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Importance of the gram pod borer and earhead bug on sorghum

  • N. Natarajan (a1) and P. C. Sundara Babu (a1)

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.

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.

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Dhandapani, N. and Balasubramanian, M. (1981) Growth of population of Heliothis armigera (Hbn) on maize and sorghum. Indian J. Ecol. 8, 6064.
Natarajan, N. (1985) EBioecology and insecticidal control of sorghum earhead bug, Calocoris angustatus Lethierry. Ph.D. thesis, Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, India.
Natarajan, N. and Sundara, Babu P. C. (1988a) Damage potential of earhead bug on sorghum panicle. Insect Sci. Applic. 9, 411414.
Natarajan, N. and Sundara, Babu P. C. (1988b) Economic injury level for sorghum earhead bug Calocoris angustatus Lethierry in Southern India. Insect Sci. Applic. 9, 395398.
Natarajan, N., Sundara, Babu P. C. and Chelliah, S. (1989) Seasonal occurrence of sorghum earhead bug, Calocoris angustatus Lethierry (Hemiptera: Miridae) in southern India. Trop. Pest Manage. 35, 7077.
Sharma, H. C. (1985) Strategies for pest control in sorghum in India. Trop. Pest Manage. 31, 167185.
Twine, P. H., Kay, I. R. and Lloyd, R. J. (1983) Heliothis in sorghum. Queensl. Agric. J. 4, 185188.

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