graines était plus grande que celle due à chaque espèce séparée.

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References

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Copyright information

© ICIPE 1990

Authors and Affiliations

  • N. Natarajan
    • 1
  • P. C. Sundara Babu
    • 1
  1. 1.Department of Agricultural EntomologyTamil Nadu Agricultural UniversityCoimbatoreIndia

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