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Importance of the gram pod borer and earhead bug on sorghum

Published online by Cambridge University Press:  19 September 2011

N. Natarajan  and
P. C. Sundara Babu
N. Natarajan
Affiliation:
Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore - 641 003, India
P. C. Sundara Babu
Affiliation:
Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore - 641 003, India
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Abstract

The importance of the gram pod borer, Helicoverpa (=Heliothis) armigera (Hiibner) 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.

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 léetat chrysalide. Un total de 74, 50 graines a été détruit pendant la période des métamorphoses. La perte de graines s'elevait 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.

Keywords

Gram pod borerHelicoverpa (=Heliothis) armigerasorghum earhead bugCalocoris angustatusdamage potential
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 11 , Issue 6 , December 1990 , pp. 851 - 854
Copyright
Copyright © ICIPE 1990

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References

REFERENCES

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